subject:(Cathode)

Penn State University

1. Stager, Jennifer L. Impact of Anode-separator Configurations and Cathode Materials on Microbial Fuel Cell Performance.

Degree: 2015, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/26687

► Microbial fuel cells (MFCs) have been shown to simultaneously treat wastewater and generate electricity. Scaling up MFCs will require compact and efficient reactor designs, stable… (more)

▼ Microbial fuel cells (MFCs) have been shown to simultaneously treat wastewater and generate electricity. Scaling up MFCs will require compact and efficient reactor designs, stable performance, inexpensive electrode materials, and high power production using domestic wastewater. In this study, small graphite fiber brush anodes were used in larger-scale MFCs to determine if stable anode potentials and high power production could be achieved when using domestic wastewater in fed batch and continuous flow modes. Additionally, a new activated carbon cathode material incorporating nitrogen and phosphorus was tested in cube MFCs to determine if power generation would be higher compared to other activated carbon cathode materials when using a phase inversion process to produce these cathodes. Small diameter graphite brush anodes were examined using three different cathode configurations: a platinum catalyst on carbon cloth without a separator (Pt-NS); a platinum catalyst on carbon cloth with polyvinyl alcohol (PVA) (Pt-PVA) separator; and an activated carbon cathode with cloth separator (AC-CS). The Pt-NS and Pt-PVA configurations achieved similar maximum power densities in batch mode, but the Pt-NS had a lower maximum power density in continuous flow mode. Long-term operation using wastewater and the Pt-NS cathode resulted in erratic anode performance based on power generation in continuous flow mode, likely as a result of oxygen contamination of the anodes. The use of a PVA separator to reduce oxygen crossover into the anode chamber did not stabilize performance. An AC-CS cathode was then examined as a method to restore anode performance, but this cathode produced only half the maximum power density obtained with the Pt-NS or Pt-PVA MFCS operated in fed batch mode. It was hypothesized that the poor stability in performance of the MFC was due to low wastewater strength. Therefore, the wastewater was amended with 1 g/L sodium acetate and operated using the AC-CS cathode in continuous flow mode. The use of the acetate amended wastewater resulted in stable operation and reproducible performance between replicate reactors. The anodes had a high negative potential and polarization data did not show signs of power overshoot. This indicates that the graphite fiber brush anodes will perform better under high COD conditions. An alternative cathode material was examined in separate tests using smaller cube type MFCs to determine if incorporating nitrogen and phosphorus into the activated carbon material would improve performance, as reported by others by a press process, when cathodes were instead constructed using a phase inversion process. After immersing cellulose in an ammonium phosphate solution, allowing it to air dry, and then heating in a nitrogen atmosphere at 5°C/min to 900°C, this material was then used to make a cathode by a phase inversion process. The power performance achieved with this dual doped cellulose-derived activated carbon cathode (cellulose N+P) was compared to a plain, self-manufactured cellulose activated… Advisors/Committee Members: Bruce Ernest Logan, Thesis Advisor/Co-Advisor.

Subjects/Keywords: Microbial Fuel Cell; Anode; Cathode

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Stager, J. L. (2015). Impact of Anode-separator Configurations and Cathode Materials on Microbial Fuel Cell Performance. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/26687

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Stager, Jennifer L. “Impact of Anode-separator Configurations and Cathode Materials on Microbial Fuel Cell Performance.” 2015. Thesis, Penn State University. Accessed March 04, 2021. https://submit-etda.libraries.psu.edu/catalog/26687.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Stager, Jennifer L. “Impact of Anode-separator Configurations and Cathode Materials on Microbial Fuel Cell Performance.” 2015. Web. 04 Mar 2021.

Vancouver:

Stager JL. Impact of Anode-separator Configurations and Cathode Materials on Microbial Fuel Cell Performance. [Internet] [Thesis]. Penn State University; 2015. [cited 2021 Mar 04]. Available from: https://submit-etda.libraries.psu.edu/catalog/26687.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Stager JL. Impact of Anode-separator Configurations and Cathode Materials on Microbial Fuel Cell Performance. [Thesis]. Penn State University; 2015. Available from: https://submit-etda.libraries.psu.edu/catalog/26687

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Wollongong

2. Gao, Xuanwen. Development of novel materials for rechargeable lithium batteries.

Degree: Doctor of Philosophy, 2014, University of Wollongong

URL: 030304 Physical Chemistry of Materials ; https://ro.uow.edu.au/theses/4364

► In the field of electrical energy storage, lithium ion batteries (LIBs) are considered as one of the most promising technologies due to their particularly… (more)

▼ In the field of electrical energy storage, lithium ion batteries (LIBs) are considered as one of the most promising technologies due to their particularly higher energy density and longer shelf life, as well as they do not suffer from the serious memory effect problems that afflict Ni-MH batteries. Graphite and LiCoO₂ are currently the most common commercial anode and cathode materials for the LIB, but they still suffer from low theoretical capacities of 372 mAh g^-1 and 170 mAh g^-1, respectively. Such low discharge capacity would be unable to satisfy the growing demand for large-scale potential lithium ion battery applications, such as electric vehicles (EVs), hybrid electric vehicles (HEVs), and stationary energy storage for solar and wind electrical energy generation. Therefore, the electrical performance of active electrode materials in rechargeable lithium ion batteries must continue to be improved. In this doctoral work, several promising materials for both anode and cathode electrodes were synthesized and combined with conductive polymer to further improve their electrochemical performance. These include LiV₃O₈-polyaniline, Germaniumpolypyrrole, and LiNi_0.5Mn_1.5O₄-polypyrrole composites. Monodisperse porous Ni_0.5Zn_0.5Fe₂O₄ nanospheres are also successfully synthesized by the solvothermal method and their electrical performances as novel anode materials for LIB are investigated in detailed. In addition, another key aspect for the electrochemical performance of LIB is the stability of the electrolyte. The most widely used electrolyte for lithium ion batteries is LiPF₆ dissolved in ethylene carbonate (EC), dimethyl carbonate (DMC) and diethyl carbonate (DEC). The battery performance may be limited, however, by the highly oxidizing conditions at high voltage (> 4.5 V). Herein, room temperature ionic liquid was used as a new type of electrolyte for the high-voltage cathode material LiNi_0.5Mn_1.5O₄, and the relationship between the electrolyte characteristics and the performance of Li/LiNi_0.5Mn_1.5O₄ cells at the high potential of 5.1 V was studied in more detail. Anode materials for the LIBs Nano-Germanium/polypyrrole composite has been synthesized by a simpe chemical reduction method in aqueous solution. The Ge nanoparticles were directly coated on the surface of the…

Subjects/Keywords: Lithium battery; cathode; anode; electrolyte

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gao, X. (2014). Development of novel materials for rechargeable lithium batteries. (Doctoral Dissertation). University of Wollongong. Retrieved from 030304 Physical Chemistry of Materials ; https://ro.uow.edu.au/theses/4364

Chicago Manual of Style (16^th Edition):

Gao, Xuanwen. “Development of novel materials for rechargeable lithium batteries.” 2014. Doctoral Dissertation, University of Wollongong. Accessed March 04, 2021. 030304 Physical Chemistry of Materials ; https://ro.uow.edu.au/theses/4364.

MLA Handbook (7^th Edition):

Gao, Xuanwen. “Development of novel materials for rechargeable lithium batteries.” 2014. Web. 04 Mar 2021.

Vancouver:

Gao X. Development of novel materials for rechargeable lithium batteries. [Internet] [Doctoral dissertation]. University of Wollongong; 2014. [cited 2021 Mar 04]. Available from: 030304 Physical Chemistry of Materials ; https://ro.uow.edu.au/theses/4364.

Council of Science Editors:

Gao X. Development of novel materials for rechargeable lithium batteries. [Doctoral Dissertation]. University of Wollongong; 2014. Available from: 030304 Physical Chemistry of Materials ; https://ro.uow.edu.au/theses/4364

Colorado State University

3. Rand, Lauren Paula. Calcium aluminate electride hollow cathode, A.

Degree: PhD, Mechanical Engineering, 2014, Colorado State University

URL: http://hdl.handle.net/10217/82521

► The development and testing of a hollow cathode utilizing C12A7 (12CaO.Al2O3) electride as an insert are presented. Hollow cathodes are an integral part of electric… (more)

Subjects/Keywords: electride; hollow cathode; electron emission

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rand, L. P. (2014). Calcium aluminate electride hollow cathode, A. (Doctoral Dissertation). Colorado State University. Retrieved from http://hdl.handle.net/10217/82521

Chicago Manual of Style (16^th Edition):

Rand, Lauren Paula. “Calcium aluminate electride hollow cathode, A.” 2014. Doctoral Dissertation, Colorado State University. Accessed March 04, 2021. http://hdl.handle.net/10217/82521.

MLA Handbook (7^th Edition):

Rand, Lauren Paula. “Calcium aluminate electride hollow cathode, A.” 2014. Web. 04 Mar 2021.

Vancouver:

Rand LP. Calcium aluminate electride hollow cathode, A. [Internet] [Doctoral dissertation]. Colorado State University; 2014. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/10217/82521.

Council of Science Editors:

Rand LP. Calcium aluminate electride hollow cathode, A. [Doctoral Dissertation]. Colorado State University; 2014. Available from: http://hdl.handle.net/10217/82521

4. Heath, Jenny. Beyond lithium : atomic-scale insights into cathode materials for sodium and magnesium rechargeable batteries.

Degree: PhD, 2018, University of Bath

URL: https://researchportal.bath.ac.uk/en/studentthesis/beyond-lithium-atomicscale-insights-into-cathode-materials-for-sodium-and-magnesium-rechargeable-batteries(f07f3bae-eec5-4314-9246-70ce89d1432c).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.761000

► The importance of energy storage worldwide is increasing with the use of renewable energy sources and electric vehicles. With the intermittent nature of wind and… (more)

▼ The importance of energy storage worldwide is increasing with the use of renewable energy sources and electric vehicles. With the intermittent nature of wind and solar power, large-scale grid storage is an extremely important progression needed to reduce the use of fossil fuels. For this to become a reality, rechargeable batteries beyond existing Li-ion technologies need consideration. The development of such batteries requires improvement of understanding their component materials. Modern computer modelling techniques enable valuable insights into the fundamental defect, ion transport and voltage properties of battery materials at the atomic level. Atomistic simulation and ab initio density functional theory (DFT) techniques have been used to study a number of potential cathode materials for Na-ion and Mg batteries. Firstly, the olivine and maricite forms of NaFePO4 are considered in terms of their defect formation energies and Na ion diffusion. The atomistic study indicates that anti-site disorder is the most favourable type of intrinsic defect. The activation energies for Na-ion migration in the olivine and maricite materials are 0.4 eV and 1.6 – 1.8 eV respectively. Moreover, molecular dynamics (MD) studies reveal that there is only substantial Na-ion diffusion in the olivine structure, with diffusion coefficients (DNa) at 300 K of 7 x 10−13 cm2s−1 for maricite and 4 x 10−9 cm2s−1 for olivine NaFePO4. The presence of anti-site defects is shown to decrease Na+ diffusion within the olivine structure, which is of relevance to its rate behaviour. Secondly, the effect of lattice strain on ion transport and defect formation in olivine-type LiFePO4 and NaFePO4 is investigated as a means to enhance their ion conduction properties. It is predicted that lattice strain can have a remarkable effect on the rate performance of olivine cathode materials, with a major increase in ionic conductivity and decrease in blocking defectsat room temperature. Thirdly, DFT techniques have been used to examinesurface and grain boundary formation in P2-NaCoO2. The coordination lossexperienced by ions present at surfaces is found to influence the resultingsurface energy. Layered oxide cathode materials were further investigated byconsidering the effect of Mg2+ doping on P2-Na2 [Ni1 Mn2 ]O2. Na vacancy 333formation energies decreased with 10% Mg2+ doping on the Ni site and an increase in Na diffusion was predicted with MD calculations. This positive effect on Na ion conductivity is caused by displacement of the Mg ions from the transition metal layer and the resulting change in electrostatic potential. Finally, Mg ion conduction, doping and voltage behaviour of MgFeSiO4 were studied. The Mg-ion migration activation energy is relatively low for an olivine-type silicate, and MD simulations predict a diffusion coefficient (DMg) of 10−9 cm2s−1, suggesting favourable electrode kinetics. Partial substitution of Fe by Co or Mn could increase the cell voltage from 2.3 V vs Mg/Mg2+ to 2.8 - 3.0 V.

Subjects/Keywords: 540; Battery; Cathode; Sodium; Magnesium

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Heath, J. (2018). Beyond lithium : atomic-scale insights into cathode materials for sodium and magnesium rechargeable batteries. (Doctoral Dissertation). University of Bath. Retrieved from https://researchportal.bath.ac.uk/en/studentthesis/beyond-lithium-atomicscale-insights-into-cathode-materials-for-sodium-and-magnesium-rechargeable-batteries(f07f3bae-eec5-4314-9246-70ce89d1432c).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.761000

Chicago Manual of Style (16^th Edition):

Heath, Jenny. “Beyond lithium : atomic-scale insights into cathode materials for sodium and magnesium rechargeable batteries.” 2018. Doctoral Dissertation, University of Bath. Accessed March 04, 2021. https://researchportal.bath.ac.uk/en/studentthesis/beyond-lithium-atomicscale-insights-into-cathode-materials-for-sodium-and-magnesium-rechargeable-batteries(f07f3bae-eec5-4314-9246-70ce89d1432c).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.761000.

MLA Handbook (7^th Edition):

Heath, Jenny. “Beyond lithium : atomic-scale insights into cathode materials for sodium and magnesium rechargeable batteries.” 2018. Web. 04 Mar 2021.

Vancouver:

Heath J. Beyond lithium : atomic-scale insights into cathode materials for sodium and magnesium rechargeable batteries. [Internet] [Doctoral dissertation]. University of Bath; 2018. [cited 2021 Mar 04]. Available from: https://researchportal.bath.ac.uk/en/studentthesis/beyond-lithium-atomicscale-insights-into-cathode-materials-for-sodium-and-magnesium-rechargeable-batteries(f07f3bae-eec5-4314-9246-70ce89d1432c).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.761000.

Council of Science Editors:

Heath J. Beyond lithium : atomic-scale insights into cathode materials for sodium and magnesium rechargeable batteries. [Doctoral Dissertation]. University of Bath; 2018. Available from: https://researchportal.bath.ac.uk/en/studentthesis/beyond-lithium-atomicscale-insights-into-cathode-materials-for-sodium-and-magnesium-rechargeable-batteries(f07f3bae-eec5-4314-9246-70ce89d1432c).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.761000

University of Illinois – Urbana-Champaign

5. Petronico, Aaron. Organic materials for the improvement and understanding of electrochemical devices.

Degree: PhD, Chemistry, 2018, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/102782

► The contents of this thesis focus on how organic materials can be applied to improve Li+ based batteries. There is specific focus mostly on cathode… (more)

Subjects/Keywords: Battery; Cathode; Organic; Electrochemistry

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Petronico, A. (2018). Organic materials for the improvement and understanding of electrochemical devices. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/102782

Chicago Manual of Style (16^th Edition):

Petronico, Aaron. “Organic materials for the improvement and understanding of electrochemical devices.” 2018. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed March 04, 2021. http://hdl.handle.net/2142/102782.

MLA Handbook (7^th Edition):

Petronico, Aaron. “Organic materials for the improvement and understanding of electrochemical devices.” 2018. Web. 04 Mar 2021.

Vancouver:

Petronico A. Organic materials for the improvement and understanding of electrochemical devices. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2018. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/2142/102782.

Council of Science Editors:

Petronico A. Organic materials for the improvement and understanding of electrochemical devices. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2018. Available from: http://hdl.handle.net/2142/102782

Princeton University

6. Taunay, Pierre-Yves. Scaling Laws in Orificed Thermionic Hollow Cathodes .

Degree: PhD, 2020, Princeton University

URL: http://arks.princeton.edu/ark:/88435/dsp012r36v159z

► Scaling laws for the total pressure, attachment length, and electron temperature within thermionic orificed hollow cathodes, an essential source of electrons for industrial and scientific… (more)

▼ Scaling laws for the total pressure, attachment length, and electron temperature within thermionic orificed hollow cathodes, an essential source of electrons for industrial and scientific applications, are developed. Total pressure, electron temperature, and attachment length are critical as they control the operational life of thermionic hollow cathode inserts, and, therefore, of the hollow cathode. The scaling laws are derived from first principles for the total pressure, and from a semi-analytical approach for the electron temperature and attachment length. The model presented herein addresses critical issues of past, zero-dimensional models that are reviewed in this work. The model, which combines a zero-dimensional approach to the conservation of energy and momentum for the combined plasma-neutral fluid and a charge-exchange-limited ambipolar diffusion model, allows for the computation of all plasma quantities, including the total fluid pressure. The assumptions on which the model relies are partially informed by an empirical analysis of the total pressure. The model depends on the operating conditions (discharge current and mass flow rate), cathode geometry, and the gas species, along with two non-controllable parameters: the neutral gas temperature and the sheath potential. Total pressure data at up to 300 A of cathode discharge current was obtained experimentally and was used, along with data from the literature, to verify the model. Good agreement is obtained for all quantities. The total pressure is found to scale both with the square of the mass flow rate multiplied by a weak function of discharge current, and with the square of the discharge current. This scaling can be physically interpreted as due to the relative importance of the magnetic pressure and the gasdynamic pressure. Both electron temperature and attachment length are found to vary inversely with the neutral gas pressure-cathode diameter product. The predicted emission length is found to be between 0.8-1.2 times the insert radius, to scale weakly with the pressure-diameter product, and to be nearly independent of the orifice diameter. The analysis suggests that the diffusion-dominated nature of the insert plasma can account for the scaling of the emission length. Cathode design rules are formulated based on the results of the analysis: insert length and radius should be similar to optimize the usage of the thermionic emitter, and the mass flow rate can be bounded such that the pressure-insert diameter product is close to the empirically determined value of 3.7 Torr-cm. Advisors/Committee Members: Choueiri, Edgar Y (advisor).

Subjects/Keywords: cathode; electric propulsion; hollow cathode; plasma physics; scaling law

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Taunay, P. (2020). Scaling Laws in Orificed Thermionic Hollow Cathodes . (Doctoral Dissertation). Princeton University. Retrieved from http://arks.princeton.edu/ark:/88435/dsp012r36v159z

Chicago Manual of Style (16^th Edition):

Taunay, Pierre-Yves. “Scaling Laws in Orificed Thermionic Hollow Cathodes .” 2020. Doctoral Dissertation, Princeton University. Accessed March 04, 2021. http://arks.princeton.edu/ark:/88435/dsp012r36v159z.

MLA Handbook (7^th Edition):

Taunay, Pierre-Yves. “Scaling Laws in Orificed Thermionic Hollow Cathodes .” 2020. Web. 04 Mar 2021.

Vancouver:

Taunay P. Scaling Laws in Orificed Thermionic Hollow Cathodes . [Internet] [Doctoral dissertation]. Princeton University; 2020. [cited 2021 Mar 04]. Available from: http://arks.princeton.edu/ark:/88435/dsp012r36v159z.

Council of Science Editors:

Taunay P. Scaling Laws in Orificed Thermionic Hollow Cathodes . [Doctoral Dissertation]. Princeton University; 2020. Available from: http://arks.princeton.edu/ark:/88435/dsp012r36v159z

7. Celasun, Yagmur. Synthèse et caractérisation de nouveaux matériaux d'électrode positive pour des applications Li-ion à haute énergie : Synthesis and characterization of new positive electrode materials for Li-ion high energy applications.

Degree: Docteur es, Matériaux, Mécanique, Génie civil, Electrochimie, 2020, Université Grenoble Alpes

URL: http://www.theses.fr/2020GRALI047

►

Cette thèse concerne le développement de rocksalts désordonnés surlithiés pour les systèmes Li-Ion à haute densité d’énergie. Dans un premier volet, les paramètres de synthèse… (more)

▼

Cette thèse concerne le développement de rocksalts désordonnés surlithiés pour les systèmes Li-Ion à haute densité d’énergie. Dans un premier volet, les paramètres de synthèse ont été optimisés pour améliorer les performances du rocksalt désordonné Li2.2NiTi0.2Nb0.6O4. Pour comprendre l’origine de sa forte irréversibilité au premier cycle, des analyses in situ structurales et électrochimiques avancées montrent un changement structural avec l’apparition d’un désordre durant la première charge. Ensuite, le rocksalt désordonné Li2TiS3 a été préparé selon notre procédé breveté. De nouvelles compositions avec une substitution au Sélénium, Li2TiSexS3-x, ont permis d’obtenir de fortes capacités de décharge à des potentiels inférieurs avec une meilleure cyclabilité. L’activité réversible redox du soufre a été confirmée par électrochimie et par analyses de surface ex situ mais des caractérisations plus poussées sont nécessaires pour élucider le procédé redox complexe du sélénium.

This thesis focuses on the development of overlithiated disordered rocksalts for high-energy Li-ion systems. Firstly, synthesis parameters have been optimized to improve the performances of the disordered rocksalt Li2.2NiTi0.2Nb0.6O4. To examine its high irreversibility (35%) at the first cycle, in situ advanced structural and electrochemical analyses have been performed. Results show that a structural change and disordering happen during the first charge. In a second part, the disordered rocksalt Li2TiS3 has been prepared with our patented process. To improve cycling stability of the cells, Li2TiS3 has been partially substituted with selenium and new Li2TiSexS3-x compositions have been prepared. Li2TiSexS3-x cells have large discharge capacities at slightly lower potentials. Reversible sulfur redox activity is confirmed by electrochemistry and ex situ surface analyses, however further characterizations are required to elucidate the relatively complex selenium redox process.

Advisors/Committee Members: Martinet, Sébastien (thesis director), Colin, Jean-François (thesis director), Peralta, David (thesis director).

Subjects/Keywords: Caractérisation; Cathode; Batterie Li-Ion; Characterization; Cathode; Li-Ion battery; 620

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Celasun, Y. (2020). Synthèse et caractérisation de nouveaux matériaux d'électrode positive pour des applications Li-ion à haute énergie : Synthesis and characterization of new positive electrode materials for Li-ion high energy applications. (Doctoral Dissertation). Université Grenoble Alpes. Retrieved from http://www.theses.fr/2020GRALI047

Chicago Manual of Style (16^th Edition):

Celasun, Yagmur. “Synthèse et caractérisation de nouveaux matériaux d'électrode positive pour des applications Li-ion à haute énergie : Synthesis and characterization of new positive electrode materials for Li-ion high energy applications.” 2020. Doctoral Dissertation, Université Grenoble Alpes. Accessed March 04, 2021. http://www.theses.fr/2020GRALI047.

MLA Handbook (7^th Edition):

Celasun, Yagmur. “Synthèse et caractérisation de nouveaux matériaux d'électrode positive pour des applications Li-ion à haute énergie : Synthesis and characterization of new positive electrode materials for Li-ion high energy applications.” 2020. Web. 04 Mar 2021.

Vancouver:

Celasun Y. Synthèse et caractérisation de nouveaux matériaux d'électrode positive pour des applications Li-ion à haute énergie : Synthesis and characterization of new positive electrode materials for Li-ion high energy applications. [Internet] [Doctoral dissertation]. Université Grenoble Alpes; 2020. [cited 2021 Mar 04]. Available from: http://www.theses.fr/2020GRALI047.

Council of Science Editors:

Celasun Y. Synthèse et caractérisation de nouveaux matériaux d'électrode positive pour des applications Li-ion à haute énergie : Synthesis and characterization of new positive electrode materials for Li-ion high energy applications. [Doctoral Dissertation]. Université Grenoble Alpes; 2020. Available from: http://www.theses.fr/2020GRALI047

University of Maryland

8. Luo, Chao. Organic Anodes and Sulfur/Selenium Cathodes for Advanced Li and Na Batteries.

Degree: Chemical Engineering, 2015, University of Maryland

URL: http://hdl.handle.net/1903/17233

► To address energy crisis and environmental pollution induced by fossil fuels, there is an urgent demand to develop sustainable, renewable, environmental benign, low cost and… (more)

▼ To address energy crisis and environmental pollution induced by fossil fuels, there is an urgent demand to develop sustainable, renewable, environmental benign, low cost and high capacity energy storage devices to power electric vehicles and enhance clean energy approaches such as solar energy, wind energy and hydroenergy. However, the commercial Li-ion batteries cannot satisfy the critical requirements for next generation rechargeable batteries. The commercial electrode materials (graphite anode and LiCoO2 cathode) are unsustainable, unrenewable and environmental harmful. Organic materials derived from biomasses are promising candidates for next generation rechargeable battery anodes due to their sustainability, renewability, environmental benignity and low cost. Driven by the high potential of organic materials for next generation batteries, I initiated a new research direction on exploring advanced organic compounds for Li-ion and Na-ion battery anodes. In my work, I employed croconic acid disodium salt and 2,5-Dihydroxy-1,4-benzoquinone disodium salt as models to investigate the effects of size and carbon coating on electrochemical performance for Li-ion and Na-ion batteries. The results demonstrate that the minimization of organic particle size into nano-scale and wrapping organic materials with graphene oxide can remarkably enhance the rate capability and cycling stability of organic anodes in both Li-ion and Na-ion batteries. To match with organic anodes, high capacity sulfur and selenium cathodes were also investigated. However, sulfur and selenium cathodes suffer from low electrical conductivity and shuttle reaction, which result in capacity fading and poor lifetime. To circumvent the drawbacks of sulfur and selenium, carbon matrixes such as mesoporous carbon, carbonized polyacrylonitrile and carbonized perylene-3, 4, 9, 10-tetracarboxylic dianhydride are employed to encapsulate sulfur, selenium and selenium sulfide. The resulting composites exhibit exceptional electrochemical performance owing to the high conductivity of carbon and effective restriction of polysulfides and polyselenides in carbon matrix, which avoids shuttle reaction. Advisors/Committee Members: Wang, Chunsheng (advisor).

Subjects/Keywords: Chemical engineering; Energy; Engineering; Lithium Ion Batteries; Organic Anode; Selenium Cathode; Selenium Sulfide Cathode; Sodium Ion Batteries; Sulfur Cathode

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Luo, C. (2015). Organic Anodes and Sulfur/Selenium Cathodes for Advanced Li and Na Batteries. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/17233

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Luo, Chao. “Organic Anodes and Sulfur/Selenium Cathodes for Advanced Li and Na Batteries.” 2015. Thesis, University of Maryland. Accessed March 04, 2021. http://hdl.handle.net/1903/17233.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Luo, Chao. “Organic Anodes and Sulfur/Selenium Cathodes for Advanced Li and Na Batteries.” 2015. Web. 04 Mar 2021.

Vancouver:

Luo C. Organic Anodes and Sulfur/Selenium Cathodes for Advanced Li and Na Batteries. [Internet] [Thesis]. University of Maryland; 2015. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/1903/17233.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Luo C. Organic Anodes and Sulfur/Selenium Cathodes for Advanced Li and Na Batteries. [Thesis]. University of Maryland; 2015. Available from: http://hdl.handle.net/1903/17233

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Oregon State University

9. Wells, Bruce Arrington. Recording impulse waves with the Dufour cathode-ray oscillograph.

Degree: MS, Electrical Engineering, 1941, Oregon State University

URL: http://hdl.handle.net/1957/53634

Subjects/Keywords: Cathode ray oscillograph

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wells, B. A. (1941). Recording impulse waves with the Dufour cathode-ray oscillograph. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/53634

Chicago Manual of Style (16^th Edition):

Wells, Bruce Arrington. “Recording impulse waves with the Dufour cathode-ray oscillograph.” 1941. Masters Thesis, Oregon State University. Accessed March 04, 2021. http://hdl.handle.net/1957/53634.

MLA Handbook (7^th Edition):

Wells, Bruce Arrington. “Recording impulse waves with the Dufour cathode-ray oscillograph.” 1941. Web. 04 Mar 2021.

Vancouver:

Wells BA. Recording impulse waves with the Dufour cathode-ray oscillograph. [Internet] [Masters thesis]. Oregon State University; 1941. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/1957/53634.

Council of Science Editors:

Wells BA. Recording impulse waves with the Dufour cathode-ray oscillograph. [Masters Thesis]. Oregon State University; 1941. Available from: http://hdl.handle.net/1957/53634

Texas A&M University

10. Lynch, Thomas. Surface Modification of LiNi0.5Mn0.3Co0.2O2 Cathode for Improved Battery Performance.

Degree: MS, Electrical Engineering, 2012, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11836

► This thesis details electrical and physical measurements of pulsed laser deposition-applied thin film coatings of Alumina, Ceria, and Yttria-stabilized Zirconia (YSZ) on a LiNi0.5Mn0.3Co0.2O2 (NMC)… (more)

▼ This thesis details electrical and physical measurements of pulsed laser deposition-applied thin film coatings of Alumina, Ceria, and Yttria-stabilized Zirconia (YSZ) on a LiNi0.5Mn0.3Co0.2O2 (NMC) cathode in a Lithium ion battery. Typical NMC cathodes exhibit problems such as decreased rate performance and an opportunity for increased capacity exists by raising operation voltage beyond the electrolyte stability window. Very thin (~10 nm) coatings of stable oxides provide a pathway to solve both problems. As well, the electrochemical impedance spectra of the uncoated and coated cells were measured after different numbers of cycles to reveal the property variation in the cathode. Further understanding of the mechanism of rate performance enhancement and chemical protection by thin oxide coatings will continue to improve battery capability and open up new applications. Ceria-coated Li-NMC cells show the best capacity and rate performance in battery testing. Through electrochemical impedance spectroscopy (EIS), the surface film resistance was found to remain stable or even drop slightly after repeated cycling at high voltage. CeO2 is proposed as a coating for Lithium ion battery cathodes owing to its high chemical stability and the demonstrated but not yet well understood electrical conductivity. Alumina-coated cathode shows comparable performance as that of the uncoated cell in the early stage of the test, but through the course of testing the rate capability and recoverable capacity is improved. This is possibly due to Al2O3?s well-known abilities as HF scavenger and chemically inert nature. YSZ-coated cathode performs worse than the uncoated ones in terms of capacity, rate capability, and EIS-related figures of merit. The reason for the poor performance is not yet known, and repeatability tests are under way to verify performance. High voltage cycling reveals no obvious difference in irreversible loss between the coated or uncoated cells. The reason for the lack of distinction could be the relatively small percentage of surface coating compared to the thick doctor-blade processed cathode layer. Advisors/Committee Members: Wang, Haiyan (advisor), Harris, Harlan (committee member), Radovic, Miladin (committee member), Annapareddy, Narasimha (committee member).

Subjects/Keywords: Lithium ion battery; surface modification; cathode; NMC

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lynch, T. (2012). Surface Modification of LiNi0.5Mn0.3Co0.2O2 Cathode for Improved Battery Performance. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11836

Chicago Manual of Style (16^th Edition):

Lynch, Thomas. “Surface Modification of LiNi0.5Mn0.3Co0.2O2 Cathode for Improved Battery Performance.” 2012. Masters Thesis, Texas A&M University. Accessed March 04, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11836.

MLA Handbook (7^th Edition):

Lynch, Thomas. “Surface Modification of LiNi0.5Mn0.3Co0.2O2 Cathode for Improved Battery Performance.” 2012. Web. 04 Mar 2021.

Vancouver:

Lynch T. Surface Modification of LiNi0.5Mn0.3Co0.2O2 Cathode for Improved Battery Performance. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11836.

Council of Science Editors:

Lynch T. Surface Modification of LiNi0.5Mn0.3Co0.2O2 Cathode for Improved Battery Performance. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11836

University of Newcastle

11. Jones, Timothy William. Prospecting for advanced battery materials.

Degree: PhD, 2010, University of Newcastle

URL: http://hdl.handle.net/1959.13/807524

►

Research Doctorate - Doctor of Philosophy (PhD)

Modern society is highly dependent on portable power sources to power portable electronic devices (laptop computers, mobile phones… (more)

Subjects/Keywords: battery cathode; primary; alkaline; copper oxide; secondary

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Jones, T. W. (2010). Prospecting for advanced battery materials. (Doctoral Dissertation). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/807524

Chicago Manual of Style (16^th Edition):

Jones, Timothy William. “Prospecting for advanced battery materials.” 2010. Doctoral Dissertation, University of Newcastle. Accessed March 04, 2021. http://hdl.handle.net/1959.13/807524.

MLA Handbook (7^th Edition):

Jones, Timothy William. “Prospecting for advanced battery materials.” 2010. Web. 04 Mar 2021.

Vancouver:

Jones TW. Prospecting for advanced battery materials. [Internet] [Doctoral dissertation]. University of Newcastle; 2010. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/1959.13/807524.

Council of Science Editors:

Jones TW. Prospecting for advanced battery materials. [Doctoral Dissertation]. University of Newcastle; 2010. Available from: http://hdl.handle.net/1959.13/807524

University of Wollongong

12. Idris, Nurul Hayati. Advanced materials for lithium rechargeable battery.

Degree: PhD, Faculty of Engineering, 2011, University of Wollongong

URL: ; https://ro.uow.edu.au/theses/3492

► Due to the rapid increase in the use of portable computers, mobile phones, and electric vehicles, there is an increasing demand for larger capacity,… (more)

▼ Due to the rapid increase in the use of portable computers, mobile phones, and electric vehicles, there is an increasing demand for larger capacity, smaller size, lighter weight and lower priced rechargeable batteries. Lithium ion battery technology offers the highest energy densities by weight of all the commercial rechargeable battery technologies, with high voltage, long cycle life, and a wide environmental operation range. Commercial lithium ion battery electrodes today contain expensive and hazardous cathode (lithium cobalt oxide) and low specific capacity anode (carbonaceous materials). It is desirable to replace these materials with potentially cheaper, less toxic materials that have high specific capacity. In this doctoral work, several nanostructured materials and nanocomposites were examined and characterized as potential electrode material in lithium storage applications. In an attempt to improve the performance of nickel oxide (NiO), NiO-polypyrrole (PPy) and NiO-graphene nanocomposite were prepared and investigated as possible anode materials. Meanwhile, several cathode materials were studied: LiV₃O₈/carbon nanocomposite and nickel sulfide (NiS). The superior performance of poly(vinylidene fluoride)/poly(methyl methacrylate) (PVDF/PMMA) gel polymer electrolyte in lithium-polymer batteries was also demonstrated. NiO-PPy nanocomposites for lithium-ion batteries were prepared by a chemical polymerization method, with sodium p-toluenesulfonate as the dopant, Triton X-100 as the surfactant, and FeCl3 as the oxidant. The new composite material was characterized by Raman spectroscopy, thermogravimetric analysis (TGA), scanning electronmicroscopy (SEM), and field-emission scanning electron microscopy (FESEM). Nanosize conducting PPy particles with a cauliflower-like morphology were uniformly coated onto the surface of the NiO powder. The electrochemical results were improved for the NiO-PPy composite compared with the pristine NiO. After 30 cycles, the capacities of the NiO and the NiO-PPy composite were about 119 and 436 mAh g^-1, respectively, indicating that the electrochemical performance of the composite was significantly improved. Graphene-metal-oxide composites as anode materials for Li-ion batteries have been investigated extensively, but these attempts have been mostly limited to moderate rate charge-discharge applications. Here, NiO-graphene nanostructures have been synthesized using a controlled hydrothermal method, which enables in situ formation of NiO with a coralloid nanostructure on graphene. Graphene/NiO (20%), graphene/NiO (50%), and pure NiO show stable discharge capacities of 185 mAh g^-1 at 20 C (1 C = 300 mA g^-1), 450 mAh g^-1 at 1 C, and 400 mAh g^-1 at 1 C, respectively. High rate capability and good stability in prolonged charge-discharge cycling permit the application of this material in fast charging batteries for upcoming electric vehicles. To the best of our knowledge, such fast rate performance…

Subjects/Keywords: lithium-ion; solid polymer electrolytes; cathode; anode

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Idris, N. H. (2011). Advanced materials for lithium rechargeable battery. (Doctoral Dissertation). University of Wollongong. Retrieved from ; https://ro.uow.edu.au/theses/3492

Chicago Manual of Style (16^th Edition):

Idris, Nurul Hayati. “Advanced materials for lithium rechargeable battery.” 2011. Doctoral Dissertation, University of Wollongong. Accessed March 04, 2021. ; https://ro.uow.edu.au/theses/3492.

MLA Handbook (7^th Edition):

Idris, Nurul Hayati. “Advanced materials for lithium rechargeable battery.” 2011. Web. 04 Mar 2021.

Vancouver:

Idris NH. Advanced materials for lithium rechargeable battery. [Internet] [Doctoral dissertation]. University of Wollongong; 2011. [cited 2021 Mar 04]. Available from: ; https://ro.uow.edu.au/theses/3492.

Council of Science Editors:

Idris NH. Advanced materials for lithium rechargeable battery. [Doctoral Dissertation]. University of Wollongong; 2011. Available from: ; https://ro.uow.edu.au/theses/3492

University of Wollongong

13. Li, Dan. Preparation and electrochemical properties of nanostructured electrode materials for lithium ion batteries.

Degree: Doctor of Philosophy, 2014, University of Wollongong

URL: ; https://ro.uow.edu.au/theses/4370

► Lithium ion batteries (LIBs) have been regarded as the most successful electrochemical power sources for a wide range of applications, including consumer devices, portable… (more)

▼ Lithium ion batteries (LIBs) have been regarded as the most successful electrochemical power sources for a wide range of applications, including consumer devices, portable electronics, electric vehicles, and renewable energy storage, due to their potential for high power density and high energy density. Tremendous efforts have been made towards even further improving their high capacity, excellent rate capability, and cycling stability by developing novel cathode and anode materials to meet the increasing power-supply requirements. In this thesis, a series of electrode materials, including germanium, germanate, cobalt oxide, titanium dioxide, and lithium iron phosphate have been synthesized, and their physical and electrochemical performances were investigated. Ultra-fine Co₃O₄ nanocrystals homogeneously attached to nitrogen-doped reduced graphene oxide (rGO) by the hydrothermal reaction method have been demonstrated as promising anode materials for the lithium ion battery. Transmission electron microscope images revealed that the crystal size of Co₃O₄ in Co₃O₄/N-rGO and Co₃O₄/rGO is 5-10 nm, much smaller than that of bare Co₃O₄, indicating that the reduced graphene oxide sheets with Co₃O₄ nanocrystals attached could hinder the growth and aggregation of Co₃O₄ crystals during synthesis. The graphene sheets can also effectively buffer the volume changes in Co₃O₄ upon lithium insertion/extraction, thus improving the cycling performance of the composite electrodes. The doped nitrogen on the reduced graphene oxide can not only improve the conductivity of the graphene sheets, but also introduces defects to store lithium and enhance the connection of the Co₃O₄ nanocrystals to the graphene sheets, leading to better distribution of Co₃O₄ on the graphene sheets and enhanced rate performance. The nitrogen doping combined with these unique structural features is a promising strategy for the development of electrode materials for lithium ion batteries with high electrochemical performance. Anatase TiO₂ nanoparticles grown in situ on nitrogen-doped reduced graphene oxide have been successfully synthesized as an anode material for the lithium ion battery. The nanosized TiO₂…

Subjects/Keywords: Nanostructure; Anode; Cathode; Lithium ion batteries

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Li, D. (2014). Preparation and electrochemical properties of nanostructured electrode materials for lithium ion batteries. (Doctoral Dissertation). University of Wollongong. Retrieved from ; https://ro.uow.edu.au/theses/4370

Chicago Manual of Style (16^th Edition):

Li, Dan. “Preparation and electrochemical properties of nanostructured electrode materials for lithium ion batteries.” 2014. Doctoral Dissertation, University of Wollongong. Accessed March 04, 2021. ; https://ro.uow.edu.au/theses/4370.

MLA Handbook (7^th Edition):

Li, Dan. “Preparation and electrochemical properties of nanostructured electrode materials for lithium ion batteries.” 2014. Web. 04 Mar 2021.

Vancouver:

Li D. Preparation and electrochemical properties of nanostructured electrode materials for lithium ion batteries. [Internet] [Doctoral dissertation]. University of Wollongong; 2014. [cited 2021 Mar 04]. Available from: ; https://ro.uow.edu.au/theses/4370.

Council of Science Editors:

Li D. Preparation and electrochemical properties of nanostructured electrode materials for lithium ion batteries. [Doctoral Dissertation]. University of Wollongong; 2014. Available from: ; https://ro.uow.edu.au/theses/4370

IUPUI

14. Bell, Michaela Elaine. Novel organosulfur cathode materials for advanced lithium batteries.

Degree: 2018, IUPUI

URL: http://hdl.handle.net/1805/15954

►

Indiana University-Purdue University Indianapolis (IUPUI)

Recent innovations in portable electronics, electric vehicles and power generation by wind and solar have expanded the need for effcient… (more)

Subjects/Keywords: Lithium Sulfur Batteries; Cathode Materials; Flexible

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bell, M. E. (2018). Novel organosulfur cathode materials for advanced lithium batteries. (Thesis). IUPUI. Retrieved from http://hdl.handle.net/1805/15954

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Bell, Michaela Elaine. “Novel organosulfur cathode materials for advanced lithium batteries.” 2018. Thesis, IUPUI. Accessed March 04, 2021. http://hdl.handle.net/1805/15954.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Bell, Michaela Elaine. “Novel organosulfur cathode materials for advanced lithium batteries.” 2018. Web. 04 Mar 2021.

Vancouver:

Bell ME. Novel organosulfur cathode materials for advanced lithium batteries. [Internet] [Thesis]. IUPUI; 2018. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/1805/15954.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bell ME. Novel organosulfur cathode materials for advanced lithium batteries. [Thesis]. IUPUI; 2018. Available from: http://hdl.handle.net/1805/15954

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Oregon State University

15. Edgar, Charles Clifton. A logarithmic sweep for sampling oscilloscopes.

Degree: MS, Electrical and Electronics Engineering, 1969, Oregon State University

URL: http://hdl.handle.net/1957/46530

► The use of the exponential-transfer-characteristics of a transistor junction as a means of giving a logarithmic sweep calibration to a sampling oscilloscope is presented. The… (more)

Subjects/Keywords: Cathode ray oscillograph

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Edgar, C. C. (1969). A logarithmic sweep for sampling oscilloscopes. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/46530

Chicago Manual of Style (16^th Edition):

Edgar, Charles Clifton. “A logarithmic sweep for sampling oscilloscopes.” 1969. Masters Thesis, Oregon State University. Accessed March 04, 2021. http://hdl.handle.net/1957/46530.

MLA Handbook (7^th Edition):

Edgar, Charles Clifton. “A logarithmic sweep for sampling oscilloscopes.” 1969. Web. 04 Mar 2021.

Vancouver:

Edgar CC. A logarithmic sweep for sampling oscilloscopes. [Internet] [Masters thesis]. Oregon State University; 1969. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/1957/46530.

Council of Science Editors:

Edgar CC. A logarithmic sweep for sampling oscilloscopes. [Masters Thesis]. Oregon State University; 1969. Available from: http://hdl.handle.net/1957/46530

Oregon State University

16. Perkins, Peter Eugene. The design and development of a noncompressing post-deflection acceleration method for cathode-ray tubes.

Degree: MS, Electrical and Electronics Engineering, 1967, Oregon State University

URL: http://hdl.handle.net/1957/47132

► A short history is given of cathode-ray tubes, from the earliest laboratory tubes available during the early 1900's through present day high performance tubes. Special… (more)

Subjects/Keywords: Cathode ray tubes

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Perkins, P. E. (1967). The design and development of a noncompressing post-deflection acceleration method for cathode-ray tubes. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/47132

Chicago Manual of Style (16^th Edition):

Perkins, Peter Eugene. “The design and development of a noncompressing post-deflection acceleration method for cathode-ray tubes.” 1967. Masters Thesis, Oregon State University. Accessed March 04, 2021. http://hdl.handle.net/1957/47132.

MLA Handbook (7^th Edition):

Perkins, Peter Eugene. “The design and development of a noncompressing post-deflection acceleration method for cathode-ray tubes.” 1967. Web. 04 Mar 2021.

Vancouver:

Perkins PE. The design and development of a noncompressing post-deflection acceleration method for cathode-ray tubes. [Internet] [Masters thesis]. Oregon State University; 1967. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/1957/47132.

Council of Science Editors:

Perkins PE. The design and development of a noncompressing post-deflection acceleration method for cathode-ray tubes. [Masters Thesis]. Oregon State University; 1967. Available from: http://hdl.handle.net/1957/47132

University of Connecticut

17. Lassman, Alexander M. Evaluation of Cathode Materials for Low Temperature (500-700C) Solid Oxide Fuel Cells.

Degree: MS, Mechanical Engineering, 2011, University of Connecticut

URL: https://opencommons.uconn.edu/gs_theses/196

► <a></a>Solid oxide fuel cells (SOFC) have gained a great deal of interest, due to their potential for high efficiency power generation and ability to… (more)

▼ <a></a>Solid oxide fuel cells (SOFC) have gained a great deal of interest, due to their potential for high efficiency power generation and ability to utilize hydrogen fuel, as well as various hydrocarbon-based fuels. A recent trend in SOFC development has been towards lower operating temperatures (500-700°C), which can substantially reduce the cost and complexity of the system. This thesis presents an investigation into state of the art Ba- and La- based cathode materials for use in low temperature (500-700°C) solid oxide fuel cells. Synthesis of A-site deficient [A=0.97] Ba_0.5Sr_0.5Co_0.8Fe_0.2O₃ (BSCF) was accomplished by the EDTA-citrate method. This powder was compared against a commercially available La_0.6Sr_0.4Co_0.2Fe_0.8O₃ (LSCF) powder used as a reference. The phase structure and morphology of the powders was characterized using XRD analysis, SEM imaging, and BET surface area analysis. Thermal expansion and thermogravimetric measurements were performed to characterize the chemical and mechanical properties of the powders up to 800°C. The powders were also found to develop a secondary surface phase after exposure to ambient air at room temperature for as little as 100h. This phase was attributed to surface A-site carbonate formation due to exposure to atmospheric CO₂. Symmetric cells were prepared and electrochemically characterized using AC impedance spectroscopy in a range of 500-700°C, and a PO₂ of 1.0-0.01 atm. The BSCF was found to have a ~7x lower ASR than LSCF at 600°C (0.4 Ωcm² vs. 2.95 Ωcm² at 600°C). The impedance spectra were modeled using an equivalent circuit model, and three distinct processes were identified. These processes were ultimately attributed to a charge transfer process, a surface exchange process, and a gas diffusion process. Using the calculated PO₂ and temperature dependencies, a model was proposed to explain the mechanism behind the oxygen reduction reaction on the BSCF cathode. It was found that below 600°C, the primary mechanism is partial reduction of the gaseous oxygen, possibly followed by surface diffusion. Above 600°C, the gaseous oxygen is completely reduced and incorporated into the bulk of the cathode, where it undergoes bulk diffusion to the cathode/electrolyte interface. Advisors/Committee Members: Ugur Pasaogullari, Gary L. McVay, Atul Verma, Leon Shaw, Prabhakar Singh.

Subjects/Keywords: solid oxide fuel cell; cathode; BSCF

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lassman, A. M. (2011). Evaluation of Cathode Materials for Low Temperature (500-700C) Solid Oxide Fuel Cells. (Masters Thesis). University of Connecticut. Retrieved from https://opencommons.uconn.edu/gs_theses/196

Chicago Manual of Style (16^th Edition):

Lassman, Alexander M. “Evaluation of Cathode Materials for Low Temperature (500-700C) Solid Oxide Fuel Cells.” 2011. Masters Thesis, University of Connecticut. Accessed March 04, 2021. https://opencommons.uconn.edu/gs_theses/196.

MLA Handbook (7^th Edition):

Lassman, Alexander M. “Evaluation of Cathode Materials for Low Temperature (500-700C) Solid Oxide Fuel Cells.” 2011. Web. 04 Mar 2021.

Vancouver:

Lassman AM. Evaluation of Cathode Materials for Low Temperature (500-700C) Solid Oxide Fuel Cells. [Internet] [Masters thesis]. University of Connecticut; 2011. [cited 2021 Mar 04]. Available from: https://opencommons.uconn.edu/gs_theses/196.

Council of Science Editors:

Lassman AM. Evaluation of Cathode Materials for Low Temperature (500-700C) Solid Oxide Fuel Cells. [Masters Thesis]. University of Connecticut; 2011. Available from: https://opencommons.uconn.edu/gs_theses/196

18. Dumaisnil, Kévin. Élaboration et caractérisations de matériaux de cathode et d'électrolyte pour pile à combustible à oxyde solide : Elaboration and characterization of cathode and electrolyte materials for solid oxide fuel cell.

Degree: Docteur es, Science des matériaux, 2015, Littoral

URL: http://www.theses.fr/2015DUNK0396

►

L'énergie produite par des matières fossiles, pétrole et charbon, va se raréfier de manière inéluctable et couter de plus en plus cher à moyen terme.… (more)

▼

L'énergie produite par des matières fossiles, pétrole et charbon, va se raréfier de manière inéluctable et couter de plus en plus cher à moyen terme. Pour pallier à la fin des matières fossiles, le développement d'énergies alternatives est indispensable. Parmi celles-ci, la production d'électricité et de chaleur à partir d'hydrogène commence à se développer grâce aux piles à combustible (PAC) depuis les très faibles puissances (des microwatts pour alimenter les capteurs) jusqu'aux fortes puissances (des Mégawatts pour l'industrie) en passant par des puissances moyennes (des kilowatts pour le résidentiel). Une PAC est constituée de 3 éléments : 2 électrodes (anode et cathode) séparées par un électrolyte. Dans cette thèse, ces 3 éléments sont constitués d'oxydes solides et la pile est appelée SOFC (Solid Oxide Fuel Cell). Les piles SOFC actuellement commercialisées fonctionnent à de très hautes températures, typiquement supérieures à 800°C. L'objectif du travail a été d'élaborer des oxydes pour diminuer cette température vers 600°C ce qui permet d'utiliser de l'acier pour contenir ces piles. Pour que la pile SOFC fonctionne à cette température, il est impératif de diminuer la résistance électrique des 2 électrodes et de l'électrolyte de manière à récupérer une tension électrique continue maximale aux bornes de la pile et aussi à faire passer un courant électrique élevé dans celle-ci. La cathode, en contact avec l'oxygène de l'air, est l'élément le plus critique à optimiser. Nous avons choisi comme matériau de cathode un matériau déjà étudié, La₀.₆Sr₀.₄Co₀.₈Fe₀.₂O₃ (LSCF) et comme électrolyte Ce₀.₉Gd₀.₁O₂ (CGO) connu comme performant en dessous de 650 °C. Nous avons élaboré ces matériaux par une méthode de chimie douce, la méthode sol-gel Péchini, et caractérisé ceuxi-ci par diffraction de rayons X et microscopie électronique à balayage. Une part importante du travail a été la caractérisation électrique à l'aide de mesures d'impédance complexe dans une large gamme de fréquence (0,05 Hz à 2 MHz) et de température (300°C à 700 °C). Le meilleur résultat a été obtenu avec une cathode composite poreuse d'épaisseur 40 µm constituée à masses égales de LSCF et de CGO déposée par sérigraphie sur une céramique dense de CGO d'épaisseur 1,5 mm. De plus, un film mince dense de LSCF d'épaisseur 0,1 µm environ a été déposé par centrifugation pour améliorer l'interface entre la cathode et l'électrolyte. À 600 °C la résistance de cette cathode a été mesurée à 0,13 Ω pour 1 cm² de cathode : cette valeur est à l'état de l'art. Une étude du vieillissement de cette cathode et de l'électrolyte a été effectuée à 600 °C pendant 1000 h en continu sous air : cela s'est traduit par une augmentation de la résistance de la cathode de 32%. Ceci peut être lié à la différence de valeurs des coefficients d'expansion thermique des matériaux de cathode et d'électrolyte.

Energy made from fossil fuels, oil or coal, is becoming increasingly rare and its price will increase in the near future. Developing alternative energy sources could compensate the use…

Advisors/Committee Members: Carru, Jean-Claude (thesis director), Fasquelle, Didier (thesis director).

Subjects/Keywords: Sofc; Cathode; Lscf; Mesure de spectroscopie d'impédance complexe; Pechini; Etude interface cathode-électrolyte; Sofc; Cathode; Lscf; Electrochemical impedance spectroscopy; Pechini; Cathode-electrolyte interface

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dumaisnil, K. (2015). Élaboration et caractérisations de matériaux de cathode et d'électrolyte pour pile à combustible à oxyde solide : Elaboration and characterization of cathode and electrolyte materials for solid oxide fuel cell. (Doctoral Dissertation). Littoral. Retrieved from http://www.theses.fr/2015DUNK0396

Chicago Manual of Style (16^th Edition):

Dumaisnil, Kévin. “Élaboration et caractérisations de matériaux de cathode et d'électrolyte pour pile à combustible à oxyde solide : Elaboration and characterization of cathode and electrolyte materials for solid oxide fuel cell.” 2015. Doctoral Dissertation, Littoral. Accessed March 04, 2021. http://www.theses.fr/2015DUNK0396.

MLA Handbook (7^th Edition):

Dumaisnil, Kévin. “Élaboration et caractérisations de matériaux de cathode et d'électrolyte pour pile à combustible à oxyde solide : Elaboration and characterization of cathode and electrolyte materials for solid oxide fuel cell.” 2015. Web. 04 Mar 2021.

Vancouver:

Dumaisnil K. Élaboration et caractérisations de matériaux de cathode et d'électrolyte pour pile à combustible à oxyde solide : Elaboration and characterization of cathode and electrolyte materials for solid oxide fuel cell. [Internet] [Doctoral dissertation]. Littoral; 2015. [cited 2021 Mar 04]. Available from: http://www.theses.fr/2015DUNK0396.

Council of Science Editors:

Dumaisnil K. Élaboration et caractérisations de matériaux de cathode et d'électrolyte pour pile à combustible à oxyde solide : Elaboration and characterization of cathode and electrolyte materials for solid oxide fuel cell. [Doctoral Dissertation]. Littoral; 2015. Available from: http://www.theses.fr/2015DUNK0396

Uppsala University

19. Rehnlund, David. Nanostructured Cathodes : A step on the path towards a fully interdigitated 3-D microbattery.

Degree: Inorganic Chemistry, 2011, Uppsala University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-169405

► The Li-ion field of battery research has in the latest decades made substantial progress and is seen to be the most promising battery technology… (more)

▼ The Li-ion field of battery research has in the latest decades made substantial progress and is seen to be the most promising battery technology due to the high volume and specific energy densities of Li-ion batteries. However, in order to achieve a battery capable of competing with the energy density of a combustion engine, further research into new electrode materials is required. As the cathode materials are the limiting factor in terms of capacity, this is the main area in need of further research. The introduction of 3-D electrodes brought new hope as the ion transportpath is decreased as well as an increased electrode area leading to an increased capacity. This thesis work has focused on the development of aluminium 3-D current collectors in order to improve the electrode area and shorten the Li-ion transportpath. By using a template assisted electrodeposition technique, nanorods of controlled magnitude and order can be synthesized. Furthermore, the electrodeposition brings excellent possibilities of upscaling for future industrial manufacturing of the batterycells. A polycarbonate template material which showed interesting properties,was used in the electrodeposition of aluminium nanorods. As the template pores were nonhomogeneously ordered a number of nonordered nanorods were expected to arise during the deposition. However, a surplus of nanorods in reference to the template pores was acquired. This behavior was investigated and a hypothesis was formed as to the mechanism of the nanorod formation. In order to achieve acomplete cathode electrode, a coating of an ion host material on the nanorods isneeded. Due to its high capacity and voltage, vanadium oxide was selected. Based on previous work with electrodeposition of V2O5 on platinum, a series of experiments were performed to mimic the deposition on an aluminium sample. Unfortunately, the deposition was unsuccessful as the experimental conditions resulted in aluminium corrosion which in turn made deposition of the cathode material impossible. The pH dependence of the deposition was evaluated and the conclusion was drawn, that electrodeposition of vanadium oxide on aluminium is not possible using this approach.

Subjects/Keywords: Nanostructure; Lithium ion battery; microbattery; cathode

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rehnlund, D. (2011). Nanostructured Cathodes : A step on the path towards a fully interdigitated 3-D microbattery. (Thesis). Uppsala University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-169405

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Rehnlund, David. “Nanostructured Cathodes : A step on the path towards a fully interdigitated 3-D microbattery.” 2011. Thesis, Uppsala University. Accessed March 04, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-169405.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Rehnlund, David. “Nanostructured Cathodes : A step on the path towards a fully interdigitated 3-D microbattery.” 2011. Web. 04 Mar 2021.

Vancouver:

Rehnlund D. Nanostructured Cathodes : A step on the path towards a fully interdigitated 3-D microbattery. [Internet] [Thesis]. Uppsala University; 2011. [cited 2021 Mar 04]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-169405.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Rehnlund D. Nanostructured Cathodes : A step on the path towards a fully interdigitated 3-D microbattery. [Thesis]. Uppsala University; 2011. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-169405

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

20. Sabaut, Lucie. Cathode commutable à nanotubes de carbone pour tube à rayons X : Development of carbon nanotube based gated cathodes for X-ray tubes.

Degree: Docteur es, Physique, 2016, Université Paris-Saclay (ComUE)

URL: http://www.theses.fr/2016SACLX078

►

Les systèmes d'imagerie à rayons X (RX) sont des appareils volumineux et contraignants en termes de contrôle du faisceau. L'industrie des tubes électroniques est donc… (more)

▼

Les systèmes d'imagerie à rayons X (RX) sont des appareils volumineux et contraignants en termes de contrôle du faisceau. L'industrie des tubes électroniques est donc à la recherche de solutions pour assurer la stabilité du courant tout en permettant la miniaturisation du système.Ce travail opte pour l'amélioration de la source d'électrons, en remplaçant l'émission thermoïonique historique par l'émission de champ. En particulier, les cathodes froides à base de nanotubes de carbone possèdent l'avantage de pouvoir délivrer de forts courants (>1A/cm²), tout en ayant un faible temps de réponse.A travers le développement d'une structure innovante de cathodes à nanotubes de carbone à grille intégrée, l'objectif de cette étude est de réaliser des sources commutables et régulées, pour des sources de rayons X miniatures, portables ou polyvalentes.La modélisation électrostatique de la nouvelle structure a conduit à la fabrication de cathodes à grille optimisées, sur lesquelles est cru un réseau vertical de nanotubes de carbone. L'analyse de défaillance permet finalement d'obtenir des dispositifs isolés fiables. Leur caractérisation en émission de champ indique des performances de modulation de courant inégalées, de l'ordre de 10⁶ pour +/-40V de polarisation de grille. La régulation du courant a également été démontrée avec l'obtention d'une stabilité à 0,02% sur 100 h.Pour pallier les limitations rencontrées (courant de fuite et croissance parasite), une structure de grille enterrée a été proposée avec succès, ainsi qu'une nouvelle méthode de fabrication d'émetteurs courts et fins. Ces cathodes fonctionnelles ont finalement été intégrées en tube à rayons X et ont montré pour la première fois une modulation de courant de 2000 à une haute tension fixe de 60 kV.

This work chooses to improve the electron source by replacing thermionic emission with field emission. More especially, carbon nanotubes based cold cathodes stand out by their ability to supply high currents (>1A/cm²) while responding fast.Through the development of an innovative structure of in-plane gated carbon nanotube based cathode, this study aims at making switchable and regulated sources for miniature, portable or polyvalent X-rays sources.The electrostatic modelling of the new structure led to the fabrication of optimized gated cathodes, where a vertically aligned array of carbon nanotubes is grown. Default analysis allows to get reliable insulated devices.Field emission characterization shows unprecedented current modulation of 10⁶ at +/-40V bias voltage. Current regulation is also achieved with a stability of 0.02% over 100 h.Another structure with a burried gate electrode was designed to successfully cope with leak current and parasitic growth. A new way of growing short and thin nanotubes was tackled.Finally, gated cathodes were integrated in a compact X-ray tube and showed a current modulation of 2000 at a high voltage of 60 kV.

Advisors/Committee Members: Maurice, Jean-Luc (thesis director).

Subjects/Keywords: Cathode froide; Émission de champ; Nanotube de carbone; Cathode à grille; Modulation; Tube électronique; Cold cathode; Field emission; Carbon nanotube; Gated cathode; Modulation; Vacuum tube

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sabaut, L. (2016). Cathode commutable à nanotubes de carbone pour tube à rayons X : Development of carbon nanotube based gated cathodes for X-ray tubes. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2016SACLX078

Chicago Manual of Style (16^th Edition):

Sabaut, Lucie. “Cathode commutable à nanotubes de carbone pour tube à rayons X : Development of carbon nanotube based gated cathodes for X-ray tubes.” 2016. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed March 04, 2021. http://www.theses.fr/2016SACLX078.

MLA Handbook (7^th Edition):

Sabaut, Lucie. “Cathode commutable à nanotubes de carbone pour tube à rayons X : Development of carbon nanotube based gated cathodes for X-ray tubes.” 2016. Web. 04 Mar 2021.

Vancouver:

Sabaut L. Cathode commutable à nanotubes de carbone pour tube à rayons X : Development of carbon nanotube based gated cathodes for X-ray tubes. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2016. [cited 2021 Mar 04]. Available from: http://www.theses.fr/2016SACLX078.

Council of Science Editors:

Sabaut L. Cathode commutable à nanotubes de carbone pour tube à rayons X : Development of carbon nanotube based gated cathodes for X-ray tubes. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2016. Available from: http://www.theses.fr/2016SACLX078

University of Southern California

21. Rong, Jiepeng. Nanostructured silicon anode and sulfur cathode for lithium rechargeable batteries.

Degree: PhD, Materials Science, 2015, University of Southern California

URL: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/526687/rec/4328

► Silicon and sulfur are both attractive electrode materials for next-generation rechargeable lithium batteries because of their abundance, high specific capacity, and low cost. This thesis… (more)

▼ Silicon and sulfur are both attractive electrode materials for next-generation rechargeable lithium batteries because of their abundance, high specific capacity, and low cost. This thesis is mainly focused on the research progress I made on silicon-based anode materials and sulfur-based cathode materials for rechargeable lithium batteries with improved energy density, power density, and cycle life. ❧ In Chapter 1, the working mechanism of lithium-ion battery, and commercial anode/cathode materials are introduced, which serve as the background information for the following chapters. Then in Chapter 2, the research progress I made in silicon-based anode is presented. To tackle with the problems of silicon anode, such as poor cyclability and early capacity fading due to significant volume change during lithiation and delithiation process, I fabricated a coaxial silicon / anodic titanium oxide / silicon (Si-ATO-Si) nanotube array structure grown on titanium substrate demonstrating excellent electrochemical cyclability. The ATO nanotube scaffold used for Si deposition has many desired features, such as rough surface for enhanced Si adhesion, and direct contact with the Ti substrate working as current collector. More importantly, the ATO scaffold provides a rather unique advantage that Si can be loaded on both the inner and outer surfaces, and an inner pore can be maintained to provide room for Si volume expansion. This coaxial structure shows a capacity above 1500mAh/g after 100 cycles, with less than 0.05% decay per cycle. ❧ In Chapter 3 and Chapter 4, two kinds of sulfur-based cathode materials are reported. In Chapter 3, a generic and facile method of coating graphene oxide (GO) on sulfur particles is presented. The applications of sulfur/GO core-shell particles as Li-S battery cathode materials are further investigated and the results show that sulfur/GO exhibit significant improvements over bare sulfur particles without coating. Galvanic charge-discharge test using GO/sulfur particles shows a specific capacity of 800 mAh/g is retained after 1000 cycles at 1 A/g current rate if only the mass of sulfur is taken into calculation, and 400 mAh/g if the total mass of sulfur/GO is considered. Most importantly, the capacity decay over 1000 cycles is less than 0.02% per cycle. The coating method developed in this study is facile, robust, and versatile, and is expected to have wide range of applications in improving the properties of particle materials. ❧ In Chapter 4, in order to further improve the power density of sulfur-based cathode material, a method of fabricating graphene oxide (GO) wrapped porous carbon/sulfur composite (porous C-S) for high performance lithium-sulfur (Li-S) battery cathode material is reported. A porous C-S composite using conductive porous carbon as framework and sulfur within its channels as filler is synthesized to generate essential electrical contact to the insulating sulfur, thus achieving high specific capacity. Further graphene oxide wrapping over porous C-S is used to mitigate the problem of… Advisors/Committee Members: Zhou, Chongwu (Committee Chair), Goo, Edward K. (Committee Member), Wu, Wei (Committee Member).

Subjects/Keywords: lithium rechargeable batteries; silicon anode; sulfur cathode

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rong, J. (2015). Nanostructured silicon anode and sulfur cathode for lithium rechargeable batteries. (Doctoral Dissertation). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/526687/rec/4328

Chicago Manual of Style (16^th Edition):

Rong, Jiepeng. “Nanostructured silicon anode and sulfur cathode for lithium rechargeable batteries.” 2015. Doctoral Dissertation, University of Southern California. Accessed March 04, 2021. http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/526687/rec/4328.

MLA Handbook (7^th Edition):

Rong, Jiepeng. “Nanostructured silicon anode and sulfur cathode for lithium rechargeable batteries.” 2015. Web. 04 Mar 2021.

Vancouver:

Rong J. Nanostructured silicon anode and sulfur cathode for lithium rechargeable batteries. [Internet] [Doctoral dissertation]. University of Southern California; 2015. [cited 2021 Mar 04]. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/526687/rec/4328.

Council of Science Editors:

Rong J. Nanostructured silicon anode and sulfur cathode for lithium rechargeable batteries. [Doctoral Dissertation]. University of Southern California; 2015. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/526687/rec/4328

University of Cambridge

22. Reeves, Philip James. Multinuclear NMR Investigations of Local Structure, Distortions and Redox Mechanisms in Layered Lithium Ion Battery Cathode Materials.

Degree: PhD, 2020, University of Cambridge

URL: https://www.repository.cam.ac.uk/handle/1810/303659

► Lithium ion (Li ion) battery technology has enabled a complete revolution in consumer electronics and is beginning to have a similar impact on transport. Increased… (more)

Subjects/Keywords: Battery; batteries; NMR; Li ion; Multinuclear; cathode

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Reeves, P. J. (2020). Multinuclear NMR Investigations of Local Structure, Distortions and Redox Mechanisms in Layered Lithium Ion Battery Cathode Materials. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/303659

Chicago Manual of Style (16^th Edition):

Reeves, Philip James. “Multinuclear NMR Investigations of Local Structure, Distortions and Redox Mechanisms in Layered Lithium Ion Battery Cathode Materials.” 2020. Doctoral Dissertation, University of Cambridge. Accessed March 04, 2021. https://www.repository.cam.ac.uk/handle/1810/303659.

MLA Handbook (7^th Edition):

Reeves, Philip James. “Multinuclear NMR Investigations of Local Structure, Distortions and Redox Mechanisms in Layered Lithium Ion Battery Cathode Materials.” 2020. Web. 04 Mar 2021.

Vancouver:

Reeves PJ. Multinuclear NMR Investigations of Local Structure, Distortions and Redox Mechanisms in Layered Lithium Ion Battery Cathode Materials. [Internet] [Doctoral dissertation]. University of Cambridge; 2020. [cited 2021 Mar 04]. Available from: https://www.repository.cam.ac.uk/handle/1810/303659.

Council of Science Editors:

Reeves PJ. Multinuclear NMR Investigations of Local Structure, Distortions and Redox Mechanisms in Layered Lithium Ion Battery Cathode Materials. [Doctoral Dissertation]. University of Cambridge; 2020. Available from: https://www.repository.cam.ac.uk/handle/1810/303659

Georgia Tech

23. Gumb, Dana Frederic. Deflection response characteristics of a cathode-ray tube employing magnetic deflection.

Degree: MS, Electric engineering, 1950, Georgia Tech

URL: http://hdl.handle.net/1853/15896

Subjects/Keywords: Cathode ray tubes

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gumb, D. F. (1950). Deflection response characteristics of a cathode-ray tube employing magnetic deflection. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/15896

Chicago Manual of Style (16^th Edition):

Gumb, Dana Frederic. “Deflection response characteristics of a cathode-ray tube employing magnetic deflection.” 1950. Masters Thesis, Georgia Tech. Accessed March 04, 2021. http://hdl.handle.net/1853/15896.

MLA Handbook (7^th Edition):

Gumb, Dana Frederic. “Deflection response characteristics of a cathode-ray tube employing magnetic deflection.” 1950. Web. 04 Mar 2021.

Vancouver:

Gumb DF. Deflection response characteristics of a cathode-ray tube employing magnetic deflection. [Internet] [Masters thesis]. Georgia Tech; 1950. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/1853/15896.

Council of Science Editors:

Gumb DF. Deflection response characteristics of a cathode-ray tube employing magnetic deflection. [Masters Thesis]. Georgia Tech; 1950. Available from: http://hdl.handle.net/1853/15896

University of Waterloo

24. Raimbault, Justin. Na0.66(Ni0.13Mn0.54Co0.13)O2 Cathode Coated with Alucone by Molecular Layer Deposition for Sodium Ion Batteries.

Degree: 2018, University of Waterloo

URL: http://hdl.handle.net/10012/13596

► The importance of batteries has skyrocketed in the twentieth century due to an impending energy crisis arising from a dependence on fossil fuels. Global warming… (more)

▼ The importance of batteries has skyrocketed in the twentieth century due to an impending energy crisis arising from a dependence on fossil fuels. Global warming has alerted the world to the environmental dangers of fossil fuel reliance and has spurred the development of clean energy sources. Clean energy sources are often less predictable and controllable than fossil fuel energy and require a means of storing energy until its use is required. The spreading growth of the electric vehicle industry has also spurred much research into high-performance batteries. Thus, batteries play an integral role in our everyday lives and are required for an environmentally-conscious future. Lithium ion batteries currently dominate the portable battery industry due to their long lifetime, good capacity, and wide operating window. However, mineable sources of lithium are unsustainable in the long term and their expense, combined with the expense of the cobalt used in commercial cathodes, is a major barrier to widespread adaption of batteries for energy storage and electric vehicles. On the other hand, sodium is much more abundant and inexpensive than lithium, and its electrochemical behaviours are very similar to those of lithium. Thus, much time and effort are being invested into developing sodium ion batteries (SIBs) to replace lithium ion batteries. One problem with many sodium ion battery cathodes is their instability at high voltages. These cathode materials undergo a phase change above 4.3 V which limits their energy density. To solve this problem, a coating can be applied to the cathode particles which prevents side reactions with the electrolyte, dissolution of active materials, and breakdown due to volume changes. Several coating methods could be used to accomplish this, but only atomic/molecular layer deposition can create the ultrathin, homogeneous, and defect-free coatings necessary for high performance SIBs. This thesis work investigates the effect of coating alucone, an alumina containing ethane linkers, deposited by molecular layer deposition on the SIB cathode Na0.66(Ni0.13Mn0.54Co0.13)O2 (NaNMC). This work also details the optimization of the NaNMC cathode with regards to annealing temperature and chelating agent addition. The research described in this thesis shows that an annealing temperature of 850 °C produced the purest crystal structure as observed from XRD and by testing its electrochemical performance. The addition of a chelating agent stabilized the metal ions in solution during synthesis and decreased the agglomeration of the particles after annealing. Specifically, the addition of citric aid resulted in the highest capacity and rate performance when the synthesized cathode material was fabricated into a coin cell, compared to other chelating agents tested. After the optimization of the cathode material was completed, 5, 10, or 20 layers of alucone were coated onto assembled cathodes and their performance at a higher voltage of 4.5 V was compared to a pristine cathode of the same material. The…

Subjects/Keywords: sodium ion battery; molecular layer deposition; cathode

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Raimbault, J. (2018). Na0.66(Ni0.13Mn0.54Co0.13)O2 Cathode Coated with Alucone by Molecular Layer Deposition for Sodium Ion Batteries. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/13596

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Raimbault, Justin. “Na0.66(Ni0.13Mn0.54Co0.13)O2 Cathode Coated with Alucone by Molecular Layer Deposition for Sodium Ion Batteries.” 2018. Thesis, University of Waterloo. Accessed March 04, 2021. http://hdl.handle.net/10012/13596.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Raimbault, Justin. “Na0.66(Ni0.13Mn0.54Co0.13)O2 Cathode Coated with Alucone by Molecular Layer Deposition for Sodium Ion Batteries.” 2018. Web. 04 Mar 2021.

Vancouver:

Raimbault J. Na0.66(Ni0.13Mn0.54Co0.13)O2 Cathode Coated with Alucone by Molecular Layer Deposition for Sodium Ion Batteries. [Internet] [Thesis]. University of Waterloo; 2018. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/10012/13596.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Raimbault J. Na0.66(Ni0.13Mn0.54Co0.13)O2 Cathode Coated with Alucone by Molecular Layer Deposition for Sodium Ion Batteries. [Thesis]. University of Waterloo; 2018. Available from: http://hdl.handle.net/10012/13596

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Waterloo

25. Hart, Connor. The Evolving Search for Positive Electrode Host Materials for the Li-S Battery.

Degree: 2015, University of Waterloo

URL: http://hdl.handle.net/10012/9314

► High energy density storage systems are constantly being researched to support the demand for electric vehicles and use for renewable energy systems. One such energy… (more)

▼ High energy density storage systems are constantly being researched to support the demand for electric vehicles and use for renewable energy systems. One such energy storage system of interest is lithium-sulfur batteries which utilize inexpensive, earth-abundant sulfur as the active material. In order to fully realize the potential of Li-S batteries being commercialized, many problems must still be overcome. Among them are: 1) low conductivity of sulfur species, 2) polysulfide redox shuttle in the electrolyte and self-discharge, 3) volume expansion of active material upon cycling, and 4) lithium metal dendrite formation. The work in this thesis will first focus on a diagnostic method that probes ideal characteristics of sulfur host materials, and then focus on a new material that will address the first three problems. The exhaustive search for a material that has a high electronic conductivity to facilitate charge transfer, substantial surface area and pore volume to allow high sulfur loading, and well-suited physical/chemical surface properties to inhibit Sn2- diffusion into the electrolyte is still ongoing. It is vital to find a material with these characteristics, so as to bring the Li-S battery one step closer to commercialization. In the first section of this thesis, a versatile, cost-effective electrochemical analysis strategy is described that determines the specific Sn2- adsorptivity of materials. This analytical method for screening sulfur host materials is based on metrics: a quantitative electro-oxidation reaction provides the value for Sn2- adsorptivity – which coupled with surface area – is correlated to the extent of self-discharge at an intermediate state of discharge during a 5-day cycling protocol. Measurement of nine different materials with varying surface area, and hydrophobicity using the analytical method determined optimum properties for capacity stabilization. In fact, materials (such as MnO2) that have a high surface area and the ability to chemically interact with intermediate polysulfides realized improved long-term cycling performance and mitigated self-discharge. In the second part of this thesis, a positive electrode material is proposed as a sulfur host. Surface thiosulfate groups are known to drastically mitigate polysulfide diffusion through the formation of a polythionate complex which acts as an internal mediator catenating long-chain polysulfides. The presence of the polythionate complex through an extrinsic additive was explored for low-cost carbon materials. In this study, carbon materials which contained functional groups able to form the polythionate complex saw up to 60% reduction in the irreversible capacity loss as a result of self-discharge. With 15 wt% additive, polysulfide adsorptivity increased and excellent long-term cycling was realized with a capacity fade of 0.085% per cycle over 200 cycles. By combining a polysulfide adsorber with a carbon matrix, long-term cycling is realized with a sulfur loading of ~1.5 mg/cm2.

Subjects/Keywords: Li-S Batteries; Energy Storage; Cathode materials

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hart, C. (2015). The Evolving Search for Positive Electrode Host Materials for the Li-S Battery. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/9314

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hart, Connor. “The Evolving Search for Positive Electrode Host Materials for the Li-S Battery.” 2015. Thesis, University of Waterloo. Accessed March 04, 2021. http://hdl.handle.net/10012/9314.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hart, Connor. “The Evolving Search for Positive Electrode Host Materials for the Li-S Battery.” 2015. Web. 04 Mar 2021.

Vancouver:

Hart C. The Evolving Search for Positive Electrode Host Materials for the Li-S Battery. [Internet] [Thesis]. University of Waterloo; 2015. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/10012/9314.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hart C. The Evolving Search for Positive Electrode Host Materials for the Li-S Battery. [Thesis]. University of Waterloo; 2015. Available from: http://hdl.handle.net/10012/9314

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Cambridge

26. Reeves, Philip James. Multinuclear NMR investigations of local structure, distortions and redox mechanisms in layered lithium ion battery cathode materials.

Degree: PhD, 2020, University of Cambridge

URL: https://doi.org/10.17863/CAM.50736 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.801910

► Lithium ion (Li ion) battery technology has enabled a complete revolution in consumer electronics and is beginning to have a similar impact on transport. Increased… (more)

Subjects/Keywords: Battery; batteries; NMR; Li ion; Multinuclear; cathode

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Reeves, P. J. (2020). Multinuclear NMR investigations of local structure, distortions and redox mechanisms in layered lithium ion battery cathode materials. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.50736 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.801910

Chicago Manual of Style (16^th Edition):

Reeves, Philip James. “Multinuclear NMR investigations of local structure, distortions and redox mechanisms in layered lithium ion battery cathode materials.” 2020. Doctoral Dissertation, University of Cambridge. Accessed March 04, 2021. https://doi.org/10.17863/CAM.50736 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.801910.

MLA Handbook (7^th Edition):

Reeves, Philip James. “Multinuclear NMR investigations of local structure, distortions and redox mechanisms in layered lithium ion battery cathode materials.” 2020. Web. 04 Mar 2021.

Vancouver:

Reeves PJ. Multinuclear NMR investigations of local structure, distortions and redox mechanisms in layered lithium ion battery cathode materials. [Internet] [Doctoral dissertation]. University of Cambridge; 2020. [cited 2021 Mar 04]. Available from: https://doi.org/10.17863/CAM.50736 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.801910.

Council of Science Editors:

Reeves PJ. Multinuclear NMR investigations of local structure, distortions and redox mechanisms in layered lithium ion battery cathode materials. [Doctoral Dissertation]. University of Cambridge; 2020. Available from: https://doi.org/10.17863/CAM.50736 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.801910

University of Cambridge

27. Amigues, Adrien Marie. New metastable cathode materials for lithium-ion batteries.

Degree: PhD, 2018, University of Cambridge

URL: https://doi.org/10.17863/CAM.23588 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744885

► This PhD work is dedicated to the discovery and study of new cathode materials for lithium-ion batteries. To obtain new materials, a well-known strategy based… (more)

▼ This PhD work is dedicated to the discovery and study of new cathode materials for lithium-ion batteries. To obtain new materials, a well-known strategy based on ion-exchanging alkali metals within stable crystalline frameworks was used. Ion-exchange procedures between sodium and lithium ions were performed on known sodiated materials, NaMnTiO4 with the Na0.44MnO2 structure and NaFeTiO4 and Na2Fe3-xSn2xSb1-xO8 (0 ≤ x ≤ 1) with the calcium-ferrite structure. A combination of Energy-Dispersive X-ray Spectroscopy (EDS), Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES), X-ray (XRD) and Neutron (NPD) diffractions was used to determine the crystal structure of the samples obtained via ion-exchange and confirmed that LiMnTiO4 and LiFeTiO4 and Li2Fe3-xSn2xSb1-xO8 (0 ≤ x ≤ 1) were obtained with a 1:1 ion-exchange between sodium and lithium. LiMnTiO4 has the orthorhombic Pbam space group, with a = 9.074(5), b = 24.97(1) and c = 2.899(2) Å. The shapes and dimensions of the channels are modified compared to NaMnTiO4, with displaced alkali metal positions and occupancies. LiMnTiO4 was cycled vs Li and up to 0.89 lithium ions can be reversibly inserted into the structure, with a discharge capacity of 137 mAh/g after 20 cycles at C/20 and room temperature. At 60°C, all the lithium is removed at the end of the first charge at C/20, with subsequent cycles showing reversible insertion of 1.06 Li-ions when cycled between 1.5 and 4.6 V. The electrochemistry of calcium-ferrite LiFeTiO4 and Li2Fe3SbO8 was investigated in half cells versus lithium and up to 0.63 and 1.35 lithium ions can be reversibly inserted into the structure after 50 cycles at a C/5 rate, respectively. LiFeTiO4 showed good cyclability with no capacity fade observed after the second cycle while Li2Fe3SbO8 exhibited a constant capacity fade with a 60 % capacity retention after the 50th cycle. Doping Li2Fe3SbO8 with tin reduces the capacity. However, the capacity retention is significantly enhanced. For Li2Fe2.5Sb0.5SnO8 after 20 cycles at C/5, the capacity is stable and comparable with that observed for Li2Fe3SbO8 after the same number of cycles. Using ion-exchange procedures has allowed new metastable materials to be obtained which have the potential to be used as cathodes in lithium-ion batteries. Doping these families of materials with different atoms has been shown to improve their electrochemical performance. Ex situ XRD was used to demonstrate that the original structures of LiMnTiO4, LiFeTiO4 and Li2Fe3SbO8 are retained during cycling. The volume change observed for Li2Fe3SbO8 upon delithiation was particularly noteworthy with a small decrease of 0.9 % at the end of charge when cycled at C/100 and room temperature, indicating structural stability upon lithium insertion/de-insertion.

Subjects/Keywords: 621.31; lithium; battery; cathode; cell; energy

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Amigues, A. M. (2018). New metastable cathode materials for lithium-ion batteries. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.23588 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744885

Chicago Manual of Style (16^th Edition):

Amigues, Adrien Marie. “New metastable cathode materials for lithium-ion batteries.” 2018. Doctoral Dissertation, University of Cambridge. Accessed March 04, 2021. https://doi.org/10.17863/CAM.23588 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744885.

MLA Handbook (7^th Edition):

Amigues, Adrien Marie. “New metastable cathode materials for lithium-ion batteries.” 2018. Web. 04 Mar 2021.

Vancouver:

Amigues AM. New metastable cathode materials for lithium-ion batteries. [Internet] [Doctoral dissertation]. University of Cambridge; 2018. [cited 2021 Mar 04]. Available from: https://doi.org/10.17863/CAM.23588 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744885.

Council of Science Editors:

Amigues AM. New metastable cathode materials for lithium-ion batteries. [Doctoral Dissertation]. University of Cambridge; 2018. Available from: https://doi.org/10.17863/CAM.23588 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744885

Virginia Tech

28. Jain, Prachi Lalit. Characterization of a Low Current LaB6 Heaterless Hollow Cathode with Krypton Propellant.

Degree: MS, Aerospace Engineering, 2020, Virginia Tech

URL: http://hdl.handle.net/10919/99141

► Recent years have seen rapid growth in the development of both stand-alone satellites and satellite constellations. A critical component of these satellites is the on-board… (more)

▼ Recent years have seen rapid growth in the development of both stand-alone satellites and satellite constellations. A critical component of these satellites is the on-board propulsion system, which is responsible for controlling their orientation with respect to the object of interest and keeping the spacecraft in the assigned orbit. Generally, electric propulsion systems are used for this purpose. These types of propulsion systems use electrical power to change the velocity of satellite, providing a small thrust for a long duration of time as compared to chemical propulsion systems. Certain types of electric thrusters utilize a hollow cathode device as an electron source to start-off and support the thruster operation. In this research, a non-conventional hollow cathode for low power applications is developed and tested. The main characteristic of the developed cathode is the heaterless configuration, which eliminates the heater module used in conventional cathodes to enable the cathode to reach its operational temperature. The absence of a heater reduces the complexity of the cathode and the electrical power system. The cathode utilizes an electron emitter material which is insensitive to impurities and air exposure. Additionally, unlike typical electric thrusters which use xenon as the fuel, this cathode uses krypton which is similar to xenon but is less expensive. The presented work includes an overview of electric propulsion and the hollow cathode operation, followed by a detailed discussion of the heaterless hollow cathode design, the experimental setup and the test results. Several noteworthy findings regarding cathode operation are included as well. This research shows that the non-conventional heaterless hollow cathode and its operation with krypton have the potential to improve the overall thruster performance by reducing the weight and the cost, thus contributing to an integral aspect of satellite on-board propulsion. Advisors/Committee Members: Adams, Colin (committeechair), Earle, Gregory D. (committee member), Srinivasan, Bhuvana (committee member).

Subjects/Keywords: Electric Propulsion; Hollow Cathode; Krypton; Lanthanum hexaboride

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Jain, P. L. (2020). Characterization of a Low Current LaB6 Heaterless Hollow Cathode with Krypton Propellant. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/99141

Chicago Manual of Style (16^th Edition):

Jain, Prachi Lalit. “Characterization of a Low Current LaB6 Heaterless Hollow Cathode with Krypton Propellant.” 2020. Masters Thesis, Virginia Tech. Accessed March 04, 2021. http://hdl.handle.net/10919/99141.

MLA Handbook (7^th Edition):

Jain, Prachi Lalit. “Characterization of a Low Current LaB6 Heaterless Hollow Cathode with Krypton Propellant.” 2020. Web. 04 Mar 2021.

Vancouver:

Jain PL. Characterization of a Low Current LaB6 Heaterless Hollow Cathode with Krypton Propellant. [Internet] [Masters thesis]. Virginia Tech; 2020. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/10919/99141.

Council of Science Editors:

Jain PL. Characterization of a Low Current LaB6 Heaterless Hollow Cathode with Krypton Propellant. [Masters Thesis]. Virginia Tech; 2020. Available from: http://hdl.handle.net/10919/99141

University of Sydney

29. Gummersall, David Vaughan. Scaling laws of electron confinement and power losses in zero and low beta Polywell devices .

Degree: 2014, University of Sydney

URL: http://hdl.handle.net/2123/13541

► The Polywell consists of three orthogonal pairs of opposing coil current loops equidistant from the center of the device. The coils produce strong magnetic field… (more)

▼ The Polywell consists of three orthogonal pairs of opposing coil current loops equidistant from the center of the device. The coils produce strong magnetic field gradients to confine a central negative space charge, of electrons, to create a virtual cathode within the Polywell. To investigate electron confinement in the Polywell, we developed an orbital theory simulation, which was then used to simulate electrons in the vacuum magnetic fields of a zero beta (ratio of plasma pressure to magnetic pressure) Polywell. Both empirical and analytical expressions of the electron conﬁnement time and average position within the device were obtained in terms of the current in the ﬁeld coils, the dimensions of the device, and the kinetic energy of the electrons. Comparisons between the numerical simulations and the analytically derived expressions showed good agreement over a parameter range that spanned several orders of magnitude. Electron recirculation exterior to the Polywell device have been investigated in order to mitigate electron cusp losses. It was observed that without a positive bias placed on the Polywell coils the electron trajectories intersected with the vacuum chamber wall. Recirculating electrons spent approximately an order of magnitude longer outside the device compared to their internal confinement time. Also, the volume required to accommodate the recirculating electrons was calculated to be 90% of the vacuum chamber volume, using the optimum parameters used in the simulation. By modifying the cusp transmission probability to include the electrostatic repulsion effects of the repeller plates we derived new electron confinement time scaling laws. We also predict a significant improvement in the confinement time of electrons. Finally, we derived the electron power loss scaling laws for a thermalised distribution of electrons with and without electrostatic plugging. Also, space charge limited flow effects were considered in the cusp of the device.

Subjects/Keywords: Polywel; fusion; plasma; confinement; virtual; cathode

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gummersall, D. V. (2014). Scaling laws of electron confinement and power losses in zero and low beta Polywell devices . (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/13541

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Gummersall, David Vaughan. “Scaling laws of electron confinement and power losses in zero and low beta Polywell devices .” 2014. Thesis, University of Sydney. Accessed March 04, 2021. http://hdl.handle.net/2123/13541.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Gummersall, David Vaughan. “Scaling laws of electron confinement and power losses in zero and low beta Polywell devices .” 2014. Web. 04 Mar 2021.

Vancouver:

Gummersall DV. Scaling laws of electron confinement and power losses in zero and low beta Polywell devices . [Internet] [Thesis]. University of Sydney; 2014. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/2123/13541.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gummersall DV. Scaling laws of electron confinement and power losses in zero and low beta Polywell devices . [Thesis]. University of Sydney; 2014. Available from: http://hdl.handle.net/2123/13541

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

The Ohio State University

30. Choi, Hyunkyu. Perovskite-type oxide material as electro-catalysts for solid oxide fuel cells.

Degree: PhD, Chemical and Biomolecular Engineering, 2012, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1354652812

► Solid oxide fuel cells (SOFCs) are one of the most promising energy conversion devices for the next generation. This is mainly a result of the… (more)

▼ Solid oxide fuel cells (SOFCs) are one of the most promising energy conversion devices for the next generation. This is mainly a result of the low emission of environmental hazardous species associated with SOFC’s, high fuel conversion efficiency, and fuel flexibility. However, current ‘state-of-the art’ catalysts used in SOFCs are suffering from several drawbacks that encumber a commercial application of SOFCs in the direct conversion of hydrocarbons. In this application, high operating temperatures are required due to low oxygen reduction reaction (ORR) activity at the cathode, which limits the use of less expensive materials. In addition, ‘state of the art’ anode catalysts are very susceptible to sulfur poisoning and carbon depositions when it is operated with carbonaceous fuels. Since SOFCs aim to use the relatively abundant fuel sources, such as coal-derived syngas and natural gas, high activity and stable catalysts are required. Therefore, the need in developing and testing new catalysts formulations for both cathode and anode catalysts are crucial.The current research aims to find solutions for these problems through development of novel electro-catalysts based on perovskite materials. The objective is to develop perovskite materials which are capable of enhancing ORR activity as well as possessing a high tolerance to sulfur poisoning and carbon laydown. New formulations of cerium-doped perovskite material were synthesized with varying concentrations of cerium. The bulk structure, oxygen mobility, and electro-catalytic performance of the catalysts were examined using in-situ X-ray diffraction (XRD), oxygen temperature-programmed desorption (O2-TPD), X-ray absorption fine structure (XAFS), CO2 temperature programmed oxidation (TPO) and button cell/impedance measurements.Cerium-doped perovskites exhibit a cubic structure at room temperature and no apparent structural changes were observed with increasing temperature. An additional CeO2 phase was observed when cerium concentration exceeded 15% in the A-site of perovskite. Thermal compatibility of the catalyst gets closer to that of galdolinia-doped ceria (GDC) electrolyte by addition of cerium. Oxidation states of both Fe and Co were shown to be very close to their valence state with different cerium dopant levels at room temperature, indicating that the charge imbalance is compensated by the creation of oxygen vacancies. The oxygen vacancy was generated mainly from the reduction of Co where the Fe contribution was minimal. It was observed that the oxygen vacancy generation was inversely proportional to the dopant level of Ce. However, the electrocatalytic activity showed that the intermediate concentration of Ce doping has the best unit cell performance, which suggests that the secondary ceria phase at higher cerium dopant levels has a detrimental effect on the performance. The trend of the unit cell performance followed the CO2-TPO experiment results and found to be a good probe for button cell performance.On the anode side, the structural stability of the new… Advisors/Committee Members: Ozkan, Umit (Advisor).

Subjects/Keywords: Chemical Engineering; SOFC; perovskite; anode; cathode

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Choi, H. (2012). Perovskite-type oxide material as electro-catalysts for solid oxide fuel cells. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1354652812

Chicago Manual of Style (16^th Edition):

Choi, Hyunkyu. “Perovskite-type oxide material as electro-catalysts for solid oxide fuel cells.” 2012. Doctoral Dissertation, The Ohio State University. Accessed March 04, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1354652812.

MLA Handbook (7^th Edition):

Choi, Hyunkyu. “Perovskite-type oxide material as electro-catalysts for solid oxide fuel cells.” 2012. Web. 04 Mar 2021.

Vancouver:

Choi H. Perovskite-type oxide material as electro-catalysts for solid oxide fuel cells. [Internet] [Doctoral dissertation]. The Ohio State University; 2012. [cited 2021 Mar 04]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1354652812.

Council of Science Editors:

Choi H. Perovskite-type oxide material as electro-catalysts for solid oxide fuel cells. [Doctoral Dissertation]. The Ohio State University; 2012. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1354652812

		in
And / Or
		in
And / Or
		in
And / Or
		in

Open Access Theses and Dissertations