University of Colorado
Whiteley, Justin Michael.
Design and Materials Innovations in Emergent Solid Batteries.
Degree: PhD, Mechanical Engineering, 2016, University of Colorado
Emergent technologies, such as electric vehicles and grid energy storage, are driving iterations of the lithium-ion battery (LIB) to exhibit enhanced safety and higher temperature capabilities. The commercial LIB based on organic liquid electrolytes presents a variety of safety concerns most notably flammability. Batteries encompassing inorganic solid electrolytes, known as solid-state batteries, have attracted significant attention in recent years due to resolution of overheating and thermal runaway, as well as lithium-ion conductivities matching liquids yet still maintaining a lithium transference number of unity. With commercial deployment rapidly approaching, solid-state research has been intensified to resolve many of the problems introduced once a liquid is replaced with a solid.
The most challenging problems presented in solid-state batteries are interfaces. These interfaces are present on a variety of length scales: between lithium and electrolyte, electrolyte and binder, active material and conductive additives, and within the active material itself. To mitigate many of the interfacing problems, a materials and/or engineering design approach is employed dependent upon the situation.
Fundamentals of electrolytic stability, particularly with Li10
, against metallic lithium are explored including the effects of the decomposition layer on battery performance. Mixed conductors, such as tin and TiS2
, are used for amplifying reaction area and simplifying charge transfer when interfacing with the active materials of silicon and FeS2
, respectively. A new design approach is demonstrated on producing thin solid membranes utilizing a self-healing polymer to form an in-situ polymeric matrix for mechanical strength and enhanced conductance. The new membrane is demonstrated as a self-optimizing interface to suppress the formation of lithium metal dendrites. In the final chapter, the solid interfaces are taken advantage of to demonstrate a new phenomenon of charge storage that is only present in the solid-state - pseudocapacitance in disordered LiTiS2
Advisors/Committee Members: Sehee Lee, Heather Platt, Conrad Stoldt, Ronggui Yang, Wei Zhang.
Subjects/Keywords: lithium battery; lithium dendrite; pseudocapacitance; self healing polymer; solid electrolyte; solid state battery; Inorganic Chemistry; Materials Science and Engineering; Power and Energy
to Zotero / EndNote / Reference
APA (6th Edition):
Whiteley, J. M. (2016). Design and Materials Innovations in Emergent Solid Batteries. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/mcen_gradetds/130
Chicago Manual of Style (16th Edition):
Whiteley, Justin Michael. “Design and Materials Innovations in Emergent Solid Batteries.” 2016. Doctoral Dissertation, University of Colorado. Accessed September 28, 2020.
MLA Handbook (7th Edition):
Whiteley, Justin Michael. “Design and Materials Innovations in Emergent Solid Batteries.” 2016. Web. 28 Sep 2020.
Whiteley JM. Design and Materials Innovations in Emergent Solid Batteries. [Internet] [Doctoral dissertation]. University of Colorado; 2016. [cited 2020 Sep 28].
Available from: https://scholar.colorado.edu/mcen_gradetds/130.
Council of Science Editors:
Whiteley JM. Design and Materials Innovations in Emergent Solid Batteries. [Doctoral Dissertation]. University of Colorado; 2016. Available from: https://scholar.colorado.edu/mcen_gradetds/130