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Title The effect of ion transport and electrolyte rheology on morphological instabilities in electrodeposition
URL
Publication Date
Date Accessioned
Degree PhD
Discipline/Department Mechanical Engineering
Degree Level doctoral
University/Publisher Cornell University
Abstract Morphological instabilities in electrodeposition have long been studied due to their important applications in electroplating and energy storage. They are receiving increased attention due to their prevalence in batteries with lithium metal anodes which are critical to next generation energy storage devices. These instabilities are driven by preferential charge transport across an electrolyte to the tips of perturbations to the metal surface. Using linear stability analysis, four models are developed to study the growth of morphological instabilities in electrodeposition under the action of various driving forces. The first model considers the ion transport across an electrolyte with fixed anions and demonstrates that spatial immobilization of anions can significantly reduce the electric field at the metal surface. The following model develops a framework to include the mechanical response of an elastic solid separator, which is then used to show that the combined effect of reduced electric field and elasticity-induced suppression can stabilize the deposition at all length scales. The next idea investigates the effect of an interfacial layer and yields that homogenization of cation concentration at the metal surface by lateral transport can weaken the growth of the instability. Finally, polymer additives are studied as a means to stabilize electroconvection-induced destabilization of the metal surface.
Subjects/Keywords Chemical engineering; Mechanical engineering; electroconvection; electrodeposition; instabilities; lithium dendrite; Lithium Battery; Electrolyte
Contributors Koch, Donald L. (chair); Kirby, Brian (committee member); Archer, Lynden A. (committee member)
Language en
Country of Publication us
Record ID handle:1813/56970
Repository cornell
Date Retrieved
Date Indexed 2020-09-09
Grantor Cornell University
Issued Date 2017-08-30 00:00:00

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