Mechanical failure of garnet electrolytes during Li electrodeposition observed by in-operando microscopy
File(s)
Accepted version
Author(s)
Type
Journal Article
Abstract
Metallic Li anodes are key to reaching high energy densities in next-generation solid-state batteries, however, major problems are the non-uniform deposition of Li at the interface and the penetrative power of Li metal during operation, which cause failure of the ceramic electrolyte, internal short-circuits and a premature end of battery life. In this work, we explore the anode-electrolyte interface instability of a Li metal-garnet electrolyte system during Li electrodeposition, and its implications for mechanical fracture, Li metal propagation, and electrolyte failure. The degradation mechanism was followed step-by-step during in-operando electrochemical cycling using optical and scanning electron microscopy. High amounts of Li electrodeposition in a localized zone of the interface lead to ceramic fracture followed by an electrode-to-electrode electrical connection via a conductor Li metal filament. This work enables deeper understanding of battery failure modes in all-solid-state batteries containing a ceramic electrolyte membrane.
Date Issued
2019-02-01
Date Acceptance
2018-11-11
Citation
Journal of Power Sources, 2019, 412, pp.287-293
ISSN
0378-7753
Publisher
Elsevier
Start Page
287
End Page
293
Journal / Book Title
Journal of Power Sources
Volume
412
Copyright Statement
© 2018 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Engineering & Physical Science Research Council (E
Grant Number
EP/M014142/1
RG84223
EP/R024006/1
Subjects
09 Engineering
03 Chemical Sciences
Energy
Publication Status
Published
Date Publish Online
2018-11-29