Mechanical failure of garnet electrolytes during Li electrodeposition observed by in-operando microscopy

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Title: Mechanical failure of garnet electrolytes during Li electrodeposition observed by in-operando microscopy
Authors: Manalastas, W
Rikarte, J
Chater, RJ
Brugge, R
Aguadero, A
Buannic, L
Llordés, A
Aguesse, F
Kilner, J
Item 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.
Issue Date: 1-Feb-2019
Date of Acceptance: 11-Nov-2018
URI: http://hdl.handle.net/10044/1/65487
DOI: https;//dx.doi.org/10.1016/j.jpowsour.2018.11.041
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/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/M014142/1
RG84223
EP/R024006/1
Keywords: 09 Engineering
03 Chemical Sciences
Energy
Publication Status: Published
Embargo Date: 2019-11-29
Online Publication Date: 2018-11-29
Appears in Collections:Faculty of Engineering
Materials



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