The origin of chemical inhomogeneity in garnet electrolytes and its impact on the electrochemical performance
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
The interface between solid electrolytes and lithium metal electrodes determines the performance of an all-solid-state battery in terms of the ability to demand high power densities and prevent the formation of lithium dendrites. This interface depends strongly on the nature of the solid electrolyte surface in contact with the metallic anode. In the garnet electrolyte/Li system, most papers have focused on the role of current inhomogeneities induced by void formation in the Li metal electrode and the presence of insulating reaction layers following air exposure. However, extended defects in the solid electrolyte induced by chemical and/or structural inhomogeneities can also lead to uneven current distribution, impacting the performance of these systems. In this work, we use complementary surface analysis techniques with varying analysis depths to probe chemical distribution within grains and grain boundaries at the surface and in the bulk of garnet-type electrolytes to explain their electrochemical performance. We show that morphology, post-treatments and storage conditions can greatly affect the surface chemical distribution of grains and grain boundaries. These properties are important to understand since they will dictate the ionic and electronic transport near the interfacial zone between metal and electrolyte which is key to determining chemo-mechanical stability.
Date Issued
2020-07-28
Date Acceptance
2020-07-02
Citation
Journal of Materials Chemistry A, 2020, 8 (28), pp.14265-14276
ISSN
2050-7488
Publisher
Royal Society of Chemistry
Start Page
14265
End Page
14276
Journal / Book Title
Journal of Materials Chemistry A
Volume
8
Issue
28
Copyright Statement
© The Royal Society of Chemistry 2020. This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence http://creativecommons.org/licenses/by-nc/3.0/.
License URL
Sponsor
Engineering & Physical Science Research Council (E
Engineering & Physical Science Research Council (E
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000551538000039&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Grant Number
RG84223
UOB092952
Subjects
Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Energy & Fuels
Materials Science, Multidisciplinary
Chemistry
Materials Science
INTERFACIAL RESISTANCE
SURFACE-CHEMISTRY
LITHIUM
AL
STABILITY
CONSEQUENCES
OXIDE
PEAK
XPS
Publication Status
Published
Date Publish Online
2020-07-03