Spatiotemporal mapping of microscopic strains and defects to reveal Li-dendrite-induced failure in all-solid-state batteries

Publication Type

Journal Article

Date Published

07/2022

Authors

DOI

Abstract

Solid-state electrolytes (SSEs) are key to the success and reliability of all-solid-state lithium batteries(link is external), potentially enabling improvements in terms of safety and energy density(link is external) over state-of-the-art lithium-ion batteries. However, there are several critical challenges to their implementation, including the interfacial instability stemming from the dynamic interaction of as-formed dendritic lithium during cycling. For this work, we emphasize the importance of studying the spatial distribution and temporal evolution(link is external) of strains and defects in crystalline solid-state electrolytes at the micro-scale, and how this affects dendrite growth. A proof-of-principle study is demonstrated using the synchrotron radiation(link is external) based micro Laue(link is external) X-ray diffraction method, and a custom-developed in-situ cycling device. Defects and residual strains(link is external) are mapped, and the evolution of intragranular misorientation(link is external) is observed. The feasibility of using this technique is discussed, and recommendations for micro-strain engineering to address the Li/SSEs interfacial issues are given. Also, work directions are pointed out with the consideration of combining multi-techniques for “poly-therapy”.

Journal

Materials Today

Volume

57

Year of Publication

2022

URL

ISSN

13697021

Organization