In Situ and Operando Morphology Study of Germanium–Selenium Alloy Anode for Lithium-Ion Batteries

Selenium-doped germanium (GeSe) micrometer-sized particles have been reported with good cycling performance and rate capability due to a Li–Se–Ge network formed during the first lithiation that provides a Li-ion fast pathway. To understand the effect of the Li–Se–Ge network at a high cycling rate, w...

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Bibliographic Details
Published in:ACS applied energy materials 2020-07, Vol.3 (7), p.6115-6120
Main Authors: Zhou, Xinwei, Li, Tianyi, Cui, Yi, Meyerson, Melissa L, Weeks, Jason A, Mullins, C. Buddie, Jin, Yang, Liu, Yuzi, Zhu, Likun
Format: Article
Language:English
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Summary:Selenium-doped germanium (GeSe) micrometer-sized particles have been reported with good cycling performance and rate capability due to a Li–Se–Ge network formed during the first lithiation that provides a Li-ion fast pathway. To understand the effect of the Li–Se–Ge network at a high cycling rate, we monitored the morphology change of both pure Ge and GeSe particles during cycling with an in situ/operando focused-ion beam-scanning electron microscope method. Our results showed that the proposed inactive Li–Se–Ge network can provide fast Li-ion transport and also buffer volume variation, resulting in homogeneous volume change and uniform microstructural evolution.
ISSN:2574-0962
2574-0962
DOI:10.1021/acsaem.0c01148