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Description:

An operando bimodal atomic force microscopy system was constructed to perform nanomechanical mapping of an amorphous Si thin film electrode deposited on a Li6.6La3Zr1.6Ta0.4O12 solid electrolyte sheet during electrochemical lithiation/delithiation. The evolution of Young’s modulus maps of the Si electrode was successfully tracked as a function of apparent Li content x in lithium silicide (LixSi) simultaneously with real-time surface topography observation. At the initial stage of lithiation, the average modulus steeply decreased due to the generation of LixSi from intrinsic Si, followed by a moderate modulus reduction until the electrode capacity reached 3300 mAh g–1 (Li content x = 3.46). In the following delithiation, the gradual recovery of the average modulus of LixSi was observed up to 1467 mAh g–1 (Li content x = 1.54) at which delithiation stopped due to the significant volume change induced by phase transformation of LixSi.

Rights:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: Atomic force microscopy (AFM), all-solid-state lithium ion batteries, operando/in situ, nanomechanical mapping

Date published: 2024-01-18

Publisher: American Chemical Society (ACS)

Journal:

• The Journal of Physical Chemistry Letters (ISSN: 19487185) vol. 15 issue. 2 p. 490-498

Funding:

• Ministry of Education, Culture, Sports, Science and Technology JPMXP0219207397
• Japan Science and Technology Agency JPMJPF2016

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1021/acs.jpclett.3c03012

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Updated at: 2024-08-27 08:30:20 +0900

Published on MDR: 2024-08-27 08:30:20 +0900