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Title: Strong Kinetics-stress Coupling In Lithiation Of Si And Ge Anodes

Coupling between transport kinetics of chemical participants and mechanical stress is a universal phenomenon in numerous chemo-physical processes. In this Letter, we present a set of in-situ transmission electron microscopy studies along with atomistically informed continuum mechanics modeling to evidence the strong coupling between lithiation kinetics and stress generation and failure of Si and Ge electrodes. On the one hand, we show that anisotropic lithiation in crystalline Si (c-Si) leads to anisotropic swelling and surface fracture, in contrast to isotropic lithiation, isotropic swelling, and tough behavior in c-Ge and amorphous Si (a-Si). On the other, we demonstrate that lithiation self-generated stress leads to lithiation retardation and externally applied bending breaking the lithiation symmetry in c-Ge nanowires. Our studies shed lights on the design of durable high-performance lithium ion batteries.
Authors:
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Publication Date:
OSTI Identifier:
1188906
Report Number(s):
PNNL-SA-107498
48379
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Extreme Mechanics Letters, 2:1-6
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
Environmental Molecular Sciences Laboratory