Constitutive equations for self-limiting lithiation of electrode nanoparticles in Li-ion batteries

被引：19

作者：

Drozdov, A. D. ^{[1
]}

机构：

[1] Danish Technol Inst, Ctr Plast Technol, DK-2630 Taastrup, Denmark

来源：

MECHANICS RESEARCH COMMUNICATIONS | 2014年 / 57卷

关键词：

Lithium ion battery; Stress-induced diffusion; Viscoplasticity; Modeling; IN-SITU TEM; DIFFUSION-INDUCED STRESSES; SIZE-DEPENDENT FRACTURE; CRYSTALLINE SILICON; ELECTROCHEMICAL LITHIATION; INITIAL LITHIATION; AMORPHOUS-SILICON; PHASE-TRANSITION; LITHIUM; PLASTICITY;

D O I：

10.1016/j.mechrescom.2014.03.002

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

Constitutive equations are developed for the viscoplastic response of a host medium induced by diffusion of guest atoms. These relations are applied to analyze formation of stresses in spherical electrode particles under lithiation. Ability of the model to describe basic phenomena observed in experiments (formation of a sharp interphase between a Li-poor core and a Li-rich shell, growth of tensile hoop stresses at the outer surface of a particle leading to its fracture, and slowing down of the interphase motion) is revealed by numerical simulation. Good agreement is demonstrated between observations on interphase propagation in amorphous silicon nanoparticles and predictions of the model. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：67 / 73

页数：7

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