多物理
锂(药物)
联轴节(管道)
压力(语言学)
电化学
材料科学
淡出
离子
热的
复合材料
相间
机械
化学
电解质
有限元法
热力学
电极
计算机科学
物理
物理化学
哲学
内分泌学
有机化学
操作系统
生物
医学
遗传学
语言学
作者
Pengfei Luo,Peichao Li,Dezheng Ma,Keyong Wang,Hengyun Zhang
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2021-09-01
卷期号:168 (9): 090537-090537
被引量:11
标识
DOI:10.1149/1945-7111/ac24b5
摘要
This paper presents a capacity fade model of lithium-ion cell based on electrochemical-thermal-mechanical coupling, which incorporates the effect of stress on the capacity fade characteristic of lithium-ion cells. First, the electrochemical-thermal-mechanical coupling model of the cell is established and solved by COMSOL Multiphysics. Herein, the temperature-dependent dynamic parameters are introduced to more accurately describe the multi-field coupling feature of the cell during the operation. And the voltage, current, and stress distribution of the cell are obtained. Second, the lithium-ion loss due to the re-/formation of solid electrolyte interphase (SEI) is simulated and compared with the experiment in the literature. Next, the dependence of capacity characteristics on stress distribution is investigated in detail based on the presented model. We find that the electrochemical-thermal-mechanical coupling model has a higher side reaction rate than the classic electrochemical-thermal coupling model. Finally, the cell subject to external normal loads is modeled. The numerical results indicate that the tensile stress inhibits the side reaction, while the compressive stress promotes it. The findings in this paper are of benefit to understand the underlying mechanism of stress on the capacity fade.
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