A pre-strain strategy of current collectors for suppressing electrode debonding in lithium-ion batteries

doi:10.1007/s10483-023-2976-9

Applied Mathematics and Mechanics (English Edition) ›› 2023, Vol. 44 ›› Issue (4): 547-560.doi: https://doi.org/10.1007/s10483-023-2976-9

A pre-strain strategy of current collectors for suppressing electrode debonding in lithium-ion batteries

Bo RUI^1,2,3, Bo LU^1,2,3,4, Yicheng SONG^1,2,3, Junqian ZHANG^1,2,3,4

1. Department of Mechanics, Shanghai Institute of Applied Mathematics and Mechanics, School of Mechanics and Engineering Science, Shanghai University, Shanghai 200444, China;
2. Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University, Shanghai 200444, China;
3. Shanghai Frontier Science Center of Mechanoinformatics, Shanghai University, Shanghai 200444, China;
4. Zhejiang Laboratory, Hangzhou 311100, China

收稿日期:2022-10-19 修回日期:2023-02-06 发布日期:2023-03-30
通讯作者: Bo LU, E-mail: bo lu@shu.edu.cn
基金资助:
the National Natural Science Foundation of China (Nos. 12072183, 11872236, and 12172205) and the Key Research Project of Zhejiang Laboratory of China (No. 2021PE0AC02)

A pre-strain strategy of current collectors for suppressing electrode debonding in lithium-ion batteries

Bo RUI^1,2,3, Bo LU^1,2,3,4, Yicheng SONG^1,2,3, Junqian ZHANG^1,2,3,4

1. Department of Mechanics, Shanghai Institute of Applied Mathematics and Mechanics, School of Mechanics and Engineering Science, Shanghai University, Shanghai 200444, China;
2. Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University, Shanghai 200444, China;
3. Shanghai Frontier Science Center of Mechanoinformatics, Shanghai University, Shanghai 200444, China;
4. Zhejiang Laboratory, Hangzhou 311100, China

Received:2022-10-19 Revised:2023-02-06 Published:2023-03-30
Contact: Bo LU, E-mail: bo lu@shu.edu.cn
Supported by:
the National Natural Science Foundation of China (Nos. 12072183, 11872236, and 12172205) and the Key Research Project of Zhejiang Laboratory of China (No. 2021PE0AC02)

摘要/Abstract

摘要： The interfacial debonding between the active layer and the current collector has been recognized as a critical mechanism for battery fading, and thus has attracted great efforts focused on the related analyses. However, much still remains to be studied regarding practical methods for suppressing electrode debonding, especially from the perspective of mechanics. In this paper, a pre-strain strategy of current collectors to alleviate electrode debonding is proposed. An analytical model for a symmetric electrode with a deformable and limited-thickness current collector is developed to analyze the debonding behavior involving both a pre-strain of the current collector and an eigen-strain of the active layers. The results reveal that the well-designed pre-strain can significantly delay the debonding onset (by up to 100%) and considerably reduce the debonding size. The critical values of the pre-strain are identified, and the pre-strain design principles are also provided. Based on these findings, this work sheds light on the mechanical design to suppress electrode degradation.

关键词: pre-strain, current collector, electrode debonding, lithium-ion battery (LIB), mechanically-based design

Abstract: The interfacial debonding between the active layer and the current collector has been recognized as a critical mechanism for battery fading, and thus has attracted great efforts focused on the related analyses. However, much still remains to be studied regarding practical methods for suppressing electrode debonding, especially from the perspective of mechanics. In this paper, a pre-strain strategy of current collectors to alleviate electrode debonding is proposed. An analytical model for a symmetric electrode with a deformable and limited-thickness current collector is developed to analyze the debonding behavior involving both a pre-strain of the current collector and an eigen-strain of the active layers. The results reveal that the well-designed pre-strain can significantly delay the debonding onset (by up to 100%) and considerably reduce the debonding size. The critical values of the pre-strain are identified, and the pre-strain design principles are also provided. Based on these findings, this work sheds light on the mechanical design to suppress electrode degradation.

Key words: pre-strain, current collector, electrode debonding, lithium-ion battery (LIB), mechanically-based design

中图分类号:

34B09

Bo RUI, Bo LU, Yicheng SONG, Junqian ZHANG. A pre-strain strategy of current collectors for suppressing electrode debonding in lithium-ion batteries[J]. Applied Mathematics and Mechanics (English Edition), 2023, 44(4): 547-560.

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A pre-strain strategy of current collectors for suppressing electrode debonding in lithium-ion batteries

A pre-strain strategy of current collectors for suppressing electrode debonding in lithium-ion batteries

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