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

doi:10.1007/s10483-023-2976-9

Abstract

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

2010 MSC Number:

34B09

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

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References

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