Mechanical behavior and structure of lithium-ion battery electrode calendering process

doi:10.19799/j.cnki.2095-4239.2023.0954

Abstract

Abstract:

Calendering is a crucial step in the electrode preparation process for lithium-ion batteries, significantly impacting the battery's consistency and safety. Given that the electrode is a composite material comprising a current collector (metal) and a coating (nonmetal), the complexity of the calendering deformation mechanism is heightened. In this study, we employed the discrete element method (DEM) model to characterize the coating component of the cathode electrode in a lithium battery, simulating the electrode calendering process numerically. Cathode electrodes were prepared, and experiments with varying calendering degrees were conducted. The congruence between the numerical simulations and experimental outcomes validates the model's accuracy. This research delves into the electrode's morphological evolution throughout the calendering process, unveiling the fundamental nature of calendering deformation. It also quantifies the load at the interface between the coating and the current collector during calendering, providing an in-depth interface analysis. The findings indicate that the DEM model can effectively simulate the microstructural evolution and actual mechanical behavior of the electrode. As the rolling reduction increases, the maximum stress on the current collector exhibits a linear rising trend. The enhanced compactness among the active particles in the coating is identified as the primary cause of calendering deformation. Some active particles in the coating become embedded in the current collector's surface, causing noticeable plastic deformation and stress concentration. This investigation offers innovative research perspectives and valuable insights for further exploration of the electrode calendering process.

Key words: lithium-ion battery, electrode calendaring, discrete element method

CLC Number:

TM 912

Xinbing XIE, Kaiyue YANG, Xiaozhong DU. Mechanical behavior and structure of lithium-ion battery electrode calendering process[J]. Energy Storage Science and Technology, 2024, 13(5): 1699-1706.

Figures/Tables 10

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材料	参数	数值
活性物质颗粒 (NCM)	杨氏模量/Pa	1.42×10¹¹
	密度/(g/cm³)	4.75
	泊松比	0.25
	静摩擦系数	0.25
	滚动摩擦系数	0.01
	弹性恢复系数	0.25

导电炭黑 (CB)	杨氏模量/Pa	4.5×10⁸
	密度/(g/cm³)	2.25
	泊松比	0.3
	静摩擦系数	0.25
	滚动摩擦系数	0.01
	弹性恢复系数	0.25

集流体 (铝)	杨氏模量/Pa	6.89×10¹⁰
	密度/(g/cm³)	2.7
	泊松比	0.25

压缩板	杨氏模量/Pa	1.82×10¹¹
	密度/(g/cm³)	7.8
	泊松比	0.3

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