电池(电)
电极
扩散
恒流
材料科学
粒子(生态学)
工作(物理)
锂(药物)
锂离子电池
复合材料
拉伤
储能
常量(计算机编程)
压力(语言学)
化学
电流(流体)
热力学
地质学
物理化学
物理
计算机科学
功率(物理)
语言学
医学
程序设计语言
哲学
内分泌学
内科学
海洋学
作者
Yang‐Tse Cheng,Mark W. Verbrugge
标识
DOI:10.1016/j.jpowsour.2009.01.021
摘要
Lithium ion battery electrode materials generally experience significant volume changes during charging and discharging caused by concentration changes within the host particles. Electrode failure, in the form of fracture or decrepitation, may occur as a result of a highly localized stress, strain energy, and stress cycles over time. In this paper, we develop analytic expressions for the evolution of stress and strain energy within a spherically shaped electrode element under either galvanostatic (constant current) or potentiostatic (constant potential) operation when irreversible phenomena are dominated by solute diffusion resistance within host particles. We show that stresses and strain energy can evolve quite differently under potentiostatic vs. galvanostatic control. The findings of this work suggest the possibility of developing new battery charging strategies that minimize stress and strain energy and thus prolong battery life.
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