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A finite deformation stress-dependent chemical potential and its applications to lithium ion batteries

机译:有限变形应力相关化学势及其在锂离子电池中的应用

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摘要

This paper reports the development or a new stress-dependent chemical potential for solid state diffusion under multiple driving forces including mechanical stresses. The new stress-dependent chemical potential accounts for nonlinear, inelastic, and finite deformation. By using this stress-dependent chemical potential, insertion and extraction of lithium ions into a silicon particle is investigated. The distribution and evolution of diffusion-induced stress during the insertion/extraction processes are numerically calculated. Critical particle size is obtained as a function of the charging/discharging rates. It is also found that when plastic deformation occurs, the hoop stresses on the particle surface, contrary to intuition, can become positive even during the charging process, which may explain some of the recent experimental observations.
机译:本文报道了在多种驱动力(包括机械应力)下固态扩散的应力依赖性化学势的发展或新趋势。新的应力相关化学势可解释非线性,非弹性和有限变形。通过使用这种依赖于应力的化学势,研究了锂离子向硅颗粒的插入和提取。数值计算了在插入/拔出过程中扩散引起的应力的分布和演变。获得临界粒径,该临界粒径是充电/放电速率的函数。还发现,当发生塑性变形时,与直觉相反,粒子表面上的环向应力甚至在充电过程中也可能变为正,这可以解释最近的一些实验观察结果。

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