论文标题
锂离子电池电极颗粒引起的裂缝的杂交相模型
A Hybrid Phase Field Model for Fracture Induced by Lithium Diffusion in Electrode Particles of Li-ion Batteries
论文作者
论文摘要
高能量密度和轻质设计的锂离子电池（LIB）在电子设备和系统中发现了广泛的应用。对于具有高容量电极（例如Silicon（SI））的LIB而言，由静电片引起的降解机制是一个主要的挑战性问题，最终可以降低电池的寿命。在本文中，提出了混合相位场模型（PFM）来研究自由电极的断裂行为。该模型考虑了锂（Li）-ION扩散过程，应力演化和裂纹传播之间的耦合效应。同样，考虑弹性特性对锂离子浓度幅度的依赖性。详细阐述了基于MATLAB有限元（FE）代码的数值实现。然后，将提出的混合PF方法应用于纳米线（NW）Si电极粒子。结果表明，与各向同性模型相比，混合模型的破裂生长趋势较小。
Lithium-ion batteries (LIBs) of high energy density and light-weight design, have found wide applications in electronic devices and systems. Degradation mechanisms that caused by lithiation is a main challenging problem for LIBs with high capacity electrodes like silicon (Si), which eventually can reduce the lifetime of batteries. In this paper, a hybrid phase field model (PFM) is proposed to study the fracture behavior of LIB electrodes. The model considers the coupling effects between lithium (Li) -ion diffusion process, stress evolution and crack propagation. Also, the dependency of Elastic properties on the concentration magnitude of Li-ion is considered. A numerical implementation based on a MATLAB finite element (FE) code is elaborated. Then, the proposed hybrid PF approach is applied to a Nanowire (NW) Si electrode particle. It is shown that the hybrid model shows less tendency to crack growth than the isotropic model.
