Phase field model of crack propagation and application in Lithium ion battery
Fracture of electrode materials (like Si) due to diffusion-induced stress during electrochemical cycling has been implicated as a possible mechanism for capacity fade and short cycle life.Recently,phase field modeling which is avoiding explicit front tracking by making material interfaces spatially diffuse has been a useful approach in understanding crack properties (like crack dynamics).This method is able to capture both the short scale physics of failure and macroscopic linear elasticity within a self-consistent set of equations.In this paper,we first make the phase field modeling of crack and explore the crack propagation laws.The analysis of the model has reproduced known crack propagation laws.Then we explore the crack pattern in the Si thin film electrode using the previous phase field model.Last,taking account of diffusion and diffusion-induced stress during electrochemical cycling,we make a multi-physical phase field model including concentration field,displacement field and phase field and use it to simulate the crack propagation in the charge and discharge process.
phase field fracture lithium ion battery
Peng Zuo Ya-Pu Zhao
State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China
国际会议
北京
英文
1-1
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）