The active particle fracture is one of the major reasons for capacity fading in lithium ion batteries (LIBs). In this study, a model that couples Li-ion diffusion, stress evolution, and extended finite element method (X-FEM) is proposed to investigate the effects of central crack surface diffusion (CSD) in active particle. The different initial central crack length is adopted to simulate the crack evolution. The simulation results show the fracturing process occurs according to the following stages: no crack growth, stable crack growth, and unstable crack growth. When the influence of CSD is considered, the maximum principal tensile stress near the crack tip decreases and fracture of active particle becomes more difficult.
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