Electro-Chemo-Mechanical Model for the Damage in Porous Electrodes of Lithium-Ion Batteries

An electro-chemo-mechanical model is developed for lithium-ion battery (LIB) considering the damage of active material (AM) particles. The established model is used to evaluate the effect of stress and the effect of damage on the electro-chemo-mechanical behavior of cathode. The cathode is generated with a random distribution method. Computational results show that moderate stress is beneficial for the battery performance, while damage generated by high stress can considerably degrade the battery capacity. The impact of several structural factors on the electro-chemo-mechanical behaviors of LIB are investigated. Smaller particles are found beneficial for the battery performance. Furthermore, the computational results also suggest that an increasing particle size from the separator to the current collector leads to higher capacity. The presented model helps to understand the electro-chemo-mechanical coupling mechanism of LIB.