【摘要】 基于电子计算机断层扫描数据搭建了锂离子电池介观尺度电化学-力耦合模型，模型还原了电极内部真实的结构并揭示了微观结构、参数对电极性能的影响。提高颗粒的固相扩散系数或降低粒径可以提高颗粒的锂化程度，从而提升电池的倍率性能；正极电解质膜阻的增加会加剧电极的极化。此外，放电倍率增加会导致电极颗粒锂化程度不均匀分布，造成更大的应力。介观尺度模型仿真结果对电极微观结构设计和材料选取有着重要的参考价值。更多还原

【Abstract】 This article presents a microstructure-resolved electrochemical-mechanical coupling model for lithium-ion batteries constructed based on X-ray nano computed tomography date. The model reconstructs the true internal structure of the electrode and reveals the influence of microstructure and parameters on electrode performance. Research has found that increasing the diffusion coefficient or reducing the particle size can effectively improve the lithiation degree of active material particles and enhance performance at high-rate discharge. Moreover, the increase in resistance of CEI membrane exacerbates electrode polarization. In addition, an increase in discharge rate can lead to uneven distribution of lithiation degree of active material particles, resulting in high internal stress. The simulation results of microstructure-resolved models can provide a basis for electrode microstructure design and material selection.更多还原