(1. 中南大学 冶金与环境学院，长沙 410083；
2. 湖南艾华集团股份有限公司，益阳 413002)
摘 要: 基于COMSOL Multiphysics仿真平台，建立一维电化学模型，研究放电倍率、电解质中的扩散系数、电极厚度等对全固态锂离子电池放电性能的影响。结果表明：随着放电倍率的增加，电池内部的极化增大；在放电的各个时间段，电池内部的极化情况也在发生变化。当扩散系数增加至初始值的5倍时，负极/电解质界面与正 极/电解质界面的浓度梯度减小80%。电极厚度的变化影响扩散路径的长短，当电极厚度增加至原来的2倍时，1C放电时间缩短1.72%；电极厚度减小至原来的1/2时，1C放电时间增加0.46%。
关键字: 全固态锂离子电池；数值仿真；电化学模型；放电行为
（1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. Hunan Aihua Group Co., Ltd., Yiyang 413002, China）
Abstract:Based on COMSOL multiphysics simulation platform, one-dimensional electrochemical model was established to study the effect of discharge rate, electrolyte diffusion coefficient, and electrode thickness on the discharge performance of the all-solid-state Li-ion batteries. The results show that the polarization within the cells increases with the increase of the discharge rate, and in each period of discharge, the polarization inside the battery also changes. When the diffusion coefficient increases to 5 times of the initial value, the concentration gradient of negative electrode/ electrolyte interface and the positive electrode/electrolyte interface decreases by 80%. The electrode thickness changes affect the length of the diffusion path, when the electrode thickness increases to 2 times of the initial value, 1C discharge time decreases by 1.72%. When the electrode thickness decreases to 0.5 times of the initial value, 1C discharge time increases by 0.46%.
Key words: all solid state lithium ion battery; simulation; electrochemical model; discharge behavior
