基于电化学模型的全固态锂离子电池的放电行为  

Discharge behavior of all-solid-state Li-ion batteries based on electrochemical model

作　　者：洪树[1] 汤依伟[1] 贾明[1] 艾立华 殷宝华 李劼[1] 

机构地区：[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

出　　处：《中国有色金属学报》2015年第8期2176-2182,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51204211;51222403);中国博士后科学基金资助项目(2012M521543)

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%。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%.

关 键 词：全固态锂离子电池 数值仿真 电化学模型 放电行为 

分 类 号：TM911[电气工程—电力电子与电力传动]