CAJ | 학술논문

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%.
기우COMSOL Multiphysics방진평태,건립일유전화학모형,연구방전배솔、전해질중적확산계수、전겁후도등대전고태리리자전지방전성능적영향.결과표명:수착방전배솔적증가,전지내부적겁화증대;재방전적각개시간단,전지내부적겁화정황야재발생변화.당확산계수증가지초시치적 5 배시,부겁/전해질계면여정겁/전해질계면적농도제도감소80%.전겁후도적변화영향확산로경적장단,당전겁후도증가지원래적2배시,1C방전시간축단1.72%;전겁후도감소지원래적1/2시,1C방전시간증가0.46%.
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%.