基于COMSOL的锂电池离子电导率仿真研究

Ion Conductivity Simulation Research of Lithium Battery Based on COMSOL

摘要: 近年来，新能源汽车在全球蓬勃发展，锂离子电池的性能已成为新能源汽车行业发展的关键因素。倍率性能是锂离子电池非常重要的性能指标之一，而离子电导率就是影响倍率性能的主要参数。故本文主要从离子电导率对锂离子电池性能影响的角度出发，基于多物理场仿真软件COMSOL中的电化学与电池模块，建立了多孔电极及锂离子电池模型。模拟了离子在多孔电极中的有效传输，并仿真分析了锂离子电池的离子电导率对不同倍率放电时的放电容量、电池极化和内阻以及锂离子传输速率的影响。仿真结果显示，锂离子电池的离子电导率对锂离子电池电化学性能的性能影响较大，并且较高的离子电导率会改善锂离子电池的电化学性能。

Abstract: In recent years, new energy vehicles have developed rapidly worldwide, and the performance of lithium ion batteries has become a key factor affecting the development of the new energy vehicle industry. High rate performance is one of the most important performance indicators of lithium ion batteries, and ion conductivity is the main parameter affecting the high rate performance. In this paper, from the perspective of the impact of ionic conductivity on the performance of Li-ion batter-ies, porous electrode and lithium ion battery models were established by electrochemistry and battery modules based on COMSOL. The effective transport of ions in porous electrodes is simulated, and the effects of ionic conductivity of Li-ion battery on the discharge capacity, battery polarization, internal resistance and lithium ion transmission rate at different discharge rates were simulated and analyzed. The simulation results show that the ion conductivity of lithium ion battery has a great impact on the electrochemical performance of lithium ion battery, and higher ion conductivity will improve the electrochemical performance of lithium ion battery.