(1. 中南大學(xué) 冶金與環(huán)境學(xué)院，長沙 410083；
2. 湖南艾華集團股份有限公司，益陽 413002)
摘 要: 基于COMSOL Multiphysics仿真平臺，建立一維電化學(xué)模型，研究放電倍率、電解質(zhì)中的擴散系數(shù)、電極厚度等對全固態(tài)鋰離子電池放電性能的影響。結(jié)果表明：隨著放電倍率的增加，電池內(nèi)部的極化增大；在放電的各個時間段，電池內(nèi)部的極化情況也在發(fā)生變化。當(dāng)擴散系數(shù)增加至初始值的5倍時，負極/電解質(zhì)界面與正 極/電解質(zhì)界面的濃度梯度減小80%。電極厚度的變化影響擴散路徑的長短，當(dāng)電極厚度增加至原來的2倍時，1C放電時間縮短1.72%；電極厚度減小至原來的1/2時，1C放電時間增加0.46%。
關(guān)鍵字: 全固態(tài)鋰離子電池；數(shù)值仿真；電化學(xué)模型；放電行為
（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
