有机电解质锂空气电池放电特性分析  

Discharge Mechanism of Lithium-Air Battery With Organic Electrolyte

作　　者：孙红[1] 任海超 李洁 张添昱 吴玉厚[1] SUN Hong;REN Hai-Chao;LI Jie;ZHANG Tian-Yu;WU Yu-Hou(School of Alechanical Engineering,Shenyang Jianzhu University,Shenyang 110168,China)

机构地区：[1]沈阳建筑大学机械工程学院,沈阳110168

出　　处：《工程热物理学报》2020年第4期907-912,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51776131)。

摘　　要：为了研究有机电解质锂空气电池放电过程的内部反应机理,本文以有限元方法为基础,利用有限元软件COMSOL建立了一个耦合了Butler-volmer方程、Fick定律方程、偏微分方程的二维数值模型,研究有机电解质锂空气电池放电过程中的传质规律,分析了沉积物形貌、正极多孔材料厚度对电池放电特性的影响,在一定放电电流密度下,小的过氧化物沉淀形貌系数导致放电电压降低,降低正极厚度有利于电池的放电特性,靠近正极集流体附近电化学反应剧烈,但生成的过氧化物多,阻塞在靠近正极集流体一侧,导致电流密度迅速降低,研究结果对理解有机电解质锂空气电池的工作原理具有重要帮助.The internal reaction mechanism of organic electrolyte lithium-air battery discharge process was studied.In this paper,based on the finite element method,a two-dimensional numerical model coupled with Butler-Volmer equation,Fick’s law equation and partial differential equation is established using the finite element software COMSOL to study the mass transfer law in discharge process of organic electrolyte lithium-air batteries.The effects of sediment morphology and thickness of positive porous material on the discharge characteristics of the battery were analyzed.Under a certain discharge current density,the small peroxide precipitation morphology factor lead to a decrease in the discharge voltage and a decrease in the thickness of the positive electrode which is favorable for the discharge characteristics of the battery.Near the cathode collector near the electrochemical reaction is intense,but the formation of more peroxide,blocking in the cathode collector near the side,to cause a rapid decrease in current density.The results of the study are important for understanding the working principle of organic electrolyte lithium-air batteries.

关 键 词：锂空气电池 过氧化物 电流密度 电势 

分 类 号：TM911[电气工程—电力电子与电力传动]