宏观角度下有机电解质锂空气电池放电机理研究  

Study of discharge mechanism of organic electrolyte lithium air battery based on macro perspective

作　　者：崔建弘[1] 杨静宜[1] 张红梅[2] 杨俊岩 CUI Jianhong;YANG Jingyi;ZHANG Hongmei;YANG Junyan(Hebei College of Engineering,Shijiazhuang Hebei 050000,China;CETC13,Shijiazhuang Hebei 050000,China)

机构地区：[1]河北工程技术学院,河北石家庄050000 [2]中国电子科技集团公司第13研究所,河北石家庄050000

出　　处：《电源技术》2021年第5期582-584,614,共4页Chinese Journal of Power Sources

基　　金：2017河北省人社厅科学研究课题(JRS-2017-3123)。

摘　　要：从宏观角度建立了有机电解质锂空气电池放电模型,借助有限元方法分析了放电过程中过氧化锂沉淀形貌系数对放电电压的影响、正极厚度对比容量的影响、过氧化锂体积分数分布、有机电解质电流密度及电势的变化情况。结果可知,高放电电流情况下,电池放电电压随着过氧化锂沉淀形貌系数的降低而降低;减小正极电极厚度会提高电池的放电性能,但正极厚度较薄会降低正极中容纳沉积物的溶剂,减少电池容量;集流体近侧为放电反应的主要聚集区域,同时会生成较多的过氧化锂沉淀物,使得有机电解质电流密度骤降。该研究为锂空气电池放电机理的理解和放电性能的改进提供了参考。The discharge model of organic electrolyte lithium air battery was established from the macroscopic point of view.The influence of lithium peroxide precipitation morphology coefficient on discharge voltage,the influence of cathode thickness on capacity,the distribution of lithium peroxide volume fraction,the change of organic electrolyte current density and potential during the discharge process were analyzed by finite element method.The results are as follows:under the condition of high discharge current,the discharge voltage of the battery decreases with the decrease of the morphology coefficient of lithium peroxide precipitation;the discharge performance of the battery will be improved by reducing the thickness of the positive electrode,but the solvent containing the deposit in the positive electrode will be reduced and the battery capacity will be reduced due to the thinner cathode thickness;the main accumulation area of discharge reaction is near the collector,and more peroxide will be generated at the same time.Lithium precipitate makes the current density of organic electrolyte drop sharply.This study provides a reference for understanding the discharge principle and improving the discharge performance of lithium air battery.

关 键 词：锂空气电池 放电特性 宏观角度 有机电解质 

分 类 号：TM912[电气工程—电力电子与电力传动]