新能源汽车反钙钛矿型锂离子固态电解质掺杂改性研究  

Research on doping of lithium-ion conductive anti-perovskite solid electrolytes for new energy vehicle lithium-ion battery

作　　者：刘书琴[1] 刘军[2] 李志勇 LIU Shuqin;LIU Jun;LI Zhiyong(Yancheng Technician College Jiangsu Province,College of Automotive Engineering,Yancheng 224002,China;Jiangsu University,College of Automotive and Traffic Engineering,Zhenjiang 212013,China;Zhejiang Kaiying New Material Co.,LTD,Hangzhou 224002,China)

机构地区：[1]江苏省盐城技师学院汽车工程学院,江苏盐城224002 [2]江苏大学汽车与交通工程学院,江苏镇江212013 [3]浙江凯盈新材料有限公司,浙江杭州224002

出　　处：《粉末冶金工业》2023年第5期113-118,共6页Powder Metallurgy Industry

基　　金：浙江省自然科学基金资助项目(2020A01005)。

摘　　要：传统锂离子电池液态电解液具有可燃性,存在安全隐患。随着对二次电池安全性能要求的提升,固态电池近年来成为新型二次电池发展的热点。在所有类型的固体电解质中,反钙钛矿型电解质具有前驱体成本低廉,易于合成以及加工性能好的优点,因此引起了广泛的注意。然而,反钙钛矿型电解质的离子电导率较低,室温下仅为10^(-6)~10^(-5)S/cm,从而限制了其在新能源汽车上的应用。实验采用溴镁共掺杂的方法来提高反钙钛矿型电解质的离子电导率。通过溴掺杂氯位以及镁掺杂锂位能够引入更多的锂空位,从而降低了锂离子迁移的活化能,使反钙钛矿型电解质的离子电导率提升4.5倍。最后,以钴酸锂为正极活性材料组装金属锂固态电池,反钙钛矿基固态电池在2C倍率下循环100圈后容量保持率可达90.1%。The conventional liquid electrolyte of lithium-ion battery is flammable,which give rise to safety worries.With the increasing of safety requirements of secondary battery nowadays,solid-state battery has become a hot spot of new secondary battery in recent years.Among all kinds of solid electrolytes,the anti-perovskite electrolyte has attracted extensive attention because of its advantages of low-cost precursor,easy to be synthesized,and outstanding processability.However,the ionic conductivity of anti-perovskite electrolyte is low,which is only 10^(-6)~10^(-5)S/cm in room temperature,and limits its application in new energy vehicles.In this study,bromo-magnesium co-doping is used to improve the ionic conductivity of the anti-perovskite electrolyte.More lithium vacancies can be introduced by bromine doping on chlorine site and magnesium doping on lithium site,which reduces the activation energy of lithium-ion migration and increases the ionic conductivity of anti-perovskite electrolyte by4.5 times.Finally,solid state lithium metal battery is assembled with lithium cobalt oxides as active material.The capacity retention rate of the anti-perovskite based solid-state battery reaches to 90.1%after 100 cycles at2C rate.

关 键 词：反钙钛矿 锂离子 固体电解质 掺杂 离子电导率 

分 类 号：U469.7[机械工程—车辆工程] TM912[交通运输工程—载运工具运用工程]