磷酸酯基高温电解液在锂金属二次电池中的应用  

Application of phosphate ester based high temperature electrolyte to lithium metal secondary batteries

作　　者：张红梅 廖丽[2] 王开琼 尹蒙蒙 徐星 ZHANG Hongmei;LIAO Li;WANG Kaiqiong;YIN Mengmeng;XU Xing(Nationwide Key Laboratory of Advanced Chemical Power Sources,Guizhou Meiling Power Source Co.,Ltd.,Zunyi Guizhou 563003,China;School of New Energy and Materials,Southwest Petroleum University,Chengdu Sichuan 610500,China)

机构地区：[1]贵州梅岭电源有限公司特种化学电源全国重点实验室,贵州遵义563003 [2]西南石油大学新能源与材料学院,四川成都610500

出　　处：《电源技术》2024年第8期1566-1571,共6页Chinese Journal of Power Sources

基　　金：自主创新项目(A342-JS02023-0001)。

摘　　要：采用双氟磺酰亚胺锂盐(LiFSI)和磷酸三丁酯(TBP)配制了高浓度电解液LiFSI/TBP,研究了其在锂金属电池应用中的高温电化学性能。通过阻燃、热重、拉曼等测试分析了电解液的物化性质,并组装CR2032型扣式电池考察了电解液在不同温度下的电化学性能。为了进一步评估电解液的实际应用,装配了1.4 Ah的18650型Li||LiFePO_(4)电池,在125℃以1/5 C倍率放电,循环10次后容量保持率为83.4%,展示出优异的高温电化学性能。A high concentration electrolyte LiFSI/TBP was prepared using lithium difluorosulfonamide(LiFSI)and tributyl phosphate(TBP),and its high-temperature electrochemical performance in lithium metal battery applications was studied.The physicochemical properties of the electrolyte were analyzed through tests such as flame retardant,thermogravimetry and Raman spectroscopy.The electrochemical performance of the electrolyte at different temperatures was investigated by assembling the CR2032 button type battery.In order to further evaluate the practical application of electrolytes,a 1.4 Ah 18650 Li||LiFePO4 battery was assembled.Discharged at a rate of 1/5 C at 125℃,the capacity retention rate is 83.4%after 10 cycles,demonstrating excellent high-temperature electrochemical performance.

关 键 词：锂金属二次电池 高温电解液 磷酸酯基电解液 高温性能 

分 类 号：TM912[电气工程—电力电子与电力传动]