电池2023，Vol.53Issue(6)：605-609,5.DOI:10.19535/j.1001-1579.2023.06.004
FEC对不同混盐电解液体系的影响
Effect of FEC on electrolytic liquid systems with different mixed salts
摘要
Abstract
The use of a small amount of additives could improve the low-temperature performance of Li-ion battery.The electrolyte system constructed with different lithium salts[lithium tetrafluoroborate(LiBF4),lithium difluoroxalate borate(LiODFB)]and additives[fluoroethylene carbonate(FEC)]with solvent EC+PC+EMC+EA(volume ratio 1∶1∶1∶2)was used to test the electrochemical performance of LiCoO2/Li half cell.The initial charge-discharge,rate capability,cycle performance,cyclic voltametric(CV)curves,electrochemical impedance spectroscopy(EIS),SEM and(XPS)of the cells were examined.The optimal amount of FEC addition was 3%(mass fraction).At-20℃,the specific discharge capacity of the battery assembled with 0.5 mol/L LiBF4+0.5 mol/L LiODFB/PC+EC+EMC+EA+3%FEC system was 113.5 mAh/g after 50 cycles in 2.7-4.2 V at 0.1 C,the capacity retention rate was 96.34%,higher than that of the battery assembled without FEC electrolyte.The addition of a certain amount of FEC could improve the specific discharge capacity of the electrolyte system and the cycling stability of the battery at low temperature.关键词
氟代碳酸乙烯酯(FEC)/二氟草酸硼酸锂(LiODFB)/混盐/钴酸锂(LiCoO2)Key words
fluoroethylene carbonate(FEC)/lithium difluoroxalate borate(LiODFB)/mixed salt/lithium cobaltate(LiCoO2)分类
信息技术与安全科学引用本文复制引用
张丽娟,何劲作,辛娟,闫啸..FEC对不同混盐电解液体系的影响[J].电池,2023,53(6):605-609,5.基金项目
青海省自然科学基金青年项目(2019-ZJ-938Q),青海民族大学研究生创新项目(12M2022004),青海民族大学大学生创新创业训练计划项目(DCXM-2022-05) （2019-ZJ-938Q）
