高熵电解液体系改善低温锂离子电池性能研究  

The performance research of low-temperature lithium-ion batteries improved by high-entropy electrolyte system

作　　者：郎集会[1] 刘禹含 徐敬尧 LANG Ji-hui;LIU Yu-han;XU Jing-yao(College of Physics,Jilin Normal University,Siping 136000,China;School of Materials Science and Engineering,Jilin University,Changchun 130022,China)

机构地区：[1]吉林师范大学物理学院,吉林四平136000 [2]吉林大学材料科学与工程学院,吉林长春130022

出　　处：《吉林师范大学学报（自然科学版）》2024年第2期69-77,共9页Journal of Jilin Normal University:Natural Science Edition

基　　金：国家自然科学基金项目(22078124,22378158);吉林省科技发展计划项目(20230508040RC,20210203014SF)。

摘　　要：为了开发工作温度更低的锂离子电池电解液,采用增加电解液混合物熵值的方法制备了包括四种锂盐在内的锂离子电池电解液.研究结果表明,电解液熵值的增加改善了电池在低温环境下的使用性能,拓宽了工作范围.锂盐作为电解液的核心组成之一,其性质直接影响电池的性能.多种锂盐组成的混合电解液可以改善电解液的溶剂化结构,提高锂盐的溶解度进而稳定电极与电解液之间的界面.制备的高熵电解液显著提高了锂电池的循环性能和倍率性能,在-20℃下高熵电解液体系的电池循环性能远大于常用的LiPF_(6)作为锂盐的BASE电解液的电池性能.In order to develop electrolytes for lithium-ion batteries with low operating temperatures,lithium-ion battery electrolyte including four lithium salts were prepared by increasing the entropy value of the electrolyte mixture in this work.The results show that the increase in the entropy value of the electrolyte improves the performance of the battery in low-temperature environments and broadens the working range.As one of the core components of the electrolyte,the properties of lithium salt directly affect the characteristics of the battery.A mixed electrolyte composed of multiple lithium salts can improve the electrolyte solvation structure of the electrolyte,increase the solubility of lithium salts and thus stabilize the interface between the electrode and electrolyte.The prepared high-entropy electrolyte significantly improves the cycle performance and rate performance of lithium batteries,and the cycle performance of the high-entropy electrolyte system is much better than that of the commonly used BASE electrolyte with LiPF_(6) as the lithium salt at-20℃.

关 键 词：高熵电解液 低温电池 锂二次电池 

分 类 号：TQ152[化学工程—电化学工业]