PyR14PF6改善锂离子电池的高温性能  

Improving high temperature performance of Li-ion battery by PyR 14PF6

作　　者：蔡洪波 李玮珂 高可政 王力臻 CAI Hong-bo;LI Wei-ke;GAO Ke-zheng;WANG Li-zhen(Henan Lithium Power Source Co.,Ltd.,Xinxiang,Henan 453000,China;School of Material and Chemical Engineering,Zhengzhou University of Light Industry,Zhengzhou,Henan 450002,China)

机构地区：[1]河南锂动电源有限公司,河南新乡453000 [2]郑州轻工业大学材料与化学工程学院,河南郑州450002

出　　处：《电池》2020年第4期313-316,共4页Battery Bimonthly

基　　金：国家自然科学基金(21471135);河南省高等学校重点科研项目计划基础研究专项(20zx008)。

摘　　要：将N-甲基-丁基吡咯烷六氟磷酸盐(PyR 14 PF 6)作为离子液体添加剂加入1 mol/L LiPF 6/EC+EMC+MC电解液体系中,以改善锂离子电池的高温性能。PyR 14 PF 6的添加使循环伏安曲线的氧化还原峰电位差减小,充电电压平台降低、放电电压平台升高,电极容量保持率得到提高。组装的LiMn 2O 4/AC|Li电池在50℃下以2.0 C循环(3.0~4.3 V)200次,PyR 14 PF 6含量为2.5%时的容量保持率为83.44%,高于未添加PyR 14 PF 6时。The N-methyl-butylpyrrolidine hexafluorophosphate(PyR 14 PF 6)was added into the 1 mol/L LiPF 6/EC+EMC+MC electrolyte system as an ionic liquid additive to improve high temperature performance of Li-ion battery.The adding of PyR 14 PF 6 reduced the redox peak potential difference of the cyclic voltammetry curve,decreased the charging platform voltage,increased the discharging platform voltage,the capacity retention of the electrode was increased.When the assembled LiMn 2O 4/AC|Li battery was cycled 200 times with 2.0 C(3.0-4.3 V)at 50℃,the capacity retention ratio with 2.5%PyR 14 PF 6 was 83.44%,higher than that of without PyR 14 PF 6.

关 键 词：N-甲基-丁基吡咯烷六氟磷酸盐(PyR14PF 6) LiMn2O4/AC电极 离子液体 添加剂 

分 类 号：TM912.9[电气工程—电力电子与电力传动]