电源技术2018，Vol.42Issue(1)：12-15,4.
LiPF6/LiFSI混合盐在高功率锂离子电池中的应用
LiPF6/LiFSI blend salt electrolyte for high-power lithium-ion batteries
李萌 1邱景义 2余仲宝 1张松通 2李冰川1
作者信息
- 1. 防化研究院军用化学电源研究与发展中心,北京100191
- 2. 先进化学蓄电技术与材料北京市重点实验室,北京100191
- 折叠
摘要
Abstract
LiPF6 and lithium bis (fluorosulfonyl)imide (LiFSI) were blended as lithium salt used in electrolyte of high-power lithium-ion batteries.Compared with LiPF6,LiFSI has higher ion conductivity and hydrolytic stability which may improve the power property and chemical stability of the electrolyte.The electrochemical behaviors of the blend salts in ethylene carbonate + dimethyl carbonate + ethylmethyl carbonate [(EC+DMC+EMC),ω(EC) ∶ ω(DMC) ∶ ω(EMC)=1 ∶ 1 ∶ 1],were investigated by potentiostatic polarization method,CV test and EIS test.The results show that the appropriate amount of LiFSI can increase the Li+ transference number and ion conductivity of electrolyte;the rever phase sibility of the two-charge/discharge reaction with LiFSI contained electrolyte systems is much better than pure LiPF6 electrolyte systems.Meanwhile,the results of impedance spectroscopy suggest that the addition of LiFSI has good influence on the LiFePO4 electrode surface.The result of discharge test at 1 C to 20 C shows that the rate performance of 18650 LiFePO4/AG battery is remarkably improved by blending LiFSI and LiPF6 salts compared to those of pure LiPF6-based electrolyte system,especially at 20 C.关键词
锂离子电池/高功率/电解液/LiFSI/LiPF6/混合盐Key words
lithium-ion battery/high power/electrolyte/LiFSI/LiPF6/blend salt分类
信息技术与安全科学引用本文复制引用
李萌,邱景义,余仲宝,张松通,李冰川..LiPF6/LiFSI混合盐在高功率锂离子电池中的应用[J].电源技术,2018,42(1):12-15,4.
