A piperidinium-based ionic liquid electrolyte to enhance the electrochemical properties of LiFePO4 battery

被引：0
作者：
Tao Dong
Liang Zhang
Shimou Chen
Xingmei Lu
Suojiang Zhang
机构：
[1] Chinese Academy of Sciences,Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, Key Laboratory of Green Process and Engineering, Institute of Process Engineering
来源：
Ionics | 2015年 / 21卷
关键词：
Ionic liquid; Electrolyte; Lithium-ion battery; High rate and cyclic performance;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
A piperidinium-based ionic liquid, N-methylpiperidinium-N-acetate bis(trifluoromethylsulfonyl)imide ([MMEPip][TFSI]), was synthesized and used as an additive to the electrolyte of LiFePO4 battery. The electrochemical performance of the electrolytes based on different contents of [MMEPip][TFSI] has been investigated. It was found that the [MMEPip][TFSI] significantly improved the high-rate performance and cyclability of the LiFePO4 cells. In the optimized electrolyte with 3 wt% [MMEPip][TFSI], 70 % capacity can be retained with an increase in rate to 3.5 C, which was 8 % higher than that of electrolyte without [MMEPip][TFSI]. For the Li/LiFePO4 half-cells, after 100 cycles at 0.1 C, the discharge capacity retention was 78 % in the electrolyte without ionic liquid. However, in the electrolyte with 3 wt% [MMEPip][TFSI], it displayed a high capacity retention of 91 %. The good electrochemical performances indicated that the [MMEPip][TFSI] additive would positively enhance the electrochemical performance of LiFePO4 battery.
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页码：2109 / 2117
页数：8
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