Performance of Piperidine Ionic Liquid Based Mixed Electrolyte in Li/LiCoO₂ Cell

Authors

Hu CHENG, School of Chemistry and Material Science, Key Lab for Functional Materials Chemistry of Guizhou Province, Guizhou Normal University, Guiyang 550001, ChinaFollow
Xiao-yan NIE, School of Chemistry and Material Science, Key Lab for Functional Materials Chemistry of Guizhou Province, Guizhou Normal University, Guiyang 550001, China
Ye-dan SHEN, School of Chemistry and Material Science, Key Lab for Functional Materials Chemistry of Guizhou Province, Guizhou Normal University, Guiyang 550001, China

Corresponding Author

Hu Cheng(chenghu8802@163.com)

Abstract

The N-methyl-N-ethyl (propyl, butyl) piperidinium bis (trifluo romethanesulfonyl) imide (PP12(3,4)TFSI) ionic liquids were prepared, and their influences on the performances of Li/LiCoO₂ cells were investigated. The electrochemical performance and thermostability of ionic liquids based mixed electrolytes were characterized by electrochemical methods and thermogravimetric analysis. The results showed that the piperidine ionic liquids could improve the thermostability of organic electrolyte, and the size of their side chain had played an important role on the electrochemical performance of Li/LiCoO₂ cell. The Li/LiCoO₂ cell used the electrolyte mixed with PP13TFSI exhibited the best electrochemical performance among the three ionic liquids. The initial discharge capacity reached 156.9 mAh·g^-1 at the rate of 150 mA·g-1 and 3.0 ~ 4.35 V. The discharge capacity upon 200 cycles was 133.9 mAh·g^-1, and the capacity retention was 85.5%. The cycle performance was much better than that in conventional organic electrolytes.

Graphical Abstract

Keywords

ionic liquid, LiCoO2, electrolyte, electrochemical performance

DOI Link

https://doi.org/10.13208/j.electrochem.160218

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Publication Date

2017-02-28

Online Available Date

2016-03-14

Revised Date

2016-03-04

Received Date

2016-02-18

Recommended Citation

Hu CHENG, Xiao-yan NIE, Ye-dan SHEN. Performance of Piperidine Ionic Liquid Based Mixed Electrolyte in Li/LiCoO₂ Cell[J]. Journal of Electrochemistry, 2017 , 23(1): 160218.
DOI: 10.13208/j.electrochem.160218
Available at: https://jelectrochem.xmu.edu.cn/journal/vol23/iss1/16