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Acta Phys. Chim. Sin.  2015, Vol. 31 Issue (7): 1351-1358    DOI: 10.3866/PKU.WHXB201505121
Synthesis and Electrochemical Performance of Plastic Crystal Compound-Based Ionic Liquid
ZENG Yu-Qun, GUO Yong-Sheng, WU Bing-Bin, HONG Xiang, WU Kai, ZHONG Kai-Fu
Research Institute, Ningde Amperex Technology Limited, Ningde 352100, Fujian Province, P. R. China
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Highly pure plastic crystal, 1-ethyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide (P12TFSI), was synthesized and purified by an easily industrializable recrystallization method. The P12TFSI/LiFSI ionic liquid was obtained by mixing P12TFSI with 30% (molar fraction, x) LiFSI. Electrochemical characterization methods including cyclic voltammetry, constant voltage polarization and charge/discharge at constant current were used to investigate the electrochemical window, stability vs Al corrosion, and battery performance of the ionic liquid.Awide electrochemical window of 5.00 V, non-corrosion of theAl current collector, and 0.92mS·cm-1 of ionic conductivity at room temperature were observed. LiCoO2/Li batteries assembled using this ionic liquid electrolyte showed good charge-discharge characteristics and cycle performance, comparable with those of carbonate-based electrolyte at low rate. The specific capacity of the LiCoO2 remained 175 mAh·g-1 after 20 cycles (95.1% capacity retention) despite cycling at a high voltage up to 4.50 V. These results indicate that the plastic crystal-based ionic liquid P12TFSI/LiFSI could be potentially applied in high-energy density lithium secondary batteries.

Key wordsLithium ion battery      Plastic crystal      Ionic liquid      Pyrrolidinium      High voltage     
Received: 22 December 2014      Published: 12 May 2015
MSC2000:  O646  
Corresponding Authors: ZHONG Kai-Fu     E-mail:
Cite this article:

ZENG Yu-Qun, GUO Yong-Sheng, WU Bing-Bin, HONG Xiang, WU Kai ZHONG, Kai-Fu. Synthesis and Electrochemical Performance of Plastic Crystal Compound-Based Ionic Liquid. Acta Phys. Chim. Sin., 2015, 31(7): 1351-1358.

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