Electrochemical Performance of LiMn₂O₄ in PyR₁₄TFSI Containing Electrolyte at 50 ^oC

Authors

Li-zhen WANG, Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China;Henan Provincial Key Laboratory of Surface Interface Science, Zhengzhou 450001, China;Follow
Xin-ke SUN, Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China;
Xu-zhao YANG, Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China;
Lin-sen ZHANG, Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China;
Yong ZHANG, Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China;Henan Provincial Key Laboratory of Surface Interface Science, Zhengzhou 450001, China;
Wen-jing ZHANG, Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China;

Corresponding Author

Li-zhen WANG(wlz@zzuli.edu.cn)

Abstract

In this work, with an aim to improve the performance of spinel lithium manganese and to reduce the safety concern of Li-ion battery system, the effects of N-methyl-N-butylpyrrolidinium bis (trifluoromethylsulfonyl) imide (PyR₁₄TFSI) on performance of electrolyte and spinel lithium manganes are studied by using differential scanning calorimetry (DSC), BTS battery test system, electrochemical work station, X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results indicate that the ionic conductivity of electrolyte is increased with the increase of PyR₁₄TFSI concentration. When the concentration of PyR₁₄TFSI is 2.5% (by mass), the DSC curves of the PyR₁₄TFSI containing electrolyte are changed from three strong endothermic peaks (89.3 ^oC, 201 ^oC, 224 ^oC) to two strong endothermic peaks (116.6 ^oC, 244.3 ^oC). At 50 ^oC, the rate capability is enhanced, the discharge capacity is increased by 16 mAh·g^-1, and the capacity retention is 88.3% (increased by 2.2%) after cycled for 100 times. PyR₁₄TFSI is beneficial to the stability of the electrode structure.

Graphical Abstract

Keywords

ionic liquids, spinel lithium manganese, PyR14TFSI, safety

DOI Link

https://doi.org/10.13208/j.electrochem.130110

Publication Date

2014-02-25

Online Available Date

2014-02-24

Revised Date

2013-03-25

Received Date

2013-01-10

Recommended Citation

Li-zhen WANG, Xin-ke SUN, Xu-zhao YANG, Lin-sen ZHANG, Yong ZHANG, Wen-jing ZHANG. Electrochemical Performance of LiMn₂O₄ in PyR₁₄TFSI Containing Electrolyte at 50 ^oC[J]. Journal of Electrochemistry, 2014 , 20(1): 66-72.
DOI: 10.13208/j.electrochem.130110
Available at: https://jelectrochem.xmu.edu.cn/journal/vol20/iss1/12