含PyR14TFSI电解液LiMn2O4正极高温电化学性能

doi:10.13208/j.electrochem.130110

电化学（中英文） ›› 2014, Vol. 20 ›› Issue (1): 66-72. doi: 10.13208/j.electrochem.130110

含PyR₁₄TFSI电解液LiMn₂O₄正极高温电化学性能

王力臻^1,2*，孙新科¹，杨许召¹，张林森¹，张勇^1,2，张文静¹

1. 郑州轻工业学院材料与化学工程学院，河南郑州 450001；2. 河南省表界面科学重点实验室，河南郑州 450001

收稿日期:2013-01-10 修回日期:2013-03-25 出版日期:2014-02-25 发布日期:2014-02-24
通讯作者: 王力臻 E-mail:wlz@zzuli.edu.cn
基金资助:
国家自然科学基金(No. 21001097)及河南省基础与前沿研究项目(No. 112300413216)资助

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

WANG Li-zhen^1,2*, SUN Xin-ke¹, YANG Xu-zhao¹, ZHANG Lin-sen¹, ZHANG Yong^1,2, ZHANG Wen-jing¹

1. Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China; 2. Henan Provincial Key Laboratory of Surface Interface Science, Zhengzhou 450001, China

Received:2013-01-10 Revised:2013-03-25 Published:2014-02-25 Online:2014-02-24
Contact: WANG Li-zhen E-mail:wlz@zzuli.edu.cn

摘要/Abstract

摘要： 利用差示扫描量热仪（DSC）、电化学工作站、BTS电池测试系统、X-射线衍射仪（XRD）、扫描电子显微镜（SEM）和X射线能量色散谱（EDS）等方法，研究了含离子液体N-甲基丁基吡咯烷二(三氟甲基磺酰)亚胺盐（PyR₁₄TFSI）电解液性能以及LiMn₂O₄电极高温电化学性能. 结果表明，随着1 mol·L^-1 LiPF₆ EC/EMC/DMC（1:1:1，by volume）中PyR₁₄TFSI添加量的增大，电解液的电导率逐渐增大，添加量为2.5%（by mass）时，电解液DSC曲线由89.3 ^oC、201 ^oC、224 ^oC三个强吸热峰变为116.6 ^oC和244.3 ^oC两个强吸热峰；50 ^oC下，LiMn₂O₄倍率性能显著提高，2C放电比容量提高16 mAh·g^-1，100循环周期后容量保持率为88.3%（提高2.2%）. PyR₁₄TFSI添加有利于电极结构的稳定.

关键词: 离子液体, 尖晶石型锰酸锂, N-甲基丁基吡咯烷二(三氟甲基磺酰)亚胺盐, 安全性

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.

Key words: ionic liquids, spinel lithium manganese, PyR14TFSI, safety

中图分类号:

TM911

王力臻*，孙新科，杨许召，张林森，张勇，张文静. 含PyR₁₄TFSI电解液LiMn₂O₄正极高温电化学性能[J]. 电化学（中英文）, 2014, 20(1): 66-72.

WANG Li-zhen*, SUN Xin-ke, YANG Xu-zhao, ZHANG Lin-sen, ZHANG Yong, ZHANG Wen-jing. Electrochemical Performance of LiMn₂O₄ in PyR₁₄TFSI Containing Electrolyte at 50 ^oC[J]. Journal of Electrochemistry, 2014, 20(1): 66-72.

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https://electrochem.xmu.edu.cn/CN/Y2014/V20/I1/66

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含PyR₁₄TFSI电解液LiMn₂O₄正极高温电化学性能

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

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