Ionic liquids as electrolyte additives for high-voltage lithium-ion batteries

被引：0
|
作者：
Zhang W. [1 ]
Huo Y. [1 ]
Li G. [1 ]
Sun T. [1 ]
Zhao Y. [1 ]
Li C. [1 ]
机构：
[1] National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization, School of Chemical Engineering, Hebei University of Technology, Tianjin
来源：
Huagong Xuebao/CIESC Journal | 2019年 / 70卷 / 06期
关键词：
Additive; Electrochemistry; Electrolytes; High voltage; Ionic liquids; Lithium-ion battery; Oxidation;
D O I：
10.11949/j.issn.0438-1157.20181175
中图分类号：
学科分类号：
摘要：
The functionalized ionic liquids 1-butyl-3-methylimidazoliumbis(trifluoromethanesulfonyl)imide (BMIMTFSI) was synthesized as a high-pressure lithium ion battery electrolyte additive for inhibiting the oxidation of organic solvents to enhance carbonic acid. The electrochemical behaviors of LiNi0.5Mn1.5O4/Li batteries and the surface morphology of LiNi0.5Mn1.5O4 electrode were studied by charge-discharge test, electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and scanning electron microscopy (SEM). The results show that when 20% (vol) BMIMTFSI is added to carbonate-based electrolyte, the highest discharge capacity of LiNi0.5Mn1.5O4/Li cells is 126.81 mA•h•g-1 at 0.2C rate, and the discharge capacity is 109.36 mA•h•g-1 at high rate of 5C, which is 91.7% higher than that in 1.0 mol•L-1 LiPF6-EC/DMC electrolyte. And the discharge capacity retention rate of LiNi0.5Mn1.5O4/Li cells reaches about 95% after 50 cycles at 0.2C rate, which is nearly 10% higher than that with blank electrolytes. The results of SEM showed that a uniform and compact solid electrolyte interface (SEI) film was attached to the surface of LiNi0.5Mn1.5O4 electrode after adding BMIMTFSI to carbonate-based electrolyte. © All Right Reserved.
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页码：2334 / 2342
页数：8
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