Tuning hybrid liquid/solid electrolytes by lowering Li salt concentration for lithium batteries

doi:10.1088/1674-1056/27/6/068201

Abstract

Hybrid liquid/solid electrolytes (HLSEs) consisting of conventional organic liquid electrolyte (LE), polyacrylonitrile (PAN), and ceramic lithium ion conductor Li_1.5Al_0.5Ge_1.5(PO₄)₃ (LAGP) are proposed and investigated. The HLSE has a high ionic conductivity of over 2.25×10^-3 S/cm at 25℃, and an extended electrochemical window of up to 4.8 V versus Li/Li⁺. The Li|HLSE|Li symmetric cells and Li|HLSE|LiFePO₄ cells exhibit small interfacial area specific resistances (ASRs) comparable to that of LE while much smaller than that of ceramic LAGP electrolyte, and excellent performance at room temperature. Bis(trifluoromethane sulfonimide) salt in HLSE significantly affects the properties and electrochemical behaviors. Side reactions can be effectively suppressed by lowering the concentration of Li salt. It is a feasible strategy for pursuing the high energy density batteries with higher safety.

Keywords: lithium battery hybrid liquid/solid electrolyte interfacial resistance salt concentration

Received: 21 January 2018
Revised: 03 March 2018
Accepted manuscript online:

PACS:	82.47.Aa	(Lithium-ion batteries)
	65.40.gk	(Electrochemical properties)
	82.45.Fk	(Electrodes)

Fund:

Project supported by the National Key Basic Research Program of China (Grant No.2014CB932400),the National Natural Science Foundation of China (Grant No.51772167),the China Postdoctoral Science Foundation (Grant No.2016M591169),and the Shenzhen Municipal Basic Research Project,China (Grant No.JCYJ20170412171311288).

Corresponding Authors: Fei-Yu Kang
E-mail: fykang@sz.tsinghua.edu.cn

Cite this article:

Wei Yang(杨伟), Qi-Di Wang(王启迪), Yu Lei(雷宇), Zi-Pei Wan(万子裴), Lei Qin(秦磊), Wei Yu(余唯), Ru-Liang Liu(刘如亮), Deng-Yun Zhai(翟登云), Hong Li(李泓), Bao-Hua Li(李宝华), Fei-Yu Kang(康飞宇) Tuning hybrid liquid/solid electrolytes by lowering Li salt concentration for lithium batteries 2018 Chin. Phys. B 27 068201

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Tuning hybrid liquid/solid electrolytes by lowering Li salt concentration for lithium batteries

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