Issue 4, 2020

A dual-salt coupled fluoroethylene carbonate succinonitrile-based electrolyte enables Li-metal batteries

Abstract

Succinonitrile (SN)-based electrolytes are attractive due to their considerable ionic conductivity and high oxidative stability. However, the spontaneous chemical side-reactions between SN and Li-metal restrict the extensive applications of such electrolytes in next-generation advanced Li-metal batteries. Herein, we report a novel SN-based electrolyte SN–DLi–FEC which combines the dual-salt (lithium bis(trifluoromethane sulfonimide) (LiTFSI) and lithium difluoro(oxalato)borate (LiODFB)) and the fluoroethylene carbonate (FEC) additive. Compared with other SN-based electrolytes such as SN–SLi–FEC (single salt combined with FEC), SN–DLi–FEC can form a more stable and durable organic–inorganic composite SEI film rich in the B–F bond and LiF on the surface of the Li-metal anode. As a result, interfacial compatibility of the SN-based electrolytes and the Li-metal anode can be significantly enhanced. Moreover, SN–DLi–FEC shows high oxidation resistance, high ionic conductivity and good thermal stability. The LiCoO2 (LCO)/Li battery equipped with SN–DLi–FEC exhibits excellent electrochemical performances at room temperature (RT) and high temperature, and high thermal safety. The novel SN-based electrolyte prepared in this work could be a promising candidate providing better reliability and safety for the development of Li-metal batteries.

Graphical abstract: A dual-salt coupled fluoroethylene carbonate succinonitrile-based electrolyte enables Li-metal batteries

Supplementary files

Article information

Article type
Paper
Submitted
15 oct. 2019
Accepted
21 déc. 2019
First published
25 déc. 2019

J. Mater. Chem. A, 2020,8, 2066-2073

A dual-salt coupled fluoroethylene carbonate succinonitrile-based electrolyte enables Li-metal batteries

C. Fu, Y. Ma, S. Lou, C. Cui, L. Xiang, W. Zhao, P. Zuo, J. Wang, Y. Gao and G. Yin, J. Mater. Chem. A, 2020, 8, 2066 DOI: 10.1039/C9TA11341J

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