Concentrated LiODFB Electrolyte for Lithium Metal Batteries

Juan Yu; Na Gao; Jiaxin Peng; Nani Ma; Xiaoyan Liu; Chao Shen; Keyu Xie; Zhao Fang

doi:10.3389/fchem.2019.00494

Frontiers in Chemistry (Jul 2019)

Concentrated LiODFB Electrolyte for Lithium Metal Batteries

Juan Yu,
Na Gao,
Jiaxin Peng,
Nani Ma,
Xiaoyan Liu,
Chao Shen,
Keyu Xie,
Zhao Fang

Affiliations

Juan Yu: School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an, China
Na Gao: School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an, China
Jiaxin Peng: School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an, China
Nani Ma: School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an, China
Xiaoyan Liu: State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi'an, China
Chao Shen: State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi'an, China
Keyu Xie: State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi'an, China
Zhao Fang: School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an, China

DOI: https://doi.org/10.3389/fchem.2019.00494
Journal volume & issue: Vol. 7

Abstract

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Nowadays, lithium (Li) metal batteries arouse widespread concerns due to its ultrahigh specific capacity (3,860 mAh g−1). However, the growth of Li dendrites has always limited their industrial development. In this paper, the use of concentrated electrolyte with lithium difluoro(oxalate)borate (LiODFB) salt in 1, 2-dimethoxyethane (DME) enables the good cycling of a Li metal anode at high Coulombic efficiency (up to 98.1%) without dendrite growth. Furthermore, a Li/Li cell can be cycled at 1 mA cm−2 for over 3,000 h. Besides, compared to conventional LiPF6-carbonate electrolyte, Li/LiFePO4 cells with 4 M LiODFB-DME exhibit superior electrochemical performances, especially at high temperature (65°C). These outstanding performances can be certified to the increased availability of Li+ concentration and the merits of LiODFB salt. We believe that the concentrated LiODFB electrolyte is help to enable practical applications for Li metal anode in rechargeable batteries.

Published in Frontiers in Chemistry

ISSN: 2296-2646 (Online)
Publisher: Frontiers Media S.A.
Country of publisher: Switzerland
LCC subjects: Science: Chemistry
Website: http://journal.frontiersin.org/journal/chemistry

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