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

TITLE=Concentrated LiODFB Electrolyte for Lithium Metal Batteries

JOURNAL=Frontiers in Chemistry

VOLUME=7

YEAR=2019

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2019.00494

DOI=10.3389/fchem.2019.00494

ISSN=2296-2646

ABSTRACT=<p>Nowadays, lithium (Li) metal batteries arouse widespread concerns due to its ultrahigh specific capacity (3,860 mAh g<sup>−1</sup>). 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<sup>−2</sup> for over 3,000 h. Besides, compared to conventional LiPF<sub>6</sub>-carbonate electrolyte, Li/LiFePO<sub>4</sub> 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<sup>+</sup> 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.</p>