Journal
FRONTIERS IN CHEMISTRY
Volume 7, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fchem.2019.00494
Keywords
Li-metal batteries; concentrated electrolyte; LiODFB; high temperature; dendrites free
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Funding
- National Natural Science Foundation of China [51574191, 51304151]
- Shaanxi Provincial Education Department, China [18JK0474]
- Natural Science Basic Research Plan in Shaanxi Province, China [2018JM5135]
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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 4M LiODFB-DME exhibit superior electrochemical performances, especially at high temperature (65 degrees C). These outstanding performances can be certi fi ed 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.
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