Journal
NATURE ENERGY
Volume 3, Issue 9, Pages 739-746Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41560-018-0199-8
Keywords
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Funding
- Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the US Department of Energy (DOE) through the Advanced Battery Materials Research (BMR) program [DE-AC02-05CH11231]
- DOE [DE-AC05-76RLO1830]
- DOE Vehicle Technologies Program within the core funding of the Applied Battery Research (ABR) for Transportation Program
- US Department of Energy, Office of Science [DE-AC02-06CH11357]
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The key to enabling long-term cycling stability of high-voltage lithium (Li) metal batteries is the development of functional electrolytes that are stable against both Li anodes and high-voltage (above 4 V versus Li/Li+) cathodes. Due to their limited oxidative stability (<4 V), ethers have so far been excluded from being used in high-voltage batteries, in spite of their superior reductive stability against Li metal compared to conventional carbonate electrolytes. Here, we design a concentrated dualsalt/ether electrolyte that induces the formation of stable interfacial layers on both a high-voltage LiNi1/3Mn1/3Co1/3O2 cathode and the Li metal anode, thus realizing a capacity retention of >90% over 300 cycles and similar to 80% over 500 cycles with a charge cut-off voltage of 4.3 V. This study offers a promising approach to enable ether-based electrolytes for high-voltage Li metal battery applications.
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