Journal
ADVANCED MATERIALS
Volume 30, Issue 21, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201706102
Keywords
anode; batteries; high voltage; lithium; localized high-concentration electrolyte
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Funding
- Battery500 Consortium [DE-AC02-05CH11231]
- Office of Biological and Environmental Research
- DOE [DE-AC05-76RL01830]
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Rechargeable lithium-metal batteries (LMBs) are regarded as the holy grail of energy-storage systems, but the electrolytes that are highly stable with both a lithium-metal anode and high-voltage cathodes still remain a great challenge. Here a novel localized high-concentration electrolyte (HCE; 1.2 m lithium bis(fluorosulfonyl)imide in a mixture of dimethyl carbonate/bis(2,2,2-trifluoroethyl) ether (1:2 by mol)) is reported that enables dendrite-free cycling of lithium-metal anodes with high Coulombic efficiency (99.5%) and excellent capacity retention (>80% after 700 cycles) of Li parallel to LiNi1/3Mn1/3Co1/3O2 batteries. Unlike the HCEs reported before, the electrolyte reported in this work exhibits low concentration, low cost, low viscosity, improved conductivity, and good wettability that make LMBs closer to practical applications. The fundamental concept of localized HCEs developed in this work can also be applied to other battery systems, sensors, supercapacitors, and other electrochemical systems.
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