Journal
SCIENCE
Volume 362, Issue 6419, Pages 1144-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aat7070
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Funding
- NSF Graduate Research Fellowship Program [NSF-DGE-1650116]
- NSF under DMREF [NSF-CHE-1335486]
- Office of Science of the U.S. Department of Energy (DOE) [DE-AC05-00OR22725]
- DOE Office of Science [DE-AC02-05CH11231S]
- DOE Office of Science, Office of Basic Energy Sciences [DE-AC02-05CH11231]
- Beckman Institute of the California Institute of Technology
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Fluoride ion batteries are potential next-generation electrochemical storage devices that offer high energy density. At present, such batteries are limited to operation at high temperatures because suitable fluoride ion-conducting electrolytes are known only in the solid state. We report a liquid fluoride ion-conducting electrolyte with high ionic conductivity, wide operating voltage, and robust chemical stability based on dry tetraalkylammonium fluoride salts in ether solvents. Pairing this liquid electrolyte with a copper-lanthanum trifluoride (Cu@LaF3) core-shell cathode, we demonstrate reversible fluorination and defluorination reactions in a fluoride ion electrochemical cell cycled at room temperature. Fluoride ion-mediated electrochemistry offers a pathway toward developing capacities beyond that of lithium ion technology.
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