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Title: Room-temperature cycling of metal fluoride electrodes: Liquid electrolytes for high-energy fluoride ion cells

Journal Article · · Science
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ; ORCiD logo [5];  [6]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [5]; ; ; ; ORCiD logo; ORCiD logo; ORCiD logo; ORCiD logo; ORCiD logo; ORCiD logo; ORCiD logo more »; ORCiD logo « less
  1. Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599 (United States)
  2. Materials Department and Department of Chemical Engineering, University of California, Santa Barbara, CA 93106 (United States)
  3. Honda R&D Co., Ltd. Automobile R&D Center, Haga-machi, Haga-gun, Tochigi 321-3393, Japan
  4. Department of Chemical Engineering, Purdue University, West Lafayette, IN 47907 (United States)
  5. Honda Research Institute Inc., 1381 Kinnear Road, Suite 116, Columbus, OH 43212 (United States)
  6. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125 (United States)
  7. Electrochemical Technologies Group, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 (United States)

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.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
DOE Contract Number:
DGE–1650116; NSF-CHE-1335486; AC05-00OR22725; AC02-05CH11231; DE–AC02–05CH11231
OSTI ID:
1501644
Journal Information:
Science, Vol. 362, Issue 6419; ISSN 0036-8075
Country of Publication:
United States
Language:
English

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