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Davis, Victoria K; Bates, Christopher M; Omichi, Kaoru; Savoie, Brett M; Momčilović, Nebojša; Xu, Qingmin; Wolf, William J; Webb, Michael A; Billings, Keith J; Chou, Nam Hawn; Alayoglu, Selim; McKenney, Ryan K; Darolles, Isabelle M; Nair, Nanditha G; Hightower, Adrian; Rosenberg, Daniel; Ahmed, Musahid; Brooks, Christopher J; Miller, 3rd, Thomas F; Grubbs, Robert H; Jones, Simon C
Science (American Association for the Advancement of Science), 12/2018, Volume: 362, Issue: 6419Journal Article
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@LaF ) 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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