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

Victoria K. Davis, Christopher M. Bates, Kaoru Omichi, Brett M. Savoie, Nebojša Momčilović, Qingmin Xu, William J. Wolf, Michael A. Webb, Keith J. Billings, Nam Hawn Chou, Selim Alayoglu, Ryan K. McKenney, Isabelle M. Darolles, Nanditha G. Nair, Adrian Hightower, Daniel Rosenberg, Musahid Ahmed, Christopher J. Brooks, Thomas F. Miller, Robert H. GrubbsSimon C. Jones

Research output: Contribution to journalArticle

39 Scopus citations

Abstract

Fluoride ion batteries are potential “next-generation” electrochemical storage devices tha 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.

Original languageEnglish (US)
Pages (from-to)1144-1148
Number of pages5
JournalScience
Volume362
Issue number6419
DOIs
StatePublished - Dec 7 2018

All Science Journal Classification (ASJC) codes

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    Davis, V. K., Bates, C. M., Omichi, K., Savoie, B. M., Momčilović, N., Xu, Q., Wolf, W. J., Webb, M. A., Billings, K. J., Chou, N. H., Alayoglu, S., McKenney, R. K., Darolles, I. M., Nair, N. G., Hightower, A., Rosenberg, D., Ahmed, M., Brooks, C. J., Miller, T. F., ... Jones, S. C. (2018). Room-temperature cycling of metal fluoride electrodes: Liquid electrolytes for high-energy fluoride ion cells. Science, 362(6419), 1144-1148. https://doi.org/10.1126/science.aat7070