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

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.

Source: ScienceNOW - December 6, 2018 Category: Science Authors: Davis, V. K., Bates, C. M., Omichi, K., Savoie, B. M., Momcilovic, 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., Mil Tags: Chemistry, Materials Science reports Source Type: news