Room-temperature cycling of metal fluoride electrodes: Liquid electrolytes for high-energy fluoride ion cells
Room-temperature cycling of metal fluoride electrodes: Liquid electrolytes for high-energy fluoride ion cells
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DOI：
10.1126/science.aat7070
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发表时间：
2018-12-07
期刊：
影响因子：
56.9
通讯作者：
Jones, Simon C.
中科院分区：
文献类型：
--
作者：
Davis, Victoria K.;Bates, Christopher M.;Jones, Simon C.
氟离子电池是潜在的“下一代”电化学存储装置，具有高能量密度。目前，这种电池仅限于在高温下运行，因为合适的氟离子传导电解质仅以固态存在。我们报告了一种基于醚溶剂中的干燥四烷基氟化铵盐的液体氟离子导电电解质，具有高离子电导率、宽工作电压和强大的化学稳定性。将此液体电解质与铜-三氟化镧（Cu@LaF3）核壳阴极配对，我们在室温下循环的氟离子电化学电池中演示了可逆氟化和脱氟反应。氟离子介导的电化学提供了一条发展锂离子技术之外的能力的途径。
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.