Ionic liquids with bifluoride anions possess properties such as high conductivity, wide electrochemical windows and low viscosity. These properties make them attractive materials for various electrochemical devices. Due to the lack of reliable synthetic routes, however, bifluoride-based ionic liquids have seldom been explored. Herein, an autocatalytic strategy for the HF-free synthesis of bifluoride-based sulfonamide ionic liquids via the sulfur(VI) fluoride exchange (SuFEx) reaction was reported. This reported reaction requires no chromatographic purification and produces quantitative yields. Thermophysical properties of the bifluroide-based ionic liquids (i.e. phase transition behavior and decomposition temperature), and electrochemical stability were studied. The products with alkyl, aryl and perfluoroalkyl side chains exhibited extraordinarily wide electrochemical windows (up to 6.0 V).

Bifluoride ionic liquids with ultra-high electrochemical stability for metal-ion batteries

2019 Spring National Meeting

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