A high-voltage sodium battery electrolyte suitable for polyanionic cathodes

Abstract

The application belongs to the technical field of sodium ion battery electrolyte, and discloses a high-voltage sodium battery ester electrolyte suitable for polyanion positive electrodes, which comprises a sodium salt, a carbonate organic solvent and an organic additive, wherein the organic additive is a benzyl cyanoboronic acid pinacol ester derivative; the derivative can construct a dense and stable positive and negative electrode interface film, and can also inhibit the dissolution of vanadium elements in the positive electrode and the oxidative decomposition of the electrolyte under high voltage; the additive strategy can fully exert the full battery capacity of the high-voltage polyanion positive electrode, significantly improve the cycle stability of the battery, and has important guiding significance for the research and development of electrolytes suitable for the positive electrode.

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