Preparation method and application of novel 5V lithium battery high-voltage electrolyte

The invention provides a high-voltage battery electrolyte based on a 4-cyano-3-fluorophenylboryl film-forming additive as well as a preparation method and application of the high-voltage battery electrolyte. The electrolyte comprises an organic solvent, a lithium salt and a film-forming additive, the high-pressure film-forming additive comprises functional groups such as cyano, fluorine, boron and the like. The positive electrode and the negative electrode are helpful to generate conductive and firm interface layers on the positive electrode and the negative electrode, and parasitic side reactions between the lithium-removing positive electrode surface and electrolyte are reduced. The invention also provides a preparation method of the electrolyte. The lithium battery containing the electrolyte provided by the invention adopts a high-voltage lithium-rich manganese-based or nickel-rich ternary positive electrode, and shows excellent cycle performance. 本发明提供了一种基于4-氰基-3-氟苯硼基成膜添加剂的高压电池电解液及其制法和应用。该电解液包括有机溶剂、锂盐和成膜添