Lithium ion battery electrolyte

The invention provides a lithium ion battery electrolyte, the lithium ion battery electrolyte comprises a non-aqueous solvent, a lithium salt and an additive, and the additive comprises bicyclic fluorine-containing sulfonate and silane phosphate. According to the lithium ion battery electrolyte, the bicyclic fluorine-containing sulfonate and the silane phosphate are combined and used in the lithium ion battery electrolyte, the synergistic effect of the bicyclic fluorine-containing sulfonate and the silane phosphate is exerted, and the effect of improving the high-temperature cycle performance and the rate capability of a high-nickel system and a high-voltage system of the lithium ion battery more excellently compared with the effect of independently using any additive is achieved. 本发明提供一种锂离子电池电解液，所述锂离子电池电解液包括非水溶剂、锂盐和添加剂，所述添加剂包括双环含氟磺酸酯和硅烷磷酸酯。本发明在锂离子电池电解液中组合使用双环含氟磺酸酯和硅烷磷酸酯，发挥二者的协同作用，取得了相比单独使用其中任意一种添加剂更优异的改善锂离子电池高镍体系和高电压体系的高温循环性能和倍率性能的效果。