Lithium ion battery non-aqueous electrolyte and application thereof

The invention discloses a lithium ion battery non-aqueous electrolyte. The electrolyte comprises a non-aqueous solvent, electrolyte lithium salt, a first additive and a second additive; the first additive is a sulfonate material, and the second additive is a nitrogen atom-containing cage silicate material. The novel cyclic sulfonate additive provided by the invention is used for preparing the non-aqueous lithium ion electrolyte, is applied to a lithium ion battery, and can form a thin and uniform SEI film with flexibility on the surface of a negative electrode of the battery; meanwhile, the nitrogen atom-containing cage-like silicate ester material has deacidification capability, can inhibit decomposition of LiPF6, complex HF in a system, passivate the surface of a positive electrode, inhibit capacity fading during high-temperature circulation, improve high-temperature circulation performance and storage characteristics, inhibit gas production during high-temperature storage of the lithium ion battery, and pr