The invention discloses a high-pressure
electrolyte for a high-
nickel ternary
cathode material system lithium ion battery. The high-pressure
electrolyte is composed of an
organic solvent, an
electrolyte lithium salt, a
cathode film-forming additive, an
anode film-forming additive and an anti-oxidation additive; the
cathode film-forming additive is 1,5,2,4-dioxadithiane 2,2,4,4-tetraoxide, the
anode film-forming additive is 4-fluoro-1,3-dioxolan-2-one, the anti-oxidation additive is
tris[2-[2-(2-methoxyethoxy)ethoxy]ethyl]orthoborate, and by taking the total
mass of the high-pressure electrolyte as a reference, the addition amount of the athode film-forming additive is 0.5-1%, the addition amount of the
anode film-forming additive is 2-5%, and the addition amount of the anti-oxidation additive is 0.5-1%. The high-pressure electrolyte has relatively good
oxidation resistance, high
temperature resistance and safety characteristics, guarantees the battery to have relatively good cycle life, also has relatively high electrical
conductivity, is capable of guaranteeing the
high rate and power characteristics of the battery, also has relatively high safety, and is capable of substantially improving the safety performance of the
power battery.