Power battery and lithium ion electrolyte thereof

Abstract

The invention provides a power battery and a lithium ion electrolyte thereof. The lithium ion electrolyte comprises a non-aqueous organic solvent, lithium salt and an additive, wherein the additive comprises a first additive and a second additive, and the first additive comprises silane sulfate; the first additive accounts for 0.05 to 10% of the total weight of the electrolyte, and the second additive is an auxiliary additive and comprises one or more of vinylene carbonate, propane sultone, fluoroethylene carbonate, vinyl ethylene carbonate, ethylene sulfite, adiponitrile, and succinic anhydride in any proportion; the second additive accounts for 0.1-5wt% of the total weight of the electrolyte, and the non-aqueous organic solvent is a carbonic ester solvent, a carboxylic ester solvent, an ether solvent or a ketone solvent; and the lithium salt comprises primary lithium salt and secondary lithium salt.

Description

technical field [0001] The invention relates to a lithium ion electrolyte solution for a power battery and the power battery thereof, in particular to a lithium ion power battery electrolyte capable of improving the high-temperature performance of the lithium-ion power battery and improving the low-temperature discharge performance, and a lithium ion battery using the electrolyte. Power Battery. Background technique [0002] In the existing technology, with the development of society and the progress of industry, the demand for the environment and energy is increasing day by day, but it brings some social pressures such as environmental pollution, carbon dioxide emissions, and the gradual depletion of petroleum energy to the society. These pressures force Countries around the world are working hard to develop new energy that is green, environmentally friendly and sustainable. In 1990, Japan's Sony Corporation took the lead in commercializing lithium-ion batteries, which are...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent application number 201110390402.3 discloses a lithium-ion battery electrolyte and a lithium-ion secondary battery. By adding a certain amount of silane-based phosphate ester, the silane-based phosphate ester additive is used to preferentially form an SEI with low impedance on the surface of the negative electrode. film (solid electrolyte interface film) to improve the low-temperature performance and cycle performance of the battery, but the high-temperature performance has not been reported

[0005] However, the resistance of the SEI film is small, and it often cannot play a protective role under high temperature conditions, which will cause side reactions in the battery and lead to deterioration of high temperature performance.

Images