Nonaqueous electrolyte additive and nonaqueous electrolyte containing the additive

Abstract

The invention discloses a non-aqueous electrolyte additive. The additive is a fused ring compound containing two ether oxygen groups and a sulfonic lithium group; wherein the two ether oxygen groups are at para-positions of the same benzene ring, the sulfonic lithium group is at a meta-position of a benzene ring adjacent to the benzene ring, and the fused ring compound is naphthalene or anthracene. The invention also provides non-aqueous electrolyte containing the additive on the basis of the non-aqueous electrolyte additive. The additive can enable an electrode to form a tough envelope on an interface with the electrolyte, so as to reduce the reaction between the electrode and the electrolyte, and not to affect the transfer of lithium ions between the electrolyte and the electrode, so that the service life of a lithium ion battery is prolonged.

Description

technical field [0001] The invention relates to a non-aqueous electrolytic solution additive for a lithium-ion secondary battery and a non-aqueous electrolytic solution for a lithium-ion secondary battery containing the additive, belonging to the technical field of lithium-ion secondary batteries. Background technique [0002] Secondary batteries include nickel-metal hydride secondary batteries, nickel-cadmium secondary batteries, lead-acid secondary batteries, and lithium-ion secondary batteries. Lithium-ion secondary batteries are characterized by their large capacity, fast charging speed, and many cycles advantages are widely used. A large number of studies in recent years have shown that the main reason for shortening the service life of lithium-ion secondary batteries is that the electrodes are prone to react with non-aqueous electrolytes in the high-temperature and high-pressure environment in the battery, which causes the loss of electrode materials and the deteriorat...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the additives in the prior art mainly form a relatively brittle inorganic lithium salt compound film on the surface of the electrode, and the film is easily broken during the cycle process and still cannot prevent the high-temperature and high-pressure reaction between the electrode and the electrolyte; A non-aqueous electrolyte additive capable of forming a tough film on the surface of an electrode

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