Electrolyte and battery containing electrolyte

Abstract

The application relates to the field of batteries, and in particular to an electrolyte and a battery containing the electrolyte. The electrolyte provided by the application comprises an organic solvent, an electrolyte and an additive, wherein the additive contains a sulfonyl nitrogen-containing heterocyclic compound and a bissulfonimide salt, and the nitrogen-containing heterocyclic ring in the sulfonyl nitrogen-containing heterocyclic compound is selected from the group consisting of at least one of a pyrazole ring, a pyrroline ring, an imidazole ring, a pyrrolidine ring, a piperidine ring and a pyridine ring. The electrolyte provided by the application can improve the properties of positive and negative interface membranes of the battery, effectively reduce the dissolution in the positive electrode and the deposition in the negative electrode of the transition metal elements in the positive electrode material, inhibit the decomposition of the electrolyte in the positive and negativeelectrodes, and ensure high temperature storage performance and high temperature cycling performance of the battery under high voltage.

Description

technical field [0001] The present application relates to the field of batteries, in particular to an electrolyte and a battery comprising the electrolyte. Background technique [0002] Electronic mobile devices such as laptops, mobile phones, handheld game consoles, and tablet computers can achieve more and more functions, and the application technologies of electric vehicles and smart grids are becoming more and more mature. People have higher and higher requirements for the battery life of the lithium-ion battery as its main driving energy. [0003] Lithium-ion batteries have the advantages of high energy density, long cycle life, environmental friendliness, and no memory effect, and are widely used in digital products, electric vehicles, aerospace and other fields. With the development of science and technology and the progress of society, the market has higher and higher requirements for the charging cut-off voltage of lithium-ion batteries. [0004] However, at a hig...

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Problems solved by technology

[0004] However, at a high voltage of 4.3V, the conventional electrolyte is easily oxidized at the positive electrode interface, and the volume expansion effect of the negative electrode leads to the continuous rupture and reorganization of the SEI film. It will promote the deterioration of positive and negative active materials and further affect the performance of lithium-ion batteries

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