Electrolyte additive, electrolyte and silicon-carbon anode lithium ion battery

Abstract

The invention belongs to the technical field of lithium batteries, and relates to an electrolyte additive of a silicon-carbon anode lithium ion battery, an electrolyte and the silicon-carbon anode lithium ion battery. The electrolyte additive is characterized in that the electrolyte additive comprises a fluorine-containing silane-based sulfimide compound and fluoroethylene carbonate, and the fluorine-containing silane-based sulfimide compound is a fluorine-containing silane-based sulfimide compound. The structural formula of the fluorine-containing silyl sulfimide compound is shown as a general formula I), and R1, R2 and R3 are independently selected from C1-C6 alkyl; and R4 and R5 are each independently selected from any one of fluorine, an alkyl group, an alkoxy group, and a fluorine-substituted C1C12 linear or branched alkyl group, and R4 and / or R5 is a fluorine atom or a fluorine-substituted C1-C12 linear or branched alkyl group. The electrolyte additive provided by the invention can effectively improve the cycle performance, the rate capability, the storage performance and other electrochemical properties of the lithium ion battery under high-temperature and low-temperature conditions.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and more specifically, relates to an electrolyte additive for a silicon-carbon negative electrode lithium-ion battery, an electrolyte, and a silicon-carbon negative electrode lithium-ion battery. Background technique [0002] Driven by the market and policies, my country's new energy automobile industry is booming. Power batteries, especially lithium-ion batteries, have a bright market prospect. With the urgent pursuit of the cruising range and safety of power vehicles, higher requirements are placed on the energy density and working environment of lithium-ion batteries. [0003] In order to meet the market demand for high energy and high density of lithium-ion batteries, nano-silicon or SiO x The silicon-carbon negative electrode prepared by composite technology with carbon materials is a feasible route, which can greatly improve the energy and density of lithium-ion batteries. ...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a kind of electrolyte additive of silicon-carbon negative electrode lithium-ion battery, electrolyte and silicon-carbon negative electrode lithium-ion battery, in order to solve the technical problem that existing silicon-carbon negative electrode lithium-ion battery cannot take into account high and low temperature performance

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