Lithium-ion battery electrolyte and lithium-ion battery

Abstract

The invention belongs to the technical field of lithium-ion batteries, in particular to a lithium-ion battery electrolyte and a lithium-ion battery. Three additives, namely an additive A, an additiveB and an additive C, are added in the in the electrolyte, wherein the additive A can improve the cycle performance of a high-nickel material battery and inhibit the battery from increasing internal resistance in high-temperature storage and cyclic processes, the charging and discharging efficiency of the battery in charging and discharging processes can be improved, and self-discharging is reduced; the additive B can form a thin and compact SEI membrane on a negative electrode interface, so that a high-nickel material has relatively low interface impedance when matching with a high-volume high-compaction negative electrode material, and lithium-ions are favorably diffused; the additive C can inhibit a high-nickel battery from producing too much gas so that a battery explosion-proof valveis sprung in the long-term storage process at high temperature, and meanwhile has positive influence on the cycle life of the battery; therefore, the electrolyte guarantees that the battery has a relatively good cyclic life, the internal resistance of the battery in the use process is reduced, and when the battery is used at high temperature, potential safety hazards, which appear as the explosion-proof valve is sprung, are avoided.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery electrolyte and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in 3C digital products, electric vehicles, military aerospace and other fields due to their high working voltage, high energy density, long cycle life, and environmental friendliness. With the improvement of people's living standards, higher requirements are placed on the energy density and working environment of lithium-ion batteries. As we all know, the electrification of fuel vehicles is an inevitable trend in future development. The current lithium-ion power batteries are restricted by energy density and cost, which makes the promotion of electric vehicles relatively slow. Therefore, the development of high energy density power batteries is the key to solving the above problems. Among them, high-nickel system, high-voltage...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to: address the deficiencies of the prior art, and provide an electrolyte that can be adapted to the high-nickel material system, to solve the problems of poor cycle performance and poor battery life during storage and charging of high-nickel material system batteries. During the discharge process, the internal resistance changes greatly, and the problem of high temperature storage is easy to produce gas

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