A lithium -ion battery non -hydrolytic solution and lithium ion battery containing the non -hydraulic solution

Abstract

The invention provides a kind of lithium ion battery nonaqueous electrolytic solution and the lithium ion battery containing the nonaqueous electrolytic solution, the lithium ion battery nonaqueous electrolytic solution comprises lithium salt, nonaqueous organic solvent and additive, and described additive comprises: (a ) succinimide alkali metal ion substituents and derivatives thereof, the alkali metal ion substituents of succinimide and derivatives thereof are shown in structural formula 1: wherein, R1 is selected from Li, Na, K Any one of , Rb, and Cs, R2 and R3 are each independently selected from any one of a hydrogen atom, a fluorine atom, an alkyl group with a carbon content greater than or equal to 1, an alkene group, an alkoxy group or an aromatic group; ( b) ionic form derivatives of succinimide, the ionic form derivatives of succinimide are shown as compound A: this electrolyte can improve the cycle, rate and high temperature performance of the battery, especially suitable for high nickel Lithium-ion battery under the system.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a nonaqueous electrolytic solution for a lithium ion battery and a lithium ion battery containing the nonaqueous electrolytic solution. Background technique [0002] Lithium-ion batteries are widely used in 3C digital, electric tools, aerospace, energy storage, power vehicles and other fields due to their advantages such as high specific energy, no memory effect, and long cycle life. The rapid development of electronic information technology and consumer products has a great impact on lithium-ion batteries. High battery voltage and high energy density can put forward higher requirements. In lithium-ion batteries, high-voltage ternary cathode materials (NCM or NCA) are widely used in portable electronic devices such as mobile phones and notebook computers, as well as electric vehicles and large storage devices due to their advantages such as high energy density, environmental ...

AI Technical Summary

Problems solved by technology

However, during the long-term cycle, this unstable state continues to expand, eventually causing particle rupture, which in turn leads to the rupture and re-formation of the CEI film, which not only consumes a large amount of electrolyte, but also reduces the delithiation and lithium intercalation performance of the positive electrode. It is the most direct cause of capacity fading of high-nickel system materials, and also the most direct reason why the voltage of high-nickel system materials cannot break through 4.2V

Based on this, many studies have been devoted to suppressing the formation of the H3 phase. At present, the main research idea is to achieve it by coating the positive electrode or by developing a new type of positive electrode film-forming additive for the electrolyte. Poor high-temperature storage performance of the battery and high-temperature cycle are generally encountered. Poor performance, poor low-temperature discharge performance and poor safety, therefore, it is imminent to develop a lithium-ion battery electrolyte suitable for high-voltage ternary material systems

Images