Lithium ion battery electrolyte additive for high-nickel system, electrolyte and battery

Abstract

The invention provides a lithium ion battery electrolyte additive for a high-nickel system, an electrolyte and a battery, and the lithium ion battery electrolyte additive for the high-nickel system isat least one of 1, 1-diphenyl alkyl nitrile compounds.. The electrolyte has excellent film-forming property, can form a stable and compact passivation film on the surface of a positive electrode, canprevent the electrolyte from being decomposed on the surface of the positive electrode, also has the performance of improving the oxidative decomposition potential of the electrolyte, has certain water removal and acid inhibition functions, and can effectively inhibit the side reaction between the positive electrode and the electrolyte and the increase of the internal resistance of a battery.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium ion battery electrolyte additive for high nickel system, electrolyte and battery. Background technique [0002] Lithium-ion batteries are widely used in various digital products, drones, electric vehicles and other fields. It is known as an ideal energy carrier for the development of the 21st century. In recent years, people's demand for the energy density of lithium-ion batteries has been increasing, and its energy density needs to be further improved, which is particularly urgent in the field of power batteries. [0003] Because of the demand for high energy density batteries, the ternary cathode materials commonly used in lithium-ion batteries are slowly developing towards high nickel. However, under high nickel conditions, negative phenomena such as H2-H3 phase transition, oxygen evolution, cation mixing, and transition metal dissolution will occur ...

AI Technical Summary

Problems solved by technology

Although most of these methods can optimize some performance of the battery, they will be at the expense of other performance of the battery; at

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