Lithium ion battery non-aqueous electrolyte for fast charging and lithium ion battery

Abstract

The present invention provides a lithium ion battery non-aqueous electrolyte for fast charge and a lithium ion battery, the lithium ion battery non-aqueous electrolyte comprises a lithium salt, a non-aqueous organic solvent and an additive, the additive comprises: (a) a thiouracil compound represented by a structural formula 1, in which X is selected from O or S; r1 and R2 are selected from first main group elements; r3 and R4 are selected from any one of halogen elements, alkyl or halogenated hydrocarbon; and (b) a nitrile compound. In the non-aqueous electrolyte of the lithium ion battery, through organic combined use of the thiouracil compound and the nitrile compound, the fast charge cycle performance and the high-temperature storage performance of the lithium cobalt oxide battery can be obviously improved.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a non-aqueous electrolyte solution for fast-charging lithium-ion batteries and a lithium-ion battery. Background technique [0002] Lithium-ion batteries have high energy density, high average output voltage, small self-discharge, no memory effect, excellent cycle performance, fast charging and discharging, high charging efficiency, high output power, long service life and no toxic and harmful substances, so Known as a green battery. Lithium-ion batteries are widely used in 3C digital, energy storage, power tools and electric vehicles. Nowadays, fast-charge digital batteries have become an indispensable part of important digital fields such as mobile phones, notebook computers, drones, and cameras. [0003] However, in recent years, as consumers have higher and higher requirements for charging and discharging electronic products, the problems of long charging time and low ra...

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Problems solved by technology

[0003] However, in recent years, as consumers have higher and higher requirements for charging and discharging electronic products, the problems of long charging time and low rapid discharge capacity of lithium-ion batteries have been plaguing the lithium-ion battery market.

However, the nitrile functional group is attached to the surface of the positive electrode material after complexing with Co ions, which increases the interface impedance of the positive electrode, which is tantamount to increasing the solvation energy of the lithium ion of the positive electrode, which obviously cannot match the development of the fast charging system of today's digital batteries.

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