A kind of high-voltage lithium-ion battery non-aqueous electrolyte

A lithium-ion battery and non-aqueous electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of high production environment and equipment requirements, cumbersome lithium-ion battery manufacturing process, increased costs, etc., to improve rate performance and inhibit decomposition reactions , the effect of reducing the interface impedance

Active Publication Date: 2021-11-05
余姚市海泰贸易有限公司
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  • Claims
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AI Technical Summary

Problems solved by technology

This secondary liquid injection process makes the manufacturing process of lithium-ion batteries cumbersome, has high requirements on the production environment and equipment, and also increases the cost

Method used

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  • A kind of high-voltage lithium-ion battery non-aqueous electrolyte
  • A kind of high-voltage lithium-ion battery non-aqueous electrolyte
  • A kind of high-voltage lithium-ion battery non-aqueous electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] The preparation method of the electrolyte of Examples 1-12 and Comparative Examples 1-5 is the same as that of the lithium-ion battery, but the additives and their proportions are different.

[0025] 1) Preparation of electrolyte

[0026] Mix ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) according to the mass ratio of EC:DEC:EMC=3:2:5, and then add lithium hexafluorophosphate (LiPF6) to the molar concentration is 1.1mol / L, and the additives include conventional additives and high-voltage functional additives. The types and contents of additives in the electrolyte are shown in Table 1, wherein the ratio of additives is the ratio of the total weight of the electrolyte.

[0027] Table 1 embodiment 1-12 and the additive of comparative example 1-5 and content thereof

[0028]

[0029] 2) Preparation of positive electrode sheet

[0030] Mix positive electrode active material nickel cobalt lithium manganate (LiNi0.5Co0.2Mn0.3), conducti...

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Abstract

The invention discloses a non-aqueous electrolytic solution for a high-voltage lithium-ion battery, which includes an electrolyte lithium salt, a non-aqueous organic solvent and additives. The additives include high-voltage functional additives and conventional additives. The high-voltage functional additives are shown in structural formula 1 A sulfite compound, wherein R1-R3 has any meaning defined in the specification, and the high-voltage functional additive accounts for 0.1% to 5% of the total weight of the electrolyte. The high-voltage non-aqueous electrolyte can form a stable interfacial film on the surface of the positive and negative electrodes, inhibit the reactivity of the electrode surface, reduce the oxidative decomposition of the electrolyte, and effectively inhibit flatulence, thereby improving the high-temperature storage performance of the lithium-ion battery. The cycle performance and service life under normal pressure and high voltage, in addition, the internal interface impedance of the battery is also significantly reduced, which can significantly improve the rate performance.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a non-aqueous electrolyte solution for high-voltage lithium-ion batteries. Background technique [0002] Lithium-ion batteries are widely used in the field of 3C consumer electronics products such as mobile phones and notebook computers due to their advantages such as high specific energy, no memory effect and long cycle life. And the application in the field of energy storage will also become more and more common. With the increase of the mileage of electric vehicles and the gradual reduction of state subsidies, the requirements for the energy density of power batteries are getting higher and higher, and increasing the working voltage of lithium-ion batteries is also one of the important ways to increase the energy density of batteries. At present, a variety of high-voltage cathode materials have been developed, but conventional electrolytes are prone ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/42
CPCH01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 王海军熊俊俏齐士博陈小平
Owner 余姚市海泰贸易有限公司
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