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A kind of lithium battery positive electrode additive and preparation method thereof

A lithium battery and additive technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as affecting cycle life and reducing energy density, and achieve the effects of good stability, reduced contact, and reduced side reactions

Active Publication Date: 2022-07-12
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above patents, there is a contradiction between the amount of additives used and the safety performance. If the amount is too large, the energy density will be greatly reduced and the cycle life will be seriously affected. If the amount is too small, the effect cannot be achieved.

Method used

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  • A kind of lithium battery positive electrode additive and preparation method thereof
  • A kind of lithium battery positive electrode additive and preparation method thereof
  • A kind of lithium battery positive electrode additive and preparation method thereof

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Experimental program
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Effect test

Embodiment 1-8

[0035] According to the quality shown in Table 1, the reactive flame retardant monomer, polymer electrolyte monomer, a certain amount of surfactant, molecular weight regulator, chelating agent, pH regulator, deionized water are mixed for a certain period of time until a stable emulsion is formed , heating and reacting for a certain period of time, centrifuging the emulsion and vacuum drying to obtain the modified flame retardant polymer electrolyte a-h. Among them, structural formulas (IV)-(VIII) are shown in Table 2, and monomer ①-monomer ⑤ are all reactive flame retardant monomers or electrolyte monomers.

[0036]

[0037] Table 2 Structural formulas (IV)-(VIII)

[0038]

[0039] The obtained flame retardant polymer electrolyte a-h, positive electrode active material, conductive agent, and binder are mixed according to the mass ratio in Table 3 to obtain a positive electrode slurry, which is coated, rolled, and die-cut according to the standard lithium-ion battery posi...

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Abstract

The invention relates to a positive electrode additive for lithium batteries. The additive refers to a modified flame retardant polymer electrolyte obtained by copolymerizing a flame retardant structural monomer and a polymer electrolyte monomer. , Acupuncture test, the results show that the safety performance of the battery is greatly improved, and the cycle life of the battery is improved. The advantage of the present invention is that the additive used in the present invention forms a protective film on the surface of the positive electrode material, which can capture the free radicals of the positive electrode active material during thermal runaway, and form an excellent protective layer to prevent further propagation of thermal runaway. At the same time, a good safety protection film is formed on the surface of the positive electrode active material to avoid continuous reaction with the electrolyte, which greatly improves the service life of the lithium battery.

Description

technical field [0001] The invention relates to the field of lithium battery materials, in particular to a positive electrode additive for lithium batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high operating voltage, high specific energy, and long cycle life, and are widely used in portable electronic devices and in electric vehicles, electric bicycles and other vehicles. Although the safety of lithium-ion batteries has been significantly improved after years of continuous improvement, in extreme environments or abuse conditions, the heat generation rate of the battery is much higher than the heat dissipation rate, resulting in the accumulation of heat inside the battery, which further causes the battery to burn or even explode. Serious threat to property and life. Especially in recent years, in order to meet the needs of electric vehicles and energy storage systems, the research and development of hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/24C08F230/02C08F220/20C08F220/48C08F220/14C08F220/42C08F214/22C08F214/28C08F220/44H01M4/62H01M10/0525
CPCC08F220/24C08F230/02C08F220/14C08F214/225C08F220/44C08F220/42H01M4/628H01M10/0525C08F220/20C08F220/48C08F230/08C08F214/285Y02E60/10
Inventor 高鹏黄杰张万里
Owner BEIJING WELION NEW ENERGY TECH CO LTD
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