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Anode additive for lithium batteries and preparation method of anode additive

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: 2020-01-17
BEIJING WELION NEW ENERGY TECH CO LTD
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  • 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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  • Anode additive for lithium batteries and preparation method of anode additive
  • Anode additive for lithium batteries and preparation method of anode additive
  • Anode additive for lithium batteries and preparation method of anode additive

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Experimental program
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Effect test

Embodiment 1-8

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

[0036]

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

[0038]

[0039] Mix the obtained flame-retardant polymer electrolyte a-h, positive active material, conductive agent, and binder according to the mass ratio in Table 3 to obtain a positive electrode slurry, and apply, roll, and die-cut according to the standard lithium-ion battery positive plate preparation method , to g...

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Abstract

The invention relates to an anode additive for lithium batteries. The additive refers to a modified flame-retardant polymer electrolyte obtained by copolymerization of a flame-retardant structure monomer and a polymer electrolyte monomer, hotbox and needling tests are conducted on prepared additive-containing batteries, and results indicate that the safety performance of cells is greatly improvedand the cycle life of the batteries is prolonged. The additive has the advantages as follows: the used additive forms a protective film on the surface of an anode material, and can capture free radicals of the anode active material during thermal runaway and form an excellent protective layer to stop further spreading of thermal runaway. Meanwhile, as the good safety protective film is formed on the surface of the anode active material, the sustained reaction with the electrolyte is avoided, and the service life of the lithium batteries is greatly prolonged.

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 working voltage, high specific energy, and long cycle life, and are widely used in portable electronic devices and vehicles such as electric vehicles and electric bicycles. 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 heat accumulation inside the battery, which further causes the battery to burn or even explode, which is harmful to human life. 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 a...

Claims

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Application Information

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Patent Type & Authority Applications(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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