A kind of negative electrode binder and its application

A technology of a binder and a negative electrode, applied in the negative electrode binder and its application field, can solve the problem of no obvious improvement in electrical properties, and achieve the improvement of high temperature storage performance and high temperature stability performance, adhesion performance and anti-expansion performance improvement. , the effect of improving safety performance

Active Publication Date: 2021-04-13
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no obvious improvement effect on the electrical performance under high temperature conditions.

Method used

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  • A kind of negative electrode binder and its application
  • A kind of negative electrode binder and its application

Examples

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Effect test

preparation example Construction

[0052] The preparation method of the aforesaid negative electrode binder of the present invention comprises: heating the system containing unsaturated monomer, 1-vinyl-3-butylimidazole hexafluorophosphate, initiator and surfactant to carry out polymerization reaction, polymerization reaction After the completion, adjust the pH of the reaction system to 6-8 to obtain the negative electrode binder.

[0053] The specific process parameters of the above preparation method and the selection of reactants can be the same as those mentioned above, and will not be repeated here.

[0054] The second aspect of the present invention is to provide a negative electrode sheet, which includes the negative electrode binder of the aforementioned first aspect.

[0055] The negative electrode sheet includes a negative electrode current collector and a negative electrode material coated on the surface of the current collector.

[0056] Specifically, during operation, disperse the negative electro...

Embodiment 1

[0067] The preparation method of the negative electrode binder of the present embodiment comprises:

[0068] 1. Put the materials participating in the polymerization reaction into a reaction vessel equipped with a stirrer, a thermometer and a condenser to carry out the polymerization reaction;

[0069] Wherein, the material that participates in polymerization reaction is:

[0070] Methacrylic acid (monomer containing acidic functional group) 89.5 parts by mass

[0071] 5.5 parts by mass of methacrylamide (unsaturated amide)

[0072] 1.5 parts by mass of 2,2,2-trifluoroethyl methacrylate (unsaturated fluorinated carboxylic acid alkyl ester)

[0073] 1.5 parts of 1-vinyl-3-butylimidazolium hexafluorophosphate

[0074] Sodium dodecylphenyl ether sulfonate (surfactant) 1.5 parts by mass

[0075] Potassium persulfate (initiator) 0.5 parts by mass

[0076] 150 parts by mass of deionized water;

[0077] 2. After fully stirring, heat to 75°C to initiate polymerization, stop the ...

Embodiment 2

[0079] The preparation method of the negative electrode binder of the present embodiment comprises:

[0080] 1. Put the materials participating in the polymerization reaction into a reaction vessel equipped with a stirrer, a thermometer and a condenser to carry out the polymerization reaction;

[0081] Wherein, the material that participates in polymerization reaction is:

[0082] Methacrylic acid (monomer containing acidic functional group) 89.0 parts by mass

[0083] 5.5 parts by mass of methacrylamide (unsaturated amide)

[0084] 1.5 parts by mass of 2,2,2-trifluoroethyl methacrylate (unsaturated fluorinated carboxylic acid alkyl ester)

[0085] 2.0 parts of 1-vinyl-3-butylimidazolium hexafluorophosphate

[0086] Sodium dodecylphenyl ether sulfonate (surfactant) 1.5 parts by mass

[0087] Potassium persulfate (initiator) 0.5 parts by mass

[0088] 150 parts by mass of deionized water;

[0089] 2. After fully stirring, heat to 75°C to initiate polymerization, stop the ...

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Abstract

The invention provides a negative electrode binder and an application thereof. The negative electrode binder includes a polymer comprising 1-vinyl-3-butylimidazolium hexafluorophosphate as one of the monomers. The negative electrode binder is used in lithium-ion batteries, which can not only effectively improve the safety performance and low-temperature charging and discharging performance of the lithium-ion batteries, but also optimize the high-temperature storage performance and high-temperature stability performance of the lithium-ion batteries.

Description

technical field [0001] The invention relates to a binder, in particular to a negative electrode binder and its application, and belongs to the technical field of batteries. Background technique [0002] The negative electrode is an important part of the lithium-ion battery. The binder in the negative electrode is one of the important factors affecting the overall kinetic performance of the lithium-ion battery. It is important to improve the performance of the battery by selecting a negative electrode binder with better performance. way. [0003] At present, most of the negative electrode binders used in lithium-ion batteries are styrene-butadiene rubber obtained by copolymerization of butadiene and styrene and its modified materials, such as modified or copolymerized by acrylic acid, acrylonitrile, nitrile, and acrylate. SBR, etc. Compared with pure styrene-butadiene rubber, although the adhesion performance and ion conductivity of the pole piece can be improved through mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525C08F220/06
CPCC08F220/06H01M4/623H01M10/0525C08F220/56C08F220/24C08F226/06Y02E60/10
Inventor 陈伟平李素丽郭盼龙储霖李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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