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A kind of binder and lithium ion battery thereof

A lithium-ion battery and binder technology, which is applied in the direction of adhesives, battery electrodes, secondary batteries, etc., can solve the problems of reduced adhesion of positive pole pieces, shedding of positive active materials, and battery performance degradation, and achieves excellent processing performance , Improve the compaction density and improve the flexibility

Active Publication Date: 2018-11-02
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the binding force of PVdF-HFP is significantly lower than that of copolymerized PVdF, and the positive electrode active material will fall off due to low binding force during processing.
After the battery is injected with the electrolyte, the swelling of PVdF-HFP is higher than that of homopolymerized PVdF, and the adhesion force of the positive electrode sheet is greatly reduced, resulting in the problem of active material falling off after formation, aging, and battery use, which will cause the battery Significant performance degradation or failure

Method used

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  • A kind of binder and lithium ion battery thereof
  • A kind of binder and lithium ion battery thereof
  • A kind of binder and lithium ion battery thereof

Examples

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preparation example Construction

[0046] The invention also relates to a preparation method of the binder: the binder is prepared by emulsion polymerization of vinylidene fluoride monomer, olefin monomer unit, acrylate monomer and acrylic acid monomer.

[0047] The present invention also relates to a lithium ion battery, comprising a positive electrode sheet, a negative electrode sheet, a separator and an electrolyte, at least one of the positive electrode sheet, the negative electrode sheet, and the separator contains the binding agent of the present invention, so The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the mass percentage of the binder in the positive electrode active material layer is 1.0-5.0%, preferably 1.5-2.5%.

Embodiment 1-8

[0049] This embodiment provides a method for preparing a positive electrode binder PVdF-Ac for a lithium ion battery, and a positive electrode sheet and a lithium ion battery prepared using the binder.

[0050] Wherein PVdF-Ac is prepared by emulsion polymerization, and the monomer molar content is shown in Table 1:

[0051] Table 1: (unit: mol percent)

[0052]

[0053]

[0054] The aggregation method is:

[0055] Add deionized water, dispersant, pH regulator, and chain transfer agent to a stainless steel reactor, vacuum deoxidize, add quantitative acrylate, acrylic acid monomer and 1 / 2 of the vinylidene fluoride required above, add trigger agent, control the temperature and pressure, start the polymerization reaction, and continuously add the remaining 1 / 2 of vinylidene fluoride and ethylene. After the polymerization is completed, the polymer is demulsified, washed, and dried to obtain PVdF-Ac products. The molecular weight is 600,000 to 1.2 million.

[0056] Embodi...

Embodiment 9～22

[0111] The adhesive is prepared according to the method of Example 1, the structural formula of the polymer is shown in formula V, wherein R 1 ~R 11 The substituents of are shown in Table 7, and the values ​​of a, b, c, and d are shown in Table 8:

[0112] Table 7:

[0113] Example

R 1

R 2

R 3

R 4

R 5

R 6

R 7

R 8

R 9

R 10

R 11

Example 9

-H

-H

-H

-H

-H

-H

-H

-CH 3

-CF 3

-H

-H

Example 10

-CH 3

-H

-H

-H

-H

-H

-CH 3

-CH 2 CH 3

-CF 3

-H

-H

Example 11

-CH 3

-CH 3

-H

-H

-H

-H

-CH 3

-CH 3

-H

-H

-CH 3

Example 12

-H

-H

-CH 3

-H

-H

-H

-CH 3

n-butyl

-H

-H

-CH 3

Example 13

-H

-H

-CH 3

-CH 3

-H

-H

-CH 3

Isobutyl

-H

-H

-H

Example 14

-H

-H

-H

-H

-CH 3

-H

-H

...

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Abstract

The present disclosure relates to a lithium-ion battery bonding agent and a lithium-ion battery comprising the same. The bonding agent may be a polymer comprising structural units represented by Formula I, Formula II, Formula III, and Formula IV, and has an average molecular weight of 500,000 to 1.2 million. The bonding agent may be incorporated into at least one of a positive film, a negative film, a separator, and an electrolyte in the battery. The bonding agent can significantly improve the flexibility of the positive film, avoid processability and battery performance issues caused by the electrode film being too brittle, and help improve the compact density and battery energy density.

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to a lithium-ion battery binder containing the binder-based lithium-ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high working voltage, and long cycle life, and are widely used in civilian equipment such as mobile phones, notebook computers, and digital products, as well as high-tech equipment such as drones, aerospace, and satellites. Lithium-ion batteries are mainly composed of positive electrode, negative electrode, separator and electrolyte. The negative electrode usually uses natural graphite or artificial graphite as the active material, sodium carboxymethylcellulose (CMC) as the dispersant, and styrene-butadiene rubber (SBR). for the adhesive. In the positive electrode, the commonly used active material is lithium cobalt oxide (LiCoO 2 ), conductive carbon as the conductive agent, and polyvinylidene ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/62C09J127/16
CPCC09J127/16H01M4/62H01M4/622H01M4/623H01M10/0525C08F214/225Y02E60/10C08F2800/10
Inventor 钟泽孙成栋刘会会王星会魏增斌
Owner NINGDE AMPEREX TECH
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