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Adhesive and lithium ion battery with same

A lithium-ion battery and binder technology, applied in the direction of adhesives, secondary batteries, battery electrodes, etc., can solve the problems of the reduction of the adhesion force of the positive electrode, the shedding of the positive active material, the shedding of the active material, etc., and achieves excellent processing performance. , Improve the compaction density, the effect of high adhesion

Active Publication Date: 2016-04-20
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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  • Adhesive and lithium ion battery with same
  • Adhesive and lithium ion battery with same
  • Adhesive and lithium ion battery with same

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] The aggregation method is:

[0054] 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.

[0055] Embodiments 1 to 8...

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]

[0114]

[0115] Table 8: (unit: mol percent)

[0116]

[0117] The properties of the lithium-ion batteries prepared by using the binders of the structural formulas of Examples 9-22 are similar to those of the foregoing examples.

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Abstract

The invention relates to the field of lithium ion battery materials, and in particular relates to an adhesive and a lithium ion battery with the same. The adhesive is a polymer containing structure units shown as the formulas I, II, III and IV, and the number-average molecular mass of the adhesive is 0.5 million to 1.2 million. The invention also relates to the lithium ion battery, comprising a positive electrode piece, a negative electrode piece, a separator and electrolyte, wherein the positive electrode piece comprises the adhesive. With the adhesive, the flexibility of the positive electrode piece can be improved greatly, so that the problems of processing, battery performance and the like, caused by crisp electrode pieces, can be avoided, the compaction density can be enhanced, and the energy density of the battery can be further improved.

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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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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