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A adhesive and preparation method and application

A technology for binders and lithium-ion batteries, applied in the direction of binders, nitrile copolymer binders, ester copolymer binders, etc., can solve the problems of increased battery internal resistance, poor low-temperature performance, and easy Expansion and other issues to achieve the effect of improving the interaction

Active Publication Date: 2022-08-09
SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the negative electrode binder system CMC+SBR, too high a proportion of CMC will not only cause the electrode sheet to be too brittle, but also increase the internal resistance of the battery. In addition, the low temperature performance of the negative electrode binder system CMC+SBR battery is generally poor.
[0005] However, lithium-ion battery anode materials are easy to swell during actual use, especially silicon anode materials, although they have the advantages of high capacity and low cost, their easy-to-swell characteristics seriously hinder their industrial application

Method used

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  • A adhesive and preparation method and application
  • A adhesive and preparation method and application

Examples

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Embodiment 1

[0055] This embodiment provides a binding agent and its preparation method, which includes the following components in the quality percentage meter: polypropylene 腈 70WT %, polypropylene 20WT %, and polymethylene methampite 10WWT %.

[0056]The preparation method of this adhesive includes the following steps: mixing polypropylene, polyacryonic acid, polymethyl acrylic, and water, beating 2h, drying to obtain the binder; And the quality of the three components of polycopylene acrylics is the same.

[0057] This embodiment also provides a lithium -ion battery negative material and its preparation method, which includes lithium -ion battery negative materials, including lithotriplastic graphite, adhesives provided by this embodiment, and conductive graphite. The quality of the negative active substances in the negative electrode material of the lithium ion battery is 98WT %, the quality of the binder is 1WT %, and the quality of the conductive agent is 1WT %.

[0058] The preparation...

Embodiment 2

[0061] This embodiment provides a binding agent and its preparation method. The difference from the embodiment 1 is that the adhesive is composed of the following components: polyacryli 腈 60WT %, polyacrylic acid 25WT %, and polymethylene methyl ester 15WT %.

[0062] This embodiment also provides a lithium -ion battery negative material and its preparation method. The difference from the embodiment 1 is only the binder provided by the adhesive to this embodiment.

[0063] Replace the negative active substances in the negative electrode material of the lithium -ion battery to a quality silicon of equal quality to obtain another lithium -ion battery negative material.

Embodiment 3

[0065] This embodiment provides a binding agent and its preparation method. The difference from the embodiment 1 is that the adhesive is composed of the following components: polypropylene 腈 70WT %, polyacryonic acid 15WT %, and polymethylene methyl amethyl 15WT %.

[0066] This embodiment also provides a lithium -ion battery negative material and its preparation method. The difference from the embodiment 1 is only the binder provided by the adhesive to this embodiment.

[0067] Replace the negative active substances in the negative electrode material of the lithium -ion battery to a quality silicon of equal quality to obtain another lithium -ion battery negative material.

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Abstract

The invention provides a binder, a preparation method and application thereof. The binder comprises the following components in terms of mass percentage: polyacrylonitrile 60-70 wt %, polyacrylic acid 15-25 wt % and polyacrylate 5 ~15wt%; the preparation method of the binder includes the following steps: mixing polyacrylonitrile, polyacrylic acid and polyacrylate uniformly to obtain the binder. The binder provided by the invention can be used in the negative electrode material of lithium ion battery, and under the condition of low content, the effect of suppressing the expansion of the negative electrode can be realized, and the capacity retention rate of the negative electrode after a long charge-discharge cycle can be improved.

Description

Technical field [0001] The invention is a lithium -ion battery negative technology field, which involves a binder and its preparation methods and applications. Background technique [0002] Lithium -ion batteries are used as electric vehicles or related energy storage equipment, and the battery requires a long service life and safety performance. However, in the actual use of lithium -ion batteries, due to long -term rechargement and discharge, the SEI membrane of which gradually thickens, and the negative electrode will have a volume expansion, especially for the volume expansion of silicon materials in the process of lithium embedded by more than 300 %. This is not only this not only It will cause the powder's own powder and crushing, and it will also cause damage to the electrodes, cracks, etc., which will have a huge impact on the cycle life of the battery itself, and it will expand the module and affect the safety performance of the module. Therefore, the volume expansion of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/20C09J133/02C09J133/12H01M4/62H01M10/0525
CPCC09J133/20H01M4/622H01M4/628H01M10/0525C08L2203/20C08L33/02C08L33/12Y02E60/10
Inventor 李峥冯玉川沈志鹏陈凯何泓材
Owner SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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