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Conductive paste containing carbon material and secondary battery

A conductive paste, secondary battery technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of powder loss of collectors, poor binding force, and difficulty in drying carbon materials with moisture, so as to improve output. Effects of power characteristics, improved compaction density, excellent dispersibility

Pending Publication Date: 2022-08-05
广东一纳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1. The solvents used in conductive paste are generally organic solvents such as N-methylpyrrolidone (NMP), which will cause serious adverse effects on the environment while causing high costs;
[0009] 2. When the solvent used for the conductive paste is deionized water, when the coating slurry containing the conductive paste and the binder is coated on the electrode collector and then dried and solidified, the collector will appear The problem of falling powder, the bonding force between the carbon material in the conductive paste and the current collector is poor, and there is a problem that the moisture of the carbon material is difficult to dry during drying and solidification, which leads to low battery cycle performance;
[0010] 3. When the used solvent of the conductive paste is deionized water, when the coating slurry comprising the conductive paste, adhesive, and active material is coated on the electrode collector to make the electrode active material layer, The carbon material in the conductive paste is difficult to disperse uniformly in the coating paste, and the adhesion between the electrode active material layer and the current collector is insufficient, so the discharge capacity cannot be improved

Method used

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  • Conductive paste containing carbon material and secondary battery

Examples

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Effect test

preparation example Construction

[0063] As a preparation method of the slurry for positive electrodes, the method of adding the solution or dispersion liquid of a positive electrode active material and a binder to the said carbon material containing electrically conductive paste, and mixing using a mixer etc. is mentioned, for example. The mixer used for mixing is not particularly limited, and examples thereof include a planetary mixer, a disperser, a film cyclone mixer, a jet mixer, and an autorotation mixer. It should be noted that the above-mentioned binder solution is a solution in which a binder is dissolved or dispersed in water.

[0064] [Manufacturing method of electrode for secondary battery]

[0065] The electrode for secondary batteries of this invention can be prepared by the above-mentioned method, for example, and can manufacture by apply|coating the coating slurry for electrode formation on the collector foil board|substrate which is a collector, removing a solvent, and drying.

[0066] The co...

Embodiment 1

[0077] This embodiment provides a conductive paste containing a carbon material, which specifically includes:

[0078] 10%wt conductive carbon black;

[0079] 5%wt graphene;

[0080] 2.5% wt carbon nanotubes;

[0081] 2%wt of stabilizer;

[0082] 1%wt dispersant;

[0083] The rest is deionized water.

[0084] Wherein, the dispersant is polyvinylpyrrolidone, polyethylene glycol, and polyvinyl alcohol in a mass ratio of 1:1:2.

[0085] Wherein, the stabilizer is a powder, which is sodium carboxymethyl cellulose.

Embodiment 2

[0087] This embodiment provides a conductive paste containing a carbon material, which specifically includes:

[0088] 12%wt conductive carbon black;

[0089] 6%wt graphene;

[0090] 4%wt of carbon nanotubes;

[0091] 3%wt of stabilizer;

[0092] 1%wt dispersant;

[0093] The rest is deionized water.

[0094] Among them, the dispersing agent is polyethylene glycol.

[0095] Among them, the stabilizer is acrylonitrile multi-component copolymer LA132, acrylonitrile multi-component copolymer LA133, and polyacrylic acid in a mass ratio of 1:1:1.

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Abstract

The invention relates to conductive paste containing a carbon material, and the conductive paste is composed of the following components in percentage by mass: not more than 30% wt of a carbon material which comprises conductive carbon black, graphene and a carbon nanotube; the auxiliary agent comprises a dispersing agent and a stabilizing agent, the dispersing agent is one or a mixture of polyvinylpyrrolidone, polyethylene glycol and polyvinyl alcohol, and the stabilizing agent is one or a mixture of sodium carboxymethyl cellulose, an acrylonitrile multipolymer LA132, an acrylonitrile multipolymer LA133, polyacrylic acid and a polytetrafluoroethylene aqueous solution; and the balance of deionized water. The present invention also relates to a secondary battery comprising an electrode formed by coating a coating slurry containing the conductive slurry on a current collector foil substrate of a current collector and drying the coating slurry.

Description

technical field [0001] The present invention relates to a conductive paste (or paste composition) for electrodes of secondary batteries such as lithium ion batteries, and a secondary battery. Background technique [0002] The active material in the positive electrode of the secondary battery such as lithium-ion battery is the core material of the lithium-ion battery. Increasing the proportion of active material in the positive electrode formulation can effectively improve the energy density of the lithium-ion battery; the positive electrode formulation contains lithium ions that can provide However, with the increase of the proportion of active materials in the positive electrode formulation, the proportion of binder and conductive agent will decrease accordingly. Although reducing the amount of conductive agent used can significantly improve the battery life volumetric energy density, but reducing the amount of conductive agent used affects the battery's cycle life and over...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M10/0525
CPCH01M4/625H01M10/0525H01M4/5825Y02E60/10
Inventor 王建兴曹礼洪方波谢冬冬肖敏
Owner 广东一纳科技有限公司