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Current collector conductive coating and preparation method thereof

A technology of conductive coating and current collector, applied in electrode current collector coating, electrode manufacturing, etc., can solve unfavorable rate performance of electrochemical system, limit the electronic conductivity of conductive coating, and limit the overall electronic conductivity of electrode and other problems, to achieve the effect of improving working performance and endurance, avoiding the falling off of the motor layer, and reducing the contact internal resistance

Inactive Publication Date: 2020-01-21
宁波铵特姆新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the conductive coating coated on the current collector makes the conductive coating firmly adhere to the current collector by adding a polymer binder; in order to ensure the adhesion between the conductive coating and the current collector, the polymer The amount of binder used is relatively large; however, since the polymer binders used are poor conductors of electrons, the use of a large amount of polymer binders will limit the electronic conductivity of the conductive coating, thereby limiting the overall performance of the electrode. Electronic conduction ability is not conducive to the performance of the rate performance of the electrochemical system

Method used

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  • Current collector conductive coating and preparation method thereof
  • Current collector conductive coating and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0035] This embodiment provides a method for preparing a current collector conductive coating, comprising the following steps:

[0036] S1: Add 85g of deionized water, 3.5g of sodium carboxymethylcellulose and 9g of carbon black into the premixing disperser, and premix and disperse for 2 hours to obtain a premix;

[0037] S2: Add 2 g of thiophene and 0.5 g of acetone acrylamide monomer to the premixed solution, and perform premixed dispersion for 1 hour to obtain a conductive coating slurry;

[0038] S3: Disperse the conductive coating slurry in a sand mill for 5 times;

[0039] S4: coating the conductive coating slurry on the surface of the aluminum foil, and drying to obtain a current collector conductive coating on the surface of the aluminum foil.

[0040] In order to test the performance of the prepared current collector conductive coating, in this example, the lithium iron phosphate positive electrode slurry was further coated on the prepared aluminum foil with a conduc...

Embodiment 2

[0045] This embodiment provides a method for preparing a current collector conductive coating, comprising the following steps:

[0046] S1: Add 90g of N-methylpyrrolidone, 2.3g of carboxymethylcellulose lithium and 6g of acetylene black into the premixing disperser, and premix and disperse for 3 hours to obtain a premix;

[0047] S2: Add 1 g of polypyrrole and 0.7 g of polyacrylic acid-diacetone acrylamide resin and adipic hydrazide crosslinked body to the premixed solution, and premix and disperse for 2 hours to obtain a conductive coating slurry;

[0048] S3: Disperse the conductive coating slurry in a sand mill for 8 times;

[0049] S4: coating the conductive coating slurry on the surface of the aluminum foil, and drying to obtain a current collector conductive coating on the surface of the aluminum foil.

[0050] In order to test the performance of the prepared current collector conductive coating, in this example, the lithium iron phosphate positive electrode slurry was ...

Embodiment 3

[0054] This embodiment provides a method for preparing a current collector conductive coating, comprising the following steps:

[0055] S1: Add 90g of N-methylpyrrolidone, 2g of polyacrylic acid and 18g of carbon nanotubes into the premixing disperser, and premix and disperse for 3 hours to obtain a premix;

[0056] S2: Add 8 g of polyaniline and 0.2 g of diacetone acrylamide monomer to the premixed solution, and perform premixed dispersion for 3 hours to obtain a conductive coating slurry;

[0057] S3: Disperse the conductive coating slurry in a sand mill for 10 times;

[0058] S4: coating the conductive coating slurry on the surface of the aluminum foil, and drying to obtain a current collector conductive coating on the surface of the aluminum foil.

[0059] In order to test the performance of the prepared current collector conductive coating, in this example, the lithium iron phosphate positive electrode slurry was further coated on the prepared aluminum foil with a conduc...

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Abstract

The invention provides a current collector conductive coating and a preparation method thereof, and relates to the technical field of chemical power supplies. The current collector conductive coatingcomprises a polymer binder, a conductive polymer, conductive powder and a crosslinking component, wherein the weight percentage of the polymer binder ranges from 0.1% to 40%, the weight percentage ofthe conductive polymer ranges from 0.1% to 40%, the weight percentage of the conductive powder ranges from 20% to 80%, and the weight percentage of the crosslinking component ranges from 0.01% to 10%.According to the current collector conductive coating provided by the invention, by adding the conductive polymer and the crosslinking component, the adhesive force among the current collector, the current collector conductive coating and the electrode active substance can be improved while the conductivity of the current collector conductive coating is improved, and the problems of impedance increase, temperature rise and the like of the electrode plate after long-term circulation are effectively avoided.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a current collector conductive coating and a preparation method thereof. Background technique [0002] The electrode in the electrochemical system is composed of a current collector and an electrode active material coated on the current collector. The main function of the current collector is to provide good electronic conductivity for the electrochemical system. [0003] At present, in order to increase the binding force and conductivity between the current collector and the electrode active material, and to avoid the corrosion of the current collector by some substances in the electrochemical system, the current collector is selected to be coated with a conductive coating to modify the current collector. . [0004] In the prior art, the conductive coating coated on the current collector makes the conductive coating firmly adhere to the current collector by addin...

Claims

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Application Information

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IPC IPC(8): H01M4/04
CPCH01M4/0404Y02E60/10
Inventor 不公告发明人
Owner 宁波铵特姆新能源科技有限公司