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High-performance aluminum/carbon composite electrode foil and preparation method thereof

A technology of carbon composite and electrode foil, which is applied in the direction of capacitor electrodes, electrode carriers/current collectors, circuits, etc., can solve the problems of poor compatibility, insufficient conductivity and stability, etc., to overcome poor compatibility, The effect of increasing the surface area and improving the binding force

Active Publication Date: 2012-04-25
宇东箔材科技南通有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-performance aluminum / carbon composite electrode foil made by the present invention does not rely on adhesives to bond the carbon layer, but relies on the amorphous carbon layer formed in situ on the surface of the conductive graphite particles to connect the conductive graphite particles and the aluminum foil matrix into one body, The combination of crystalline graphite and amorphous carbon linking phase enables the pole piece to obtain the unity of conductivity, bonding strength and compatibility with organic electrolyte, which overcomes the disadvantages of poor compatibility between single graphite and organic electrolyte and uses amorphous The defects of insufficient conductivity and stability when carbon black is used as a conductive material

Method used

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  • High-performance aluminum/carbon composite electrode foil and preparation method thereof
  • High-performance aluminum/carbon composite electrode foil and preparation method thereof
  • High-performance aluminum/carbon composite electrode foil and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] Example 1 1 part by weight of polyvinylidene fluoride, 98.5 parts by weight of graphite powder with an average particle size of 25 microns, and 0.5 part by weight of a silane coupling agent are uniformly dispersed in a solvent (N-methylpyrrolidone) to obtain a slurry with a solid content of 5%. The slurry is coated on both sides of a corroded aluminum foil with a thickness of 50 μm by dipping, and the thickness of one side of the carbon layer is 50 μm after drying. Put the pole piece at N 2 The atmosphere was maintained at 350°C for 48h.

Embodiment 2

[0033] Example 2 6 parts by weight of polytetrafluoroethylene emulsion (aqueous emulsion with 50% polytetrafluoroethylene content), 96 parts by weight of graphite powder with an average particle diameter of 15 microns, and 1 part by weight of titanate coupling agent in a solvent (dimethyl carbonate ) to obtain a slurry with a solid content of 10%. The slurry was coated on both sides of a corroded aluminum foil with a thickness of 50 μm by dipping. After drying, the thickness of one side of the carbon layer was 35 μm. Put the pole piece at N 2 The atmosphere was maintained at 380°C for 40h.

Embodiment 3

[0034] Example 3 5 parts by weight of epoxy resin, 94.5 parts by weight of graphite with an average particle size of 20 microns, and 0.5 parts by weight of titanate coupling agent were uniformly mixed and dispersed in a solvent (propylene glycol methyl ether) to obtain a slurry with a solid content of 20%. The slurry was coated on both sides of a corroded aluminum foil with a thickness of 50 μm by a knife coating method, and the thickness of one side of the carbon layer was 45 μm after drying. Put the pole piece at N 2 The atmosphere was maintained at 400°C for 36h.

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Abstract

The invention relates to a high-performance aluminum / carbon composite electrode foil and a preparation method thereof. The high-performance aluminum / carbon composite electrode foil comprises a substrate aluminum foil and a carbon-containing layer formed on the surface of the aluminum foil, wherein the carbon-containing layer comprises graphite particles and an amorphous carbon layer, wherein the graphite particles have high electrical conductivity; the amorphous carbon layer is coated on the periphery of the graphite particles and is connected with an aluminum foil substrate to conduct graphite particles; and an interdiffusion layer with a certain depth is formed between the aluminum foil substrate and the carbon-containing layer. The preparation method for the high-performance aluminum / carbon composite electrode foil is characterized by comprising the following steps of: blending graphite powder, organic resin and an active additive in an organic solvent to prepare slurry; coating the slurring on the aluminum foil; and performing heat treatment under the condition of isolating oxygen after drying the slurry. The preparation method is simple in process and low in cost; and the prepared electrode foil has high-temperature stability, extremely low internal resistance, good sealing performance and wide application prospect.

Description

technical field [0001] The invention relates to an aluminum / carbon composite electrode foil and a preparation method thereof. Specifically, the invention relates to a method for manufacturing an aluminum / carbon composite electrode foil that can be used as an electrode material or an electrode collector material for devices such as aluminum electrolytic capacitors, supercapacitors, and lithium-ion batteries, and belongs to the field of energy materials. Background technique [0002] Commonly used energy storage devices such as capacitors and batteries have high capacity and low internal resistance performance requirements in order to ensure their performance, so as to obtain greater energy storage and output efficiency. The main structure of energy storage devices such as capacitors (batteries) is anode / dielectric material (electrolyte) / cathode / collector. Electrode materials have an extremely significant impact on the capacity and internal resistance of energy storage device...

Claims

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Application Information

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IPC IPC(8): H01G9/04H01G9/045H01M4/66
CPCY02E60/12Y02E60/10
Inventor 李荐黄祖琼陈卫东姚建军杨振江
Owner 宇东箔材科技南通有限公司
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