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Method for preparing electrodes of capacitor in double electrode layer

A technology of electric double layer capacitors and electrodes, which is applied in the electronic field, can solve the problems of low bonding strength between collector and polarized electrode, and achieve the effects of good charge and discharge cycle, strong adhesion, and high bonding strength

Inactive Publication Date: 2006-12-06
锦州凯美能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems existing in the current electric double layer capacitor electrode and its production technology, the present invention provides a preparation method of the electric double layer capacitor electrode, which solves the problem of low bonding strength between the collector electrode and the polarized electrode, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The purity of aluminum is more than 99.9%, and the copper content is less than 0.01%, and the AC double-sided corrosion is carried out to obtain a corroded aluminum foil with a thickness of 20 μm and a roughness of 2.0 μm on one side. The surface composition is observed under a 20,000-fold electron microscope. Sponge, the average pore size of corrosion holes is 0.1μm, within 1cm 2 There are 8 billion holes in the area, and the tensile strength is 1.7kg / cm, which is used as a collector.

[0023] 1 part by weight of carboxymethyl cellulose, 7 parts by weight of butyl rubber, 1 part by weight of polyperfluoroethylene, and 1 part by weight of polyoxyethylene propylene block copolymer dissolved in deionized water to disperse it, activated carbon powder 80 parts by weight and 10 parts by weight of carbon black form a slurry with a solid content of 16%, which is coated on both sides of the collector, dried at 120° C. for 60 minutes, pressed into a thickness of 100 μm, and cut ...

Embodiment 2

[0029] The carboxymethyl cellulose of 1 weight part, the butyl rubber of 6 weight parts, the polyperfluoroethylene of 1 weight part, the polyoxyethylene propylene block copolymer of 2 weight parts dissolve it in deionized water and disperse it, other same example 1.

[0030] As in Example 1, the charge-discharge cycle test was carried out at an ambient temperature of 45°C and a current of 10A from 2.5V to 1.25V. The capacity retention rate was 85% after 20,000 cycles. In addition, separate the aluminum foil and the polarized electrode with a knife, leaving a large amount of electrode material on the side of the aluminum foil.

Embodiment 3

[0032]1 part by weight of carboxymethyl cellulose, 5 parts by weight of butyl rubber, 2 parts by weight of polyperfluoroethylene, 2 parts by weight of polyoxyethylene propylene block copolymer, 1 part by weight of polyvinylpyrrolidone dissolved in Disperse it in deionized water, and the others are the same as Example 1. As in Example 1, the charge-discharge cycle test was carried out at an ambient temperature of 45°C and a current of 10A from 2.5V to 1.25V. The capacity retention rate was 80% after 20,000 cycles. Separate the aluminum foil and the polarized electrode with an external knife, and a large amount of electrode material remains on the side of the aluminum foil.

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Abstract

The method for preparing electrode of double electric layer capacitor includes steps: solving bonding material in solvent, dispersing powder of charcoal material and conducting material so as to prepare pulp, where volume content of solid matter is 10-25%; coating the pulp on surface of collector; pressing dried pulp to 60-150 micro to integrate and glue polarization pole and collector firmly so as to form band electrode, which is cut into two pieces of band electrode in same size; riveting leading wire to each piece of band electrode; inserting membrane in 30-80 micro to insulate electrodes; winding electrodes and membrane into core, and vacuum drying it for 8-18h. In the invention, polarization pole is composed of charcoal material, conducting material and bonding material. Advantages are: large bond strength, withstanding high voltage, and good charging and discharging periodicity.

Description

technical field [0001] The invention belongs to the field of electronic technology and relates to electric double layer capacitors, in particular to a method for preparing electrodes of electric double layer capacitors. Background technique [0002] The principle of an electric double layer capacitor is to form an electric double layer at the interface between the electrode and the electrolyte to accumulate charges. In order to increase the capacity density, the electrode should use active carbon, carbon fiber, carbon black, carbon nanotubes, metal oxides, conductive polymers and other active materials with high specific surface area. Material. In order to make the electrode charge and discharge efficiently, a low-impedance coating such as metal and graphite is bonded to the collector. The collector is generally made of high-purity aluminum, stainless steel, nickel, etc. that are resistant to electrochemical corrosion. The electrolyte includes an aqueous electrolyte and an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/058H01G13/00H01G11/86
CPCY02E60/13
Inventor 李文生蔡丹武智惠李爽
Owner 锦州凯美能源有限公司
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