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Electrode sheet and electric double layer capacitor using the same

A technology of electrode sheets and current collectors, applied in the direction of electrolytic capacitors, capacitors, capacitor electrodes, etc., to achieve the effects of maintaining internal resistance, improving bonding strength, and excellent wet characteristics

Inactive Publication Date: 2006-05-24
MITSUBISHI GAS CHEM CO INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, a coating solution formed by dispersing conductive materials such as carbon black, activated carbon, polytetrafluoroethylene, and cellulose as constituents of coating solutions in organic solvents or aqueous solvents was often used. , however, the composition, coating method, etc. are an important factor that greatly affects whether the important performance such as the internal resistance of the electric double layer capacitor is good or not

Method used

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  • Electrode sheet and electric double layer capacitor using the same
  • Electrode sheet and electric double layer capacitor using the same
  • Electrode sheet and electric double layer capacitor using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (Preparation of coating liquid)

[0040] In a reaction vessel with a stirrer, 100 parts by weight of activated carbon (activated carbon A-BAC-PW15 manufactured by Kureha Chemical Industry Co., Ltd.) and 10 parts by weight of carbon black (denka black manufactured by Denki Kagaku Kogyo Co., Ltd.) were charged to synthesize 5 parts by weight of pitch (synthetic pitch manufactured by Mitsubishi Gas Chemical Co., Ltd., synthetic pitch prepared by polymerizing condensed polycyclic hydrocarbons in the presence of hydrogen fluoride and boron trifluoride) as an organic monomer 75 parts by weight of butyl acrylate, and 150 parts by weight of ethylene glycol monomethyl ether as a solvent. After replacing the interior of the container with nitrogen, 5 parts by weight of azobisisobutyronitrile are added in multiple times. The isobutyronitrile is heated at a temperature above the temperature at which free radicals are generated, and the solution is stirred to complete the graft poly...

Embodiment 2

[0053] (Preparation of coating liquid)

[0054] In the same reaction vessel as in Example 1, 100 parts by weight of activated carbon (activated carbon A-BAC-PW15 manufactured by Kureha Chemical Industry Co., Ltd.), 10 parts by weight of carbon black (denka black manufactured by Denki Kagaku Kogyo Co., Ltd.), 75 parts by weight of butyl acrylate as an organic monomer, and 150 parts by weight of ethylene glycol monomethyl ether as a solvent. After replacing the inside of the container with nitrogen, add 5 parts by weight of azobisisobutyronitrile in multiple times, and heat to a temperature above the temperature at which azobisisobutyronitrile generates free radicals, and the solution is stirred to complete the graft polymerization reaction.

[0055] Similar to Example 1, at the initial stage of the above-mentioned graft polymerization, it was considered to have relatively hard muddy lumps, but in the middle of the reaction, it was in the form of a slurry that had fluidity and c...

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Abstract

The present invention provides an electrode sheet and an electric double layer capacitor using the same, in which a polarized electrode is easily and firmly formed on the surface of a current collector such as a metal foil, even if it is generated due to repeated charging and discharging. The adhesive strength between the current collector and the polarized electrode is hardly lowered even if there is no gas or vibration, etc., and the performance such as internal resistance can be maintained for a long period of time in a state of good performance. The solution is to use the following electrode sheet and the electric double layer capacitor using it. The electrode sheet is formed by drying and heat-treating the coating liquid on the surface of the collector. The liquid is formed by dispersing at least activated carbon and / or carbon black, and a graft polymer obtained by graft polymerization of an organic monomer in a solvent.

Description

technical field [0001] The present invention relates to electrical storage media such as electric double layer capacitors, and more specifically, the present invention relates to electrode sheets for forming polarized electrodes by applying a coating liquid to the surface of a current collector such as metal foil, And an electric double layer capacitor using it. Background technique [0002] In recent years, electric double layer capacitors in which polarized electrodes such as activated carbon are impregnated with an electrolytic solution and electric energy is accumulated in an electric double layer at their interface have been put into practical use as electric storage media. As a general structure of an electric double layer capacitor, an electric double layer with a structure in which collectors such as metal foil and polarized electrodes such as activated carbon are stacked alternately with separators and impregnated with an electrolyte solution is formed. In the capa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/04H01G9/058
CPCH01G9/042Y02E60/13
Inventor 神原丰诸桥健治冈田贵美雄樋口泰光小礒保彦矢田浩一
Owner MITSUBISHI GAS CHEM CO INC
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