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Positive electrode for electric double layer capacitors and method for the production thereof

A technology for electric double layer capacitors and anode electrodes, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, electrolytic capacitors, etc., can solve the problems of low capacitance retention and degradation of electrochemical components, and the method is simple and safe , the effect of improving the characteristics

Inactive Publication Date: 2006-11-01
POWER SYST KK +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The document explains that synthetic or natural graphite without boron includes only a small number of lattice defects in its crystallites and will degrade significantly during charge and discharge when used as an anode, resulting in low capacitance retention of the electrochemical element

Method used

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  • Positive electrode for electric double layer capacitors and method for the production thereof
  • Positive electrode for electric double layer capacitors and method for the production thereof
  • Positive electrode for electric double layer capacitors and method for the production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] (1) Preparation of the anode electrode

[0101] 3 g of graphite 1-carbon composite particles, 1 g of acetylene black (manufactured by DENKI KAGAKU KOGYOKABUSHIKI KAISHA) and 0.3 g of polytetrafluoroethylene powder (manufactured by Mitsui duPont Fluorochemical Co., Ltd.) were mixed and kneaded in an agate mortar . Using a molding machine, the kneaded product was molded into a sheet having a uniform thickness of 0.4 mm to obtain an anode electrode.

[0102] (2) Preparation of electric double layer capacitor

[0103] Appropriate amounts of activated carbon ("MSP20" manufactured by THE KANSAI COKE AND CHEMICALS Co., Ltd.), acetylene black (manufactured by DENKI KAGAKU KOGYO KABUSHIKIKAISHA) and polyvinylidene fluoride (PVDF) powder (manufactured by KUREHA CORPORATION) Mix and knead in an agate mortar. Using a molding machine, the kneaded product was molded into a sheet having a uniform thickness of 0.4 mm to obtain a negative electrode.

[0104]From each of the obtained...

Embodiment 2 to 9

[0108] Electric double layer capacitors were prepared and examined in the same manner as in Example 1 except that the carbonaceous material of the anode electrode and the electrolytic solution were changed to those shown in Table 2. The test results are shown in Table 3.

[0109] Reference examples 1 to 9

[0110] Electric double layer capacitors were prepared and examined in the same manner as in Example 1 except that the graphite particles shown in Table 2 were used instead of the graphite-carbon composite particles and the electrolytic solution was changed to those shown in Table 2. The test results are shown in Table 3.

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Abstract

The objects of the present invention are to improve characteristics of electric double layer capacitors, such as energy density and charge-and-discharge rate, and to provide a positive electrode for electric double layer capacitors useful for the foregoing object, and a simple method for its production. Disclosed is a positive electrode for electric double layer capacitors comprising graphite-carbon composite particles, the graphite-carbon composite particle being composed of a graphite particle and a carbon layer covering the graphite particle.

Description

technical field [0001] The present invention relates to an electric double layer capacitor in which a carbonaceous electrode is immersed in an electrolytic solution, and in particular, to an anode electrode for an electric double layer capacitor and a method for producing them. Background technique [0002] Capacitors can be repeatedly charged and discharged at large currents, and therefore, are promising as electrical energy storage devices with high charge-discharge frequency. [0003] It is known that an electric double layer capacitor is formed by immersing a carbonaceous electrode in an organic electrolytic solution. Michio Okamura "Electric Double Layer Capacitors and Power Storage Systems" 2nd Edition, The Nikkan Kogyo Shimbun, Ltd., 2001, pp. 34 to 37 discloses an electric double layer capacitor comprising a bath divided into two by a separator , an organic electrolytic solution filled in a bath, and two carbonaceous electrodes, one electrode immersed in one part of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/00H01G9/042H01G11/38H01G11/86
Inventor 中村仁林圭一太田秀利中川泰治芳尾真幸梅野达夫
Owner POWER SYST KK