Matsushita Electric Industrial Co., Ltd.

Seiji Nonaka

Mikinari Shimada

Akihiko Yoshida

Masakazu Tanahashi

Tamao Kojima

Munehiro Tabata

Kiyoaki Imoto

Ichiro Aoki

The present invention relates to an electrode metal material for batteries, capacitors, etc, used in contact with non-aqueous electrolyte, and particularly to a capacitor formed of the electrode metal material, and provides a valve metal material capable of decreasing the internal resistance of the capacitor. The electrode metal material comprises a valve metal material and numerous carbon particles included in the surface of the valve metal material. The carbon particles are further fixed in the surface of the valve metal material so as to expose to the surface. The electrode metal material is coated with an activated carbon layer and used as a double-layer electrode for an electric double-layer capacitor. The carbon particles included in the surface ensure conduction between the activated carbon layer and the valve metal material. With this configuration, even if the surface of the valve metal material is oxidized, the internal resistance of the electrode is not decreased, the internal resistance of the capacitor is decreased, and the capacitance of the capacitor is increased.

Electrode metal material, capacitor and battery formed of the material and method of producing the material and the capacitor and battery

The present invention relates to an electrode metal material for batteries, capacitors, etc., used in contact with non-aqueous electrolyte, and particularly to a capacitor formed of the electrode metal material, and provides a valve metal material capable of decreasing the internal resistance of the capacitor. The electrode metal material includes a valve metal material and numerous carbon particles included in the surface of the valve metal material. The carbon particles are further fixed in the surface of the valve metal material so as to expose to the surface. The electrode metal material is coated with an activated carbon layer and used as a double-layer electrode for an electric double-layer capacitor. The carbon particles included in the surface ensure conduction between the activated carbon layer and the valve metal material. With this configuration, even if the surface of the valve metal material is oxidized, the internal resistance of the electrode is not decreased, the internal resistance of the capacitor is decreased, and the capacitance of the capacitor is increased.

An electric double layer capacitor having a rectangular cross-section for an excellent volumetric efficiency and a low internal resistance is disclosed. The capacitor comprises a plurality of sheet-like current collectors in one polarity and in the other polarity; the surfaces of the both collectors are formed into polarizable electrodes composed mainly of activated carbon with a binder; a plurality of separators interposed between the current collectors of the one polarity and those of the other polarity.

Electric double layer capacitor

An electric double layer capacitor of reduced internal resistance is manufactured using unit electrodes each consisting of a collector layer and a polarizable electrode layer bonded together through a diffusion layer composed of components of the two layers. To manufacture the capacitor, a pair of unit electrodes are disposed with the respective polarizable electrode layers facing each other and, after impregnation with an electrolyte, the peripheral surfaces of the unit electrodes are sealed with a sealant resin.

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Ibaraki, Japan

Seiji Nonaka