Other

Kureha Kagaku Kogyo Kabushiki Kaisha

Tomoyuki Aita

Aisaku Nagai

Naohiro Sonobe

Minoru Noguchi

Manabu Iwaida

Eisuke Komazawa

Jiro Masuko

Katsuo Horie

Hidetora Kashio

Minoru Ishikawa

Hiroshi Kitagoh

A carbonaceous electrode material for electric double layer capacitors having a large capacitor per volume, a low resistivity and a large bulk density, is provided as a carbonaceous material having a specific surface area of 800-2000 m,/g as measured by the nitrogen adsorption BET method, and an average layer-plane spacing of at most 0.36 nm as measured by the X-ray diffraction method. The carbonaceous material is preferably produced by carbonizing and activating a carbon precursor of pitch origin in an oxidizing atmosphere.

Carbonaceous material for electric double layer capacitor and process for production thereof

A binder solution for providing an electrode suitable for use in non-aqueous-type electrochemical devices, such as a battery and an electric double layer capacitor, is formed by dissolving a vinylidene fluoride polymer having an inherent viscosity (and thus a polymerization degree) higher than a conventional level in an organic solvent. An electrode-forming composition is formed by dispersing powdery electrode material in the binder solution and is applied onto an electroconductive substrate while avoiding the gelation of the polymer, followed by drying, to form a composite electrode layer, which retains the powdery electrode material at a smaller amount of vinylidene fluoride polymer than a conventional level and is well resistant to a non-aqueous electrolytic solution.

Vinylidene fluoride polymer-based binder solution and electrode-forming

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Iwaki, Japan

Tomoyuki Aita