Toyota Jidosha Kabushiki Kaisha

Mitsubishi Chemical Corporation

Yositaka Takeda

Satoshi Hirahara

Kazuyuki Toki

Activated carbon adapted for electric double layer capacitors is provided, which capacitors can give a large power density per unit volume and which capacitors, even when charge-and-discharge cycle is repeated under a large current or a constant voltage is continuously applied for a long time, undergo less decrease in output density. In particular, the present invention relates to the activated carbon manufactured by carbonization of coconut shell, which has a BET specific surface area of 2000 m/g to 2500 m/g, an average pore diameter of 1.95 nm (19.5 &#x212b;) to 2.20 nm (22 &#x212b;) and a pore volume of pores having a pore diameter calculated according to a Cranston-Inkley method of 5.0 nm (50 &#x212b;) to 30.0 nm (300 &#x212b;), of 0.05 cm/g to 0.15 cm/g.

Activated carbon for use in electric double layer capacitors

Activated carbon adapted for electric double layer capacitors is provided, which capacitors can give a large power density per unit volume and which capacitors, even when charge-and-discharge cycle is repeated under a large current or a constant voltage is continuously applied for a long time, undergo less decrease in output density. That is, the present invention relates to the activated carbon manufactured by carbonization of coconut shell, which has a BET specific surface area of 2000 m/g to 2500 m/g, an average pore diameter of 1.95 nm (19.5 &#x212b;) to 2.20 nm (22 &#x212b;) and a pore volume of pores having a pore diameter calculated according to a Cranston-Inkley method of 5.0 nm (50 &#x212b;) to 30.0 nm (300 &#x212b;), of 0.05 cm/g to 0.15 cm/g.

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Yokohama, Japan

Yositaka Takeda