Toyota Jidosha Kabushiki Kaisha

Mitsubishi Chemical Corporation

Kazuyuki Toki

Mikio Murachi

Satoshi Hirahara

Yositaka Takeda

Norio Taguchi

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.

A shaped body is molded from fine particles such as powder, whiskers and short fibers, by preparing a slurry consisting of the fine particles and a supercritical fluid containing a small amount of binder dissolved therein, and supplying the slurry into a mold cavity through an inlet port, so that the fine particles suspended in the supercritical fluid are stacked in the cavity to form a layer as the supercritical fluid is exhausted out of the mold cavity through an outlet port.

Method of forming shaped body from fine particles

A shaped body is formed from fine particles such as powder, whiskers or short fibers of ceramics or metal, by preparing a mold having a mold chamber, an inlet port open to the mold chamber at its first portion and adapted to introduce a mixture of the fine particles and a carrier fluid into the mold chamber, and an outlet port open to the mold chamber at its second portion substantially opposite to the first portion and adapted to exhaust substantially only the carrier fluid in a gaseous state out of the mold chamber; preparing the mixture of the fine particles and the carrier fluid; and supplying the mixture under a pressure elevated substantially above atmospheric pressure into the mold chamber through the inlet port while exhausting the carrier fluid out of the mold chamber through the outlet port.

Growing community of inventors

Tajimi, Japan

Kazuyuki Toki