Nec Corporation

Yukari Shimizu

Takashi Saito

Junji Tabuchi

Atsushi Ochi

In an electric double layer capacitor, a pair of conductive layers are formed on a pair of electrically insulating substrates, respectively. A pair of polarizable electrodes are sandwiched between the conductive layers and an ionically conducting separator is interposed between the polarizable electrodes. The polarizable electrodes are preferably made of activated carbon/polyacene composite. This invention realizes to form a plurality of elements electrically insulated on the same substrate, because it is possible to form the electric double layer capacitors using the electrically insulated substrate. More, it is possible to arrange a plurality of elements in line on the same substrate by designing conductive layers forming on the electrically insulating substrates, so that the electric double layer capacitors of which breakdown voltage is high and the height is low are obtained.

Electric double layer capacitor and method of manufacturing the same

An activated carbon/polyacene composite is disclosed. The composite contains activated carbon powder or fiber and having a selected molar ratio range of hydrogen atoms [H] to carbon atoms [C] of 0.01.ltoreq.[H]/[C].ltoreq.0.2. It provides two or more times the capacitance per unit volume, and enables reduction of the equivalent series resistance of an electric double-layer capacitor without compression. It therefore is a suitable composite for use as polarizable electrodes for electric double-layer capacitors. The composite can be made by mixing activated carbon powder or fiber and a thermosetting resin powder such as phenolin resin powder, and subjecting the mixture to heat treatment in a nonoxidizing atmosphere at temperatures between 600.degree. and 1000.degree. C. which is insufficient to reach full carbonization of the thermosetting resin.

Growing community of inventors

Tokyo, Japan

Yukari Shimizu