Panasonic Corporation

Chiho Yamada

Hideki Shimamoto

Yoshinori Takamuku

Motohiro Sakata

Eri Hirose

Keisuke Imamura

Mitsumasa Hijiriyama

Kouhei Okuyama

Hisatsugu Izuhara

An electric double layer capacitor includes a first collector, a first polarizable electrode layer provided on the first collector, a second collector, a second polarizable electrode layer provided on the second collector and facing the first polarizable electrode layer, a separator having an insulating property and provided between the first polarizable electrode layer and the second polarizable electrode layer, and a driving electrolyte impregnated in the first polarizable electrode layer and the second polarizable electrode layer. The polarizable electrode layers mainly contain activated carbon made from phenol resin, have a surface roughness not larger than 0.6 &#x3bc;m, and have an electrode density ranging from 0.5 g/cmto 0.7 g/cm. This electric double layer capacitor has characteristics deteriorating little even at low temperatures, thus having a reliability for a long time.

Electric double layer capacitor

The present invention provides an electrode material for an electric double layer capacitor which can provide an electric double layer capacitor having a low internal resistance and a large capacitance, a process for producing the same, and an electrode for an electric double layer capacitor and an electric double layer capacitor using the same. The electrode material of the present invention is characterized by comprising a carbonaceous material and an activated carbon, the carbonaceous material obtained by thermal-treating or activating a fullerene-containing soot or an extracted residue obtained by substantially extracting at least a part of fullerene from a fullerene-containing soot using a solvent. The electrode for an electric double layer capacitor and the electric double layer capacitor of the present invention is characterized by using the electrode material.

Electrode material for electric double layer capacitor and process for producing the same, electrode for electric double layer capacitor, and electric double layer capacitor

An electric double layer capacitor includes a positive electrode, a negative electrode which faces the positive electrode and is isolated therefrom, and an electrolyte solution. The positive electrode includes a first current collector of a metal foil and a first polarizable electrode layer on the first current collector, the first polarizable electrode layer containing a phosphorus compound. The negative electrode includes a second current collector of a metal foil and a second polarizable electrode layer on the second current collector. The electrolyte solution, with which the first and second polarizable electrode layers are impregnated, has fluorine-containing anions as an electrolyte solute.

Growing community of inventors

Osaka, Japan

Chiho Yamada