PURPOSE: To contrive to reduce an internal resistance and make a capacity higher to improve a dielectric strength by constituting an apparatus of polarizable electrodes using an activated carbon block formed by carbonization and activation of a resin foam and of specific electrolytic solution coming in contact with the electrodes.
CONSTITUTION: An activated carbon block is formed by carbonization and activation of a phenol formalin resin foam, substantially has an open-cell structure and has 0.1g/cm3 or more bulk density and 500m2/g or more specific surface area. A pair of polarizable electrodes 1, 1 using the block and separator 3 arranged between are housed in a case 5 and impregnated with an electrolytic solution. This electrolytic solution is an organic electrolytic solution formed by dissolution of at least one of borate tetrafluoride and phosphate hexafluoride as electrolyte and phosphine represented by formula [I] in an organic solvent. In the formula, R1, R2 and R3 are any of alkyl group with 1-10C, monocyclic or polycyclic cycloalkyl group with 5-10C and substituted or unsubstituted aryl group with 5-14C and may be identical or different.
SHIMOJO MASAYUKI
YAMANAKA TORU
SHOJI MASANORI
