To provide an electric double layer capacitor which has practical and high capacitance in which internal resistance is reduced, and a polarizable electrode of solid carbon which is excellent in mechanical strength and durability, and applies non-aqueous electrolytic solution having high capacitance, high output and high energy density to electrolyte.
Carbonaceous material exhibiting excellent conductivity of at most 0.5 Ω.cm is used as main component, and solid carbon is formed which has specific surface area of at least 700 m2/g and at most 2000 m2/g measured by a nitrogen adsorption method (BET method) with fines holes formed by activation treatment. A polarizable electrode is constituted of the solid carbon. This electric double layer capacitor uses non-aqueous electrolytic solution as electrolyte, and has an internal resistance of 5-10 Ω obtained from IR drop when capacitance is measured by a constant current discharge method of 30 mA/cm2.
SOTOSHIRO NAOTOMO
HORI YUICHI
