Abstract: The present invention provides an electrode for an electric double layer capacitor comprising high energy density, low degradation of electrostatic capacitance and resistance with passage of time even using under high voltage, i.e., excellent long-term reliability. The electrode for the electric double layer capacitor comprises polarizing electrode materials containing porous carbon particles, an auxiliary conducting agent, tungsten oxide powders, and binders; conductive adhesive containing a conductive material and a poly-N-vinylacetamide (PNVA)-based binder; and a sheet current collector.

Abstract: Disclosed is a polarizable electrode material for an electric double layer capacitor with a high energy density and excellent long-term reliability, as well as an electric double layer capacitor in which the polarizable electrode material is used. The polarizable electrode material includes porous carbon particles, a conductive assistant, a tungsten oxide powder and a binder, wherein the tungsten oxide is dispersed in the polarizable electrode material so that the tungsten oxide per 1 g of the polarizable electrode material has a surface area of 0.2 m2 or more and less than 6 m2.

Abstract: [Problem to be Solved] The present invention is aimed at providing a polarizable electrode material for a high-withstand-voltage-type electric double layer capacitor with a high energy density and less degradation over time in capacitance and resistance, that is, excellent long-term reliability; and at providing an electric double layer capacitor in which the polarizable electrode material is used. [Solution] Disclosed are the polarizable electrode material used in an electric double layer capacitor and comprising porous carbon particles, a conductive assistant, a tungsten oxide powder and a binder, wherein the tungsten oxide is dispersed in the polarizable electrode material so that the tungsten oxide per 1 g of the polarizable electrode material has a surface area of 0.2 m2 or more and less than 6 m2; and the electric double layer capacitor in which the polarizable electrode material is used.

Abstract: The present invention provides an electrode for an electric double layer capacitor comprising high energy density, low degradation of electrostatic capacitance and resistance with passage of time even using under high voltage, i.e., excellent long-term reliability. The electrode for the electric double layer capacitor comprises polarizing electrode materials containing porous carbon particles, an auxiliary conducting agent, tungsten oxide powders, and binders; conductive adhesive containing a conductive material and a poly-N-vinylacetamide (PNVA)-based binder; and a sheet current collector.

Abstract: Disclosed is an electric double layer capacitor comprising a polarizable electrode layer that contains an activated carbon, a conductive agent, and a binder, wherein an external specific surface area of the activated carbon (defined as a specific surface area calculated from a nitrogen absorption isotherm by a t-plot method by excluding micropores of pore diameter smaller than 20 angstroms), per unit volume of the polarizable electrode layer, lies within a range of 450 to 800 m2/cm3, and a volume based on inter-particle interstices per unit volume of the polarizable electrode layer lies within a range of 0.05 to 0.12 cm3/cm3. The electric double layer capacitor according to the present invention is particularly suited to large current, quick discharge applications.

Abstract: The object of the invention is to provide a polarizing electrode material for a high withstand voltage-type electric double layer capacitor with high energy density and also with little time-dependent deterioration in capacitance or resistance, namely having excellent long-term reliability, as well as an electric double layer capacitor using the same. The invention provides a polarizing electrode material used in an electric double layer capacitor, characterized by comprising a porous carbon particle, an electroconductive aid, a tungsten oxide powder, and a binder.

Abstract: The invention is directed to the provision of an electric double layer capacitor electrode that can fully utilize the electrode performance of a graphite-like carbon material by preventing degradation of the cycle characteristics. More specifically, the invention provides an electric double layer capacitor electrode constructed by laminating a polarizable electrode layer containing a carbon material having graphite-like microcrystalline carbon to at least one side of a sheet-like current collector, wherein the carbon material has a BET specific surface area of 800 m2/g or less as measured by a nitrogen adsorption method, and the sheet-like current collector has interstices on the side that contacts the polarizable electrode layer.

Abstract: Disclosed is an electric double layer capacitor comprising a polarizable electrode layer that contains an activated carbon, a conductive agent, and a binder, wherein an external specific surface area of the activated carbon (defined as a specific surface area calculated from a nitrogen absorption isotherm by a t-plot method by excluding micropores of pore diameter smaller than 20 angstroms), per unit volume of the polarizable electrode layer, lies within a range of 450 to 800 m2/cm3, and a volume based on inter-particle interstices per unit volume of the polarizable electrode layer lies within a range of 0.05 to 0.12 cm3/cm3. The electric double layer capacitor according to the present invention is particularly suited to large current, quick discharge applications.