Panasonic Intellectual Property Management Co., Ltd.

Mitsuhiro Fujita

Yasuyuki Ito

Eri Hirose

Hiroyuki Yanagisawa

Motohiro Sakata

Nao Matsumura

Koichi Morikawa

Chiho Nobumori

An object of the present invention is to provide a capacitor excellent in reliability, of which charge-discharge characteristics are hardly deteriorated. The capacitor of the present invention includes: a capacitor element including a positive electrode and a negative electrode; and a case that stores the capacitor element together with an electrolytic solution, wherein at least one of the positive electrode and the negative electrode contains activated carbon, and a sum of volumes per unit weight of pores having a pore diameter of from 30 &#x212b; to 100 &#x212b; inclusive among pores of the activated carbon is 0.2 cm/g or more.

Capacitor

A capacitor electrode includes a substrate having electrical conductivity, a conductive layer formed on a surface of the substrate, and an electrode layer formed on the conductive layer. The electrode layer is allowed to adsorb and desorb ions on a surface thereof. The conductive layer contains flake graphite. A density of the conductive layer is greater than 1.1 g/cm. An average particle size Dof the flake graphite, which is measured by using a dynamic light scattering method, is less than or equal to 10 &#x3bc;m.

Capacitor electrode and capacitor using same

A capacitor electrode includes a conductive base member and an electrode part electrically connected to the base member. The electrode part contains carbon particles of a first carbon material capable of adsorbing and desorbing ions. The electrode part further contains voids including first voids with diameters of not less than 0.2 &#x3bc;m and not more than 1.0 &#x3bc;m, and second voids with diameters of not less than 0.05 &#x3bc;m and less than 0.2 &#x3bc;m. The value of (V&#xd7;V)/(V&#xd7;M) is greater than 0.022, where Vis the sum of the volumes of the first voids, Vis the sum of the volumes of the second voids, and M is the volume of the electrode part per unit weight of the electrode part.

Electrode for capacitors and capacitor using same

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Osaka, Japan

Mitsuhiro Fujita