Panasonic Intellectual Property Management Co., Ltd.

Rohm Co., Ltd.

Hiroyuki Yanagisawa

Yasuyuki Ito

Eri Hirose

Mitsuhiro Fujita

Chojiro Kuriyama

Nao Matsumura

Koichi Morikawa

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

An electrolytic solution for electric double layer capacitors includes an organic solvent and quaternary ammonium salt dissolved in the organic solvent. The organic solvent consists of sulfolane and chain sulfone. The quaternary ammonium salt is at least one of diethyl dimethyl ammonium salt and ethyl trimethyl ammonium salt.

Electrolyte solution for electric double layer capacitors, and electric double layer 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

An electric double layer capacitor includes an anode, a cathode, and an electrolytic solution provided between the anode and the cathode. The anode may be a niobium porous sintered body with an oxide film formed as a dielectric layer on a surface thereof. The cathode allows an electric double layer at an interface with the electrolytic solution. The electric double layer capacitor has a large capacitance and increased voltage.

Growing community of inventors

Shiga, Japan

Hiroyuki Yanagisawa