Nec Corporation

Junko Kurihara

Gaku Harada

Koji Sakata

Shinako Okada

Toshihiko Nishiyama

Katsuhiko Naoi

Shunzou Suematsu

Kouji Sakata

Ari Manago

A capacitor element and a battery cell which a dry-up phenomenon is restricted and an internal resistance is small are provided. The capacitor element provides a porous separator which has ion permeability and the ability of insulation, a pair of carbon electrode layers having many successive through holes separated by the porous separator, a non-conductive gasket holding the surrounding ends of the carbon electrode layers, a pair of conductive separators holding the carbon electrode layers and the non-conductive gasket from the outside, electrolyte solution in the successive through holes of the carbon electrode layers, and minute particles which are more than 0.1 weight % and less than 5.0 weight % of the electrolyte solution. A battery cell provides electrolyte solution and positive/negative electrode active material layers containing minute particles which are more than 0.1 weight % and less than 5.0 weight % of the electrolyte solution in the successive through holes.

Capacitor element and battery cell

A power supply device of the present invention includes an electric double layer capacitor connected to, e.g., an HDD (Hard Disk Drive), CD-ROM (Compact Disk Read Only Memory) drive, floppy disk drive or similar motor-driven equipment, and another electric double layer capacitor connected to, e.g., a pulse generating device included in a radio transmitter. The capacitors each feed power when the load of the associated equipment sharply varies during operation of the equipment. This makes it needless for a main power supply to feed such power. A laminate polymer battery is connected to a low voltage IC (Integrated Circuit) and feeds power thereto. This also makes it needless for the main power to feed power to the low voltage IC, and allows a short feed line to connect the laminate polymer battery and IC. The short feed line reduces the transfer of noise to the IC and therefore malfunction ascribable to noise.

Power supply circuit

A polymer composed of structural units having a fused ring structure derived from a nitrogen-containing cyclic compound and a quinone compound as represented by the following formula is used as an electrode material for use in batteries. This makes it possible to provide batteries having excellent cycle characteristics and a high power density.

Electrode materials for use in batteries, and electrodes and batteries using same

An electrode for a secondary or rechargeable battery using a conducting polymer as an active material is provided, which realizes a large capacity, a good cycling property, and a high power density. This electrode is comprised of an active material layer having an active material made of a mixture of a nitrogen-containing compound polymer and a quinone-system compound. The molar ratio of the nitrogen-containing compound polymer and the quinone-system compound is preferably in the range of 0.25:0.75&tilde;0.75:0.25 and is more preferably in the range of 0.33:0.66&tilde;0.66:0.33. The active material of the electrode is produced by using a mixture of powders of the nitrogen-containing compound polymer and the quinone-system compound.

Composite electrode for secondary battery and production method thereof

The present invention provides a polymer secondary battery comprising a pair of current collectors and electrodes arranged in opposed relationship with an electrolyte solution-containing separator or a solid electrolyte interposed therebetween, the polymer secondary battery having a structure in which a first polymer active material layer adjacent to the current collector of the negative electrode has laminated thereto at least one layer of a polymer material having an oxidation-reduction potential higher than that of the first polymer active material layer. This polymer secondary battery has a high rate of appearance of capacity, is capable of quick charging and discharging, and exhibits excellent cycle characteristics.

Polymer secondary batteries

A thin-type electric double layer capacitor having low internal resistance. This capacitor includes pairs of a current collector and polarizable electrode disposed opposite to each other with a separator being interposed therebetween. The current collector and polarizable electrode, each containing a thermoplastic binder resin and carbon, are made integral by compatibilization of the thermoplastic binder resins. Polarizable electrode faring with the separator is disposed on the plane as that for the current collector. In this capacitor, the glass-transition temperature of the thermoplastic binder resin contained in the current collector is lower than that of the thermoplastic binder resin contained in the polarizable electrode.

Electric double layer capacitor

An aqueous electric double layer capacitor having excellent wettability with aqueous electrolytic solution, low internal resistance, excellent easiness of forming uniform, thin and wide films and mechanical strength. Activated carbon powder, a polymeric binder having a hydrophilic group and a plasticizer are fully mixed to form a film which is then dried to form an electrode. By using a polymer having a hydrophilic group as a binder, wettability between an aqueous electrolytic solution and the electrode is improved and contact resistance between an electrolysis solution and the electrode can be reduced. In addition, by adding a plasticizer, the amount of polymer binder required to form a thin type electrode can be reduced, thus providing an aqueous solution electric double layer capacitor with low internal resistance.

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Tokyo, Japan

Junko Kurihara