Matsushita Electric Industrial Co., Ltd.

Nippon Kodoshi Corporation

Munehiro Morokuma

Yukihiro Nitta

Yuichiro Tsubaki

Ichiro Yamashita

Tsuyoshi Yoshino

Kazuyo Saito

Hiroyuki Matsuura

Yoshihiro Watanabe

Hideki Masumi

Koichiro Minato

Taiji Mizobuchi

Teruyuki Jinzenji

Takehiko Nakahara

Masaaki Yanase

Yuki Murata

Yoshiyuki Mori

An object of the present invention is to provide a separator which is excellent in sticking and adhesion capability with the solid electrolyte, physically strong and highly heat-resistive and to provide a solid electrolyte condenser which is excellent in the impedance characteristic and leak current characteristic. In a solid electrolyte condenser comprising an anode foil, a cathode foil, a separator, the separator is made of a nonwoven fabric containing polyester resin or its derivative manufactured by the wet method. The condenser element is formed by rolling the anode foil and the cathode foil together with the separator between them. The solid electrolyte is provided between the anode foil and the cathode foil of the condenser element.

Separator for solid electrolyte condenser and solid electrolyte condenser using the same

The present invention relates to a solid electrolytic capacitor having a large capacitance and a higher resistance to heat and adapted as a surface-mount device and a method of producing the same. The invention may include the followings features: (1) a layer containing an electroconductive polymer and a less conductive polymer is provided on a dielectric oxide film on the positive electrode foil; (2) a separator of a polyester resin based unwoven fabric made by span bonding and/or wet processing a resin material is sandwiched between the positive electrode foil and the negative electrode foil and rolled together to form a capacitor element which also include a solid electrolyte; (3) a separator is sandwiched between the positive electrode foil and the negative electrode foil coated with a dielectric oxide film exhibiting a withstand voltage of 0.8 to 10 V and rolled together to form a capacitor element which also include a solid electrolyte of an electrically conductive polymer; (4) the negative electrode foil is coated with a layer made of at least a metallic material selected from titanium, zirconium, hafnium, and its compound or of a carbon material; (5) the capacitor element has its content of, water adjusted to not higher than 1% by weight and is enclosed in an outer case; (6-A) the solid electrolyte is a conductive polymer prepared by chemically polymerizing a heterocyclic monomer with the use of an oxidizing solution of which the weight ratio of bivalent iron to trivalent iron is not higher than 0.02; (6-B) the solid electrolyte is a conductive polymer prepared by chemically polymerizing a heterocyclic monomer with the use of an oxidizing solution of which the molar ratio of aliphatic and/or aromatic sulfonic acid to trivalent iron ranges from 3.0 to 3.5; and (7) the solid electrolyte is a conductive polymer prepared by chemically polymerizing a heterocyclic monomer in which the remaining of a basic organic solvent is not higher than 0.8%.

Solid electrolytic capacitor and production method thereof, and conductive polymer polymerizing oxidizing agent solution

The present invention provides a highly reliable aluminum electrolytic capacitor which has no flash point and shows little change or degradation in external appearance and properties. The water content of electrolytic solution of the electrolytic capacitor of this invention is 20-90 wt % and one or more following compounds are included as main electrolytes in the electrolytic solution; ammonium formate, ammonium acetate, ammonium lactate, ammonium glycolate, ammonium oxalate, ammonium succinate, ammonium malonate, ammonium adipate, ammonium benzoate, ammonium glutarate, and ammonium azelate. The electrolytic solution also contains not less than 1 wt % of one or more compounds selected from organic carboxylic acids with a particular structure and ammonium salts of these organic acids. The melting point of the electrolytic solution is &minus;10&deg; C. and below, the chlorine content of a sealing material of the capacitor is not more than 300 ppm to the weight of the sealing material. The impedance ratio of 20&deg; C. to &minus;10&deg; C. at 100 kHz of the aluminum electrolytic capacitor is 4 or less. The present invention can provide a highly reliable aluminum electrolytic capacitor of rated voltage of under 100V, which achieves superior impedance and low temperature properties, and has little risk of ignition even when the electrolytic solution is released.

Aluminum electrolytic capacitor

The invention includes an electrolyte solution, a capacitor element impregnating the electrolyte solution, a case containing the capacitor element, a sealing member sealing the opening of the case, and lead wires coming out from the capacitor element and projecting outside by penetrating through the sealing member. The electrolyte solution contains a salt of carboxylic acid of quaternary matter of a compound containing N, N, N'-substitute amidine group and electrolyte. The electrolyte solution has .gamma.-butyrolactone as solvent, and the electrolyte is dissolved in the solvent. The elastic polymer has a crosslinking elastic polymer material. The sealing member has a molded form formed by crosslinking a mixture containing the crosslinking polymer material, magnesium oxide and crosslinking agent. According to this invention, even in severe conditions of such as an atmosphere of high temperature and high humidity, leakage of electrolyte solution can be prevented. As a result, an aluminum electrolytic capacity of long life and high reliability is obtained.

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Kadoma, Japan

Munehiro Morokuma