Nippon Chemi-con Corporation

Tosoh F-tech, Inc.

Junichi Kawakami

Masashi Ozawa

Masao Sakakura

Kenji Tamamitsu

Kazuma Okura

Shingo Takeuchi

Hisao Eguchi

Kazuya Koseki

Hideyuki Mimura

Kouichi Kuroda

A gel electrolytic capacitor that can further improve withstand voltage is provided. The gel electrolytic capacitor includes: an anode foil; a cathode foil; and a gel electrolyte disposed between the anode foil and the cathode foil. The gel electrolyte consists of a polymer having three-dimensional (3D) network structure and an electrolyte solution held in said polymer. The polymer is formed by polymerizing 2-hydroxyethyl methacrylate or methacrylic acid. The electrolyte solution includes amines or quaternary cyclic amidinium.

Gel electrolytic capacitor

A high voltage proof solid electrolytic capacitor that can prevent deterioration of voltage proof property due to lead-free reflow etc. and a manufacturing method thereof are provided. A capacitor element having an anode and cathode electrode foils wound via a separator is impregnated with a dispersion comprising conductive polymer particles or powder and a solvent to form a solid electrolyte layer consisting of a conductive polymer, and the voids inside the capacitor element having the solid electrolyte layer formed are filled with an ion-conducting substance comprising a mixed solvent comprising ethylene glycol and &#x3b3;-butyrolactone together with a solute selected from at least one type of an ammonium salt, a quaternary ammonium salt, a quaternized amidinium salt, and an amine salt of an organic acid, an inorganic acid, and a composite compound between organic acid and inorganic acids to obtain a solid electrolytic capacitor.

Solid electrolytic capacitor and manufacturing method thereof

Provided is a flame-retardant electrolytic capacitor which is capable of maintaining flame-retardant effect even after a prolonged period of time. This is an electrolytic capacitor comprising an anode foil that is provided with an oxide film on the surface, a cathode foil, a separator, and an electrolytic solution that contains a solute in a solvent, wherein a phosphoric acid ester amide represented by the following general formula (1) is contained in the electrolytic solution: 

Flame-retardant electrolytic capacitor

A hydrophobic film is formed on the electrode foil surface by adding a straight-chain saturated dicarboxylic acid represented by the general formula: HOOC(CH)COOH (wherein n indicates an integer from 9 to 11) to the electrolytic solution for medium/high-voltage electrolytic capacitor. Addition of a large amount of water to the electrolytic solution is allowed since this hydrophobic film suppresses the hydration reaction between the electrode foil and water. Further, it is possible to retain good lifespan property of the electrolytic capacitor in a medium/high-voltage electrolytic solution by having low specific resistance property and by suppressing the hydration decomposition of the electrode foil, wherein the electrolytic solution is azelaic acid, sebacic acid, 1-methyl-azelaic acid, 1,6-decanedicarboxylic acid, or a salt thereof dissolved in a solvent having ethylene glycol as the main component.

Electrolytic solution for electrolytic capacitor

Disclosed are an aluminum electrolytic capacitor having low impedance properties and a long service life, and an electrolytic solution which enables to give such capacitor. The electrolytic solution contains a solvent containing water, a phosphorus oxoacid ion-generating compound which can generate a phosphorus oxoacid ion in an aqueous solution, and a chelating agent which can coordinate with aluminum to form an aqueous aluminum chelate complex. The electrolytic solution further contains a compound selected from the group consisting of azelaic acid and an azelaic acid salt, and a compound selected from the group consisting of formic acid, a formic acid salt, adipic acid, an adipic acid salt, glutaric acid and a glutaric acid salt. The content of azelaic acid and/or the azelaic acid salt is at least 0.03 moles per kg of the solvent. When the electrolytic solution is used in an electrolytic capacitor which utilizes an anode having an aluminum oxide film containing phosphorus in an amount of 30 to 150 mg per unit CV product in terms of phosphoric acid, the service life of the capacitor is remarkably prolonged.

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Tokyo, Japan

Junichi Kawakami