Nippon Chemi-con Corporation

Tomohiro Matsuzaki

Atsushi Yamada

Katsumi Abe

Atsushi Yoshizawa

Hidehiko Itoh

Shogo Aizawa

Naoki Anzai

Norihito Fukui

Kazuya Koseki

Masao Sakakura

Toshiyuki Murakami

Takayuki Nakaji

Kouichi Kuroda

Takashi Arai

Yuuya Tamai

Provided are an electrolytic capacitor with high withstand voltage capable of preventing deterioration of withstand voltage characteristics caused by lead-free reflow or the like and improving ESR characteristics, and a manufacturing method thereof. The electrolytic capacitor is obtained by impregnating a capacitor element in which an anode electrode foil and a cathode electrode foil are wound with a separator interposed, with a dispersion containing: particles of a conductive polymer; sorbitol or sorbitol and polyalcohol; and a solvent so as to form a solid electrolyte layer containing 60 to 92 wt % of the sorbitol or the sorbitol and polyalcohol, and by filling an electrolytic solution containing ethylene glycol in a gap portion in the capacitor element on which the solid electrolyte layer is formed.

Electrolytic capacitor and method of manufacturing the same

An anode foil and a cathode foil which has an oxidation film layer on the surface are separated by a separator and wound to form a capacitor element and then anodic forming is performed on this capacitor element. Next, the capacitor element is immersed in a solution of less than 10 wt %, preferably between 2.0 and 9 wt %, more preferably between 5 and 8 wt % of polyimide silicone dissolved in a ketone solvent, and after removing, the solvent is evaporated off at between 40 and 100&#xb0; C. and heat treating is performed at 150 to 200&#xb0; C. Next, this capacitor element was immersed in a mixture of polymeric monomer and oxidizing agent and the conductive monomer was made to polymerize in the capacitor element to form a solid electrolyte layer. Furthermore, this capacitor element was stored in an external case and the open end was sealed with sealing rubber to form the solid electrolytic capacitor.

Solid electrolytic capacitor

A cathode foil and an anode foil, with an oxidized film layer formed on the surface and a separator interposed therebetween, are wound together to form a capacitor element, and prior to subjecting the capacitor element to chemical repair the content of the binder in the separator is adjusted to 10 to 20% with respect to the total weight of the separator. After the chemical repair, the capacitor element is immersed in mixed liquid prepared by mixing a polymerizable monomer and an oxidizing agent together with a predetermined solvent, a polymerization reaction of the electroconductive polymer is induced in the capacitor element, and a solid electrolyte layer is formed. The capacitor element is then inserted in an outer case; sealing rubber is mounted in the open-end portion and sealed with a tightening operation; and the unit is thereafter aged to form a solid electrolytic capacitor.

Solid electrolytic capacitor and manufacturing method thereof

Negative electrode foil and positive electrode foil having an oxide coating layer formed on the surface thereof with a separator, the separator containing a binder constituted of a compound having a vinyl group, interposed therebetween are wound up to thereby form a capacitor element. The content of binder in the separator is adjusted to 10&#x2013;20% based on the total weight of separator before subjecting the capacitor element to restoration and chemical conversion. After the restoration and chemical conversion, the capacitor element is immersed in a liquid mixture prepared by mixing a polymerizable monomer, an oxidizer and a given solvent together so that polymerization reaction of conductive polymer is effected in the capacitor element to thereby form a solid electrolyte layer. The thus obtained capacitor element is inserted in a sheath case, and its opening end is fitted with sealing rubber. Sealing is accomplished by fastening operation, and aging is performed. Thus, a solid electrolytic capacitor is obtained.

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Ome, Japan

Tomohiro Matsuzaki