Solid electrolytic capacitor and method of manufacturing the same

Abstract

The invention discloses a solid electrolyte capacitor (10). In the capacitor element (12) of said solid electrolyte capacitor (10), using the sintered body with the smaller powder on the anode (24); via electrolyte and oxidation, forming one electric medium oxidized film (26) on its surface; then forming the pre-coat layer (28); via layering the electrolyte aggression of direct current deflected current on the alternative current, forming auxiliary pre-coat layer (20); using auxiliary pre-coat layer (30) to cover the part of pre-coat layer (28) that can not generate micro cavity; then using electrolyte aggression, forming conductive macromolecule layer (32); therefore, it can increase the electrode area without increasing the size of capacitor element (12), and improve the capacity generate rate of solid electrolyte capacitor (10), to realize the insulation between the electrodes, reduce the leak current and the equivalent serial resistance.

Description

technical field [0001] The present invention relates to a solid electrolytic capacitor and a manufacturing method thereof, particularly a solid electrolytic capacitor having, for example, microscopic cavities inside an anode body, and a manufacturing method thereof. Background technique [0002] Conventionally, it is known that in solid electrolytic capacitors, a dielectric oxide film is formed on the surface of an anode body composed of a valve metal sintered body by electrolytic oxidation treatment, and a cathode layer composed of a solid electrolyte is formed on the dielectric oxide film. The valve action metal refers to a metal formed with an extremely fine and durable dielectric oxide film by electrolytic oxidation treatment, and corresponds to tantalum, niobium, aluminum, titanium, and the like. [0003] In the solid electrolyte, conductive inorganic materials such as manganese dioxide, or conductive organic materials such as TCNQ (7,7,8,8-tetracyanoquinodimethane) com...

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Problems solved by technology

[0013] Moreover, since the capacity of the capacitor is determined by the relative area of ​​the cathode layer formed by sandwiching the anode body and the dielectric oxide film, even if the surface area of ​​the anode body is enlarged, the If the surface area of ​​the relative conductive polymer layer is not increased too much, the capacity of the solid electrolytic capacitor cannot be greatly increased

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