Solid electrolytic capacitor and manufacturing method thereof

Abstract

A carbon layer is formed on a solid electrolyte layer of the solid electrolytic capacitor, and a conductor layer connected to a cathode terminal is further disposed thereon. The carbon layer contains carbon particles, and a first additive or a second additive. The first additive is formed from at least one of those selected from the group consisting of hydrated silica and silicate. The second additive is formed from at least one of those selected from the group consisting of a condensation product of an aromatic sulfonic acid with formaldehyde, a condensation product of an aromatic sulfonate with formaldehyde, polystyrene sulfonic acid, and polystyrene sulfonate.

Description

Solid electrolytic capacitor and method of making the same technical field The present invention relates to a solid electrolytic capacitor used in various electronic instruments and a manufacturing method thereof. Background technique In recent years, with the development of digital instruments, there has been a strong demand for capacitors with low equivalent series resistance (hereinafter referred to as ESR) and excellent in high frequency characteristics. In response to such demands, capacitors using solid electrolyte layers such as manganese dioxide, polypyrrole, and polythiophene as electrolytes are being developed and commercialized. FIG. 2 is a cross-sectional view of a conventional solid electrolytic capacitor. This solid electrolytic capacitor has a capacitive element 5 , an anode terminal 6 , a cathode terminal 8 , and an exterior resin 9 . Capacitive element 5 is composed of anode body 1 , dielectric oxide film layer 2 , solid electrolyte layer 3 , and cathod...

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Problems solved by technology

Therefore, the resistance of the interface between the solid electrolyte layer 3 and the carbon layer 4A increases.

In addition, external oxygen or moisture intruding from the gap between the carbon layer 4A and the solid electrolyte layer 3 causes an increase in the intrinsic resistance of the solid electrolyte layer 3 itself.

As a result, the ESR of a solid electrolytic capacitor changes with time and tends to increase

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