Solid electrolytic capacitor and method for manufacturing the sa

Details Solid electrolytic capacitor and method for manufacturing the sa Solid electrolytic capacitor and method for manufacturing the sa

1992-04-06

1993-02-16

Griffin, Donald A.

Electricity: electrical systems and devices

Electrolytic systems or devices

Solid electrolytic capacitor

29 2503, H01G 900, B01J 1700

Patent

active

051876493

ABSTRACT:
A solid electrolytic capacitor comprises a valve metal member having a dielectric oxide film and a conductive underlying layer formed on the member in this order, and a conductive polymer film formed on the layer. The conductive polymer film is formed by electrolytic polymerization of a polymerizable monomer contained in an aqueous solution containing a support electrolyte and a phosphate. By the presence of the phosphate in the aqueous solution, phosphate ions dissociated from the phosphate are adsorbed on the dielectric film during the course of the electrolytic polymerization. Thus, the humidity resistance of the dielectric oxide film is improved, resulting in improvements in the capacitance and loss of the capacitor under high temperature and high humidity conditions. A fabrication method of the capacitor is also described.

REFERENCES:
patent: 4858078 (1989-08-01), Morimoto et al.
patent: 4943892 (1990-07-01), Tsuchiya et al.
patent: 4959753 (1990-09-01), Kudoh et al.

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