SOLID ELECTROLYTE CAPACITOR AND ITS MANUFACTURE

Title:

SOLID ELECTROLYTE CAPACITOR AND ITS MANUFACTURE

Document Type and Number:

WIPO Patent Application WO/1997/041577

Kind Code:

A1

Abstract:

Dense and uniform solid electrolyte layers made of conductive polymer are formed in a winding type capacitor to obtain a large capacitance solid electrolyte capacitor having excellent electrical characteristics. An anode foil (1) and a cathode foil (2) are wound with separators (3) therebetween to form a capacitor element (10) which is impregnated with mixture solution made of 3,4-ethylene dioxythyophene and an oxidizing agent. The mixture solution permeates into the inside of the capacitor element (10). By gentle polymerization reaction between 3,4-ethylene dioxythyophene and the oxidizing agent in the process of permeation. After the permeation, polyethylene dioxythyophene layers, i.e. solid electrolyte layers, are formed in the capacitor element (10). Further, a low impedance solid electrolyte capacitor in which the electrolyte layers are well formed can be provided. 3,4-Ethylene dioxythyophene is polymerized by the oxidizing agent in a solvent consisting of one or two among secondary alcohol, tertiary alcohol and delivertive of secondary alcohol. By this process, the polymerization reaction can be maintained in a satisfactory state, and accelerated. Thus, polyethylene dioxythyophene electrolyte layers having a high degree of polymerization and a high conductivity is provided.

Inventors:

HATANAKA KAZUHIRO (JP)
KANEKO ATSUKO (JP)

Application Number:

PCT/JP1997/001114

Publication Date:

November 06, 1997

Filing Date:

March 31, 1997

Export Citation:

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Assignee:

NIPPON CHEMICON (JP)
HATANAKA KAZUHIRO (JP)
KANEKO ATSUKO (JP)

International Classes:

H01G9/02; H01G9/025; (IPC1-7): H01G9/028

Foreign References:

JPH0215611A	1990-01-19
JPH02186616A	1990-07-20
JPH02288215A	1990-11-28

Other References: