Patent ID: 6409777
Filing Date: 2002-06-25
Classification: H01G,Y02E

Abstract:
A manufacturing method of solid electrolytic capacitor comprising the steps of:(a) supplying an anode electrode having a first undulated surface, wherein said anode electrode having said first undulated surface comprises a roughened metal foil, (b) forming a dielectric oxide layer on said first undulated surface, said dielectric oxide layer having a second undulated surface coinciding with said firse undulated surface, (c) forming a manganese dioxide layer on said second undulated surface, said manganese dioxide layer having a third undulated surface continuously coinciding with said second undulated surface, wherein said step of forming said manganese dioxide layer comprises the steps of(i) immersing said anode electrode comprising said dielectric oxide layer in an aqueous solution of manganese nitrate having a concentration in the range of about 6.5 wt % to about 26.5 wt % and adhering manganese nitrite to said electrode comprising said dielectric oxide layer, (ii) removing said anode electrode comprising said dielectric oxide layer from said aqueous solution of manganese nitrate, and (iii) pyrolysing said manganese nitrate adhered to said anode electrode comprising said dielectric oxide layer and forming said manganese oxide layer; wherein said manganese dioxide layer comprises about 5 ng to about 15 ng per 1 mm2 of the second undulated surface,(d) forming a conductive polymer layer on said third undulated surface, and (e) forming a cathode layer above said conductive polymer layer.