Patent ID: 7684172
Filing Date: 2010-03-23
Classification: H01G,Y02E

Abstract:
1. A solid electrolytic capacitor comprising: a valve metal formed with an anodized film; an inner conductive polymer film formed on the anodized film; and an outer conductive polymer film formed on the inner conductive polymer film, wherein the outer conductive polymer film is obtained by: preparing a first polymer solution comprising polyethylenedioxythiophene and polystyrenesulfonic acid; dissolving a predetermined dissolved substance in a non-aqueous solvent, the predetermined dissolved substance being polystyrenesulfonic acid or its salt, the polystyrenesulfonic acid or its salt having an average molecular weight of 10,000 to 500,000; mixing the dissolved substance in the non-aqueous solvent with pure water to obtain an additive solution; adding the additive solution into the first polymer solution to obtain a second polymer solution; and applying the second polymer solution to the inner conductive polymer film.