Process for producing polymer capacitors for high reliability applications

A method for manufacturing a capacitor, comprising the method steps:

• a) provision of a porous electrode body made of an electrode material wherein a dielectric at least partially covers a surface of this electrode material;
• b) introduction of a liquid composition which comprises an electrically conductive polymer, at least one high-boiling solvent having a boiling point (determined at 1013.25 hPa) of at least 150° C. and of not more than 275° C. and optionally a dispersing agent into at least a part of the porous electrode body provided in process step a) and at least partial removal of the high-boiling solvent and, if present, of the dispersing agent for the formation of a solid electrolyte that at least partially covers a surface of the dielectric;
• c) filling at least a part of the pores of the porous electrode body obtained in process step b) with an impregnation solution comprising at least one impregnation solvent, wherein the at least one impregnation solvent comprises at least one hydroxy group and has a molecular weight in the range from 70 to 180 g/mol;
• and,
• d) encapsulation of the porous electrode body obtained in process step c).