Solid electrolytic capacitor

Abstract

Provided is a solid electrolytic capacitor excellent in reliability, particularly in ESR property. In a solid electrolytic capacitor having a solid electrolyte layer, the solid electrolyte layer has a conductive polymer layer formed by a chemical polymerization method or an electrolytic polymerization method, using a polymerization liquid containing at least a monomer and a dopant-introducing agent. The dopant-introducing agent contains a dopant-introducing agent containing at least alkylammonium ions as a cationic component. The dopant-introducing agent in the polymerization liquid may further contain a dopant-introducing agent containing at least metal ions as a cationic component.

1 . A solid electrolytic capacitor having a solid electrolyte layer, wherein
 said solid electrolyte layer has a conductive polymer layer formed by a chemical polymerization method and/or an electrolytic polymerization method, using a polymerization liquid containing at least a monomer and a dopant-introducing agent, and   said polymerization liquid contains the dopant-introducing agent containing at least alkylammonium ions as a cationic component.   
   
   
       2 . The solid electrolytic capacitor according to  claim 1 , wherein said alkylammonium ions are primary ammonium ions. 
   
   
       3 . The solid electrolytic capacitor according to  claim 1 , wherein an alkyl group of said alkylammonium ion has a carbon number of 1 to 4. 
   
   
       4 . The solid electrolytic capacitor according to  claim 1 , wherein an anionic component of the dopant-introducing agent containing at least the alkylammonium ions as said cationic component is aromatic sulfonic acid ions. 
   
   
       5 . The solid electrolytic capacitor according to  claim 4 , wherein said aromatic sulfonic acid ions are tetralin sulfonic acid ions. 
   
   
       6 . The solid electrolytic capacitor according to  claim 1 , wherein said polymerization liquid further contains a dopant-introducing agent containing metal ions as a cationic component. 
   
   
       7 . The solid electrolytic capacitor according to  claim 6 , wherein an anionic component of the dopant-introducing agent containing at least the metal ions as said cationic component is naphthalene sulfonic acid ions or anions of a derivative thereof. 
   
   
       8 . The solid electrolytic capacitor according to  claim 1 , wherein said monomer is pyrrole or a derivative thereof.