Solid electrolytic capacitor

Patent metadata

Field	Value
Publication number	US-9761377-B2
Application number	US-201414548696-A
Country	US
Kind code	B2
Filing date	Nov 20, 2014
Priority date	Apr 16, 2008
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

An electrically conductive polymer composition has high electrical conductivity, excellent water resistance, high density, and excellent smoothness. Also disclosed is a solid electrolyte capacitor which is prevented from the reduction in electrical conductivity, has low ESR, and also has excellent reliability. Further disclosed is a method for producing the solid electrolyte capacitor. The electrically conductive polymer composition is produced by removing a dispersion medium from an electrically conductive polymer suspension, wherein the electrically conductive polymer suspension includes: an electrically conductive polymer material including a dopant composed of a polyacid or a salt thereof and an electrically conductive polymer; at least one compound (A) selected from erythritol, xylitol and pentaerythritol; and the dispersion medium.

First claim

What is claimed is:

1. A solid electrolytic capacitor comprising:
a solid electrolyte layer comprising an electrically conductive polymer composition comprising dehydrated and polymerized pentaerythritol;
wherein the electrically conductive polymer composition is obtained by heating an electrically conductive polymer suspension comprising an electrically conductive polymer material comprising a dopant composed of a polyacid or a salt thereof and an electrically conductive polymer; pentaerythritol; and a dispersion medium at a temperature equal to or higher than 150° C. and less than 270° C., thereby removing the dispersion medium from the electrically conductive polymer suspension and dehydrating and polymerizing the pentaerythritol.

2. The solid electrolytic capacitor according to claim 1 , further comprising an anode body made of a valve action metal, and a dielectric layer formed on the surface of the anode body, wherein the solid electrolyte layer is formed on the dielectric layer.

3. The solid electrolytic capacitor according to claim 1 , wherein the electrically conductive polymer material comprises, as the dopant, a polysulfonic acid or a polycarboxylic acid.

4. The solid electrolytic capacitor according to claim 3 , wherein the electrically conductive polymer material comprises, as the dopant, a polystyrene sulfonic acid or a polyester sulfonic acid.

5. The solid electrolytic capacitor according to claim 1 , wherein the electrically conductive polymer material comprises, as the electrically conductive polymer, a polymer obtained by polymerizing at least one monomer selected from a group consisting of pyrrole, thiophene, aniline and derivatives thereof.

6. The solid electrolytic capacitor according to claim 2 , wherein the valve action metal is at least one selected from the group consisting of aluminum, tantalum and niobium.

Assignees

• Tokin Corp

Inventors

• Nobuta Tomoki
• Kobayakawa Ryuta
• Takahashi Naoki
• Sugawara Yasuhisa
• Suzuki Satoshi

Classifications

• C08K2201/001

  Conductive additives · CPC title

• H01B1/127

  comprising five-membered aromatic rings in the main chain, e.g. polypyrroles, polythiophenes · CPC title

• H01G9/025 Primary

  Solid electrolytes (H01G11/54 takes precedence) · CPC title

• C08L101/12

  characterised by physical features, e.g. anisotropy, viscosity or electrical conductivity (liquid crystal materials or compositions C09K19/00) · CPC title

• H01G9/0036

  Formation of the solid electrolyte layer · CPC title