Solid electrolytic capacitor and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-10074484-B2
Application number	US-201514807948-A
Country	US
Kind code	B2
Filing date	Jul 24, 2015
Priority date	Jan 31, 2013
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

A solid electrolytic capacitor includes anode, dielectric layer formed on anode, and conductive polymer layer formed on dielectric layer. A surface of dielectric layer is dotted with coupling particles. Conductive polymer layer covers coupling particles and is also in contact with dielectric layer. This enables to increase a self-repair capability for reducing leak current between the anode and a cathode in the solid electrolytic capacitor having the conductive polymer layer as a solid electrolytic layer.

First claim

The invention claimed is:

1. A solid electrolytic capacitor comprising:
an anode;
a dielectric layer formed on the anode;
a conductive polymer layer formed on the dielectric layer; and
coupling particles dotting on a surface of the dielectric layer, wherein:
the coupling particles are chemically bonded with the dielectric layer, and
the conductive polymer layer covers the coupling particles and is also in contact with the dielectric layer.

2. The solid electrolytic capacitor of claim 1 , wherein the coupling particles are coupled with the conductive polymer layer by electric interaction.

3. The solid electrolytic capacitor of claim 1 , wherein the coupling particles are nanoparticles.

4. The solid electrolytic capacitor of claim 1 , wherein:
the anode is a bonded body of particles made of at least one of valve action metal and an alloy containing the valve action metal, and
some of the coupling particles agglutinate to form a secondary particle on a part of the dielectric layer, the part of the dielectric layer covering a grain boundary between the particles constituting the bonded body.

5. The solid electrolytic capacitor of claim 1 , wherein the coupling particles contain an oxide of metal described in one of third and fourth periods of a periodic table.

6. A method for manufacturing a solid electrolytic capacitor, the method comprising:
forming a dielectric layer on an anode;
dotting coupling particles on a surface of the dielectric layer by applying a dispersion liquid in which the coupling particles are dispersed, to the surface of the dielectric layer; and,
forming a conductive polymer layer on the surface of the dielectric layer where the coupling particles are dotted.

7. The method for manufacturing a solid electrolytic capacitor of claim 6 , wherein the coupling particles are electrically charged in the dispersion liquid.

8. A solid electrolytic capacitor comprising:
an anode;
a dielectric layer formed on the anode;
a conductive polymer layer formed on the dielectric layer; and
coupling particles dotting on a surface of the dielectric layer, wherein:
some of the coupling particles agglutinate to form a secondary particle, and
the conductive polymer layer covers the coupling particles and is also in contact with the dielectric layer.

9. The solid electrolytic capacitor of claim 8 , wherein:
the anode is a bonded body of particles made of at least one of valve action metal and an alloy containing the valve action metal, and
the secondary particle of the coupling particles is dotted on a part of the dielectric layer, the part of the dielectric layer covering a grain boundary between the particles constituting the bonded body.

10. The solid electrolytic capacitor of claim 8 , wherein the coupling particles are nanoparticles.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Morioka Ryo

Classifications

• H01G9/028 Primary

  Organic semiconducting electrolytes, e.g. TCNQ · CPC title

• H01G9/0036

  Formation of the solid electrolyte layer · CPC title

• H01G9/042

  characterised by the material (H01G11/22 takes precedence) · CPC title

• H01G9/052

  Sintered electrodes · CPC title