Wet capacitor cathode containing an alkyl-substituted poly(3,4-ethylenedioxythiophene)

Patent metadata

Field	Value
Publication number	US-8971019-B2
Application number	US-201313783766-A
Country	US
Kind code	B2
Filing date	Mar 4, 2013
Priority date	Mar 16, 2012
Publication date	Mar 3, 2015
Grant date	Mar 3, 2015

Abstract

A wet electrolytic capacitor that contains an anodically oxidized porous anode body, a cathode containing a metal substrate coated with a conductive coating, and a working electrolyte that wets the dielectric on the anode. The conductive coating contains an alkyl-substituted poly(3,4-ethylenedioxythiophene) having a certain structure. Such polymers can result in a higher degree of capacitance than many conventional types of coating materials. Further, because the polymers are generally semi-crystalline or amorphous, they can dissipate and/or absorb the heat associated with the high voltage. The degree of surface contact between the conductive coating and the surface of the metal substrate may also be enhanced in the present invention by selectively controlling the manner in which the conductive coating is formed.

First claim

What is claimed is:

1. A wet electrolytic capacitor comprising:
an anode comprising a sintered porous anode body that is coated with a dielectric;
a cathode that comprises a metal substrate over which is disposed a conductive polymer coating, wherein the conductive polymer coating contains an alkyl-substituted poly(3,4-ethylenedioxythiophene) having the following general structure:…

Assignees

• Avx Corp

Inventors

• Biler Martin

Classifications

• C25D9/02

  Chemistry & Metallurgy · mapped topic

• C09D5/4476

  Chemistry & Metallurgy · mapped topic

• H01G9/08

  Electricity · mapped topic

• H01G9/145 Primary

  Electricity · mapped topic

• H01G9/0425 Primary

  Electricity · mapped topic