Conductive polymer solution, capacitor, and method for producing the capacitor

Patent metadata

Field	Value
Publication number	US-2018334577-A1
Application number	US-201615757876-A
Country	US
Kind code	A1
Filing date	Jul 19, 2016
Priority date	Sep 8, 2015
Publication date	Nov 22, 2018
Grant date	—

Abstract

[Object] To provide a conductive polymer solution capable of forming a capacitor having a large capacitance, low ESR, and excellent long-term reliability without using treatment solutions for conductive polymer layer formation differing in composition, and without forming an inside conductive polymer layer by different approaches, the capacitor and a method for producing the capacitor
[Solution] The present invention relates to: a conductive polymer solution which comprises a conductive polymer and a solvent, wherein the conductive polymer comprises a pi-conjugated conductive polymer, a polyanion with which the pi-conjugated conductive polymer has been doped, and a compound formed by reacting an oxirane or oxetane group with an anion making no contribution to the dope in the polyanion, and the solution has a pH in the range of 2.0 to 6.0; a capacitor which includes either the conductive polymer solution or the compounds remaining after removal of the solvent from the solution; and a method for producing a capacitor, comprising impregnating the capacitor with the conductive polymer solution and removing the solvent therefrom.

First claim

1 . A conductive polymer solution having a conductive polymer and a solvent, wherein
the conductive polymer comprises a pi-conjugated conductive polymer, a polyanion with which the pi-conjugated conductive polymer is doped, and a compound formed by reacting an oxirane or oxetane group which is needed to increase the strong acidity of a solution derived from the anion group of the polyanion to a weak acidic region of a pH in the range of 2.0 to 6.0 with an anion making no contribution to the dope in the polyanion, and the solution has a pH in the range of 2.0 to 6.0.

2 . The conductive polymer solution of claim 1 , wherein the pi-conjugated conductive polymer is polyethylenedioxythiophene.

3 . The conductive polymer solution of claim 1 , wherein the polyanion is polystyrenesulfonic acid.

4 . The conductive polymer solution claim 1 , wherein an organic compound containing the oxirane or oxetane group is one or two or more compounds selected from propylene oxide, glycidol, 2-[2-(2-butoxy-ethoxy)-ethoxy]-oxirane and 2-{2-[2-(2-butoxy-ethoxy)-ethoxy]-ethoxy}-oxirane.

5 . A capacitor including: an anode made of a porous body of a valve metal; a dielectric layer formed by oxidizing the anode surface; a conductive cathode disposed on a side opposite to the anode on the dielectric layer; and a solid electrolyte layer formed between the dielectric layer and the cathode, wherein
the capacitor comprises the conductive polymer solution of claim 1 or a compound formed by the removal of the solvent from the solution.

6 . A method for producing a capacitor, comprising impregnating the capacitor of claim 5 with the conductive polymer solution of claim 1 , and removing the solvent constituting the conductive polymer solution.

Assignees

• Shinetsu Polymer Co

Inventors

• Matsubayashi Sou
• Suzuki Ken-Ichi

Classifications

• C09D7/63

  organic · CPC title

• C09D165/00

  Coating compositions based on macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain (C09D107/00 - C09D157/00, C09D161/00 take precedence); Coating compositions based on derivatives of such polymers · CPC title

• C08G61/126

  with a five-membered ring containing one sulfur atom in the ring · CPC title

• C08G2261/1424

  containing ether groups, including alkoxy · CPC title

• H01G9/0036 Primary

  Formation of the solid electrolyte layer · CPC title