Electrolytic capacitor and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-2017256362-A1
Application number	US-201715597178-A
Country	US
Kind code	A1
Filing date	May 17, 2017
Priority date	Dec 1, 2014
Publication date	Sep 7, 2017
Grant date	—

Abstract

An electrolytic capacitor includes an anode body having a dielectric layer, and a solid electrolyte layer including a conductive polymer. The solid electrolyte layer includes the conductive polymer, an anion, and a cation. The anion is an anion corresponding to at least one acid selected from the group consisting of a phosphorus-containing oxoacid, sulfuric acid, and a carboxylic acid. The cation is a nitrogen-containing cation.

First claim

What is claimed is:

1 . An electrolytic capacitor comprising:
an anode body having a dielectric layer; and a solid electrolyte layer including a conductive polymer, wherein: the solid electrolyte layer includes the conductive polymer, an anion, and a cation, the anion is an anion corresponding to at least one acid selected from the group consisting of a phosphorus-containing oxoacid, sulfuric acid, and a carboxylic acid, and the cation is a nitrogen-containing cation.

2 . The electrolytic capacitor according to claim 1 , wherein the phosphorus-containing oxoacid includes phosphoric acid.

3 . The electrolytic capacitor according to claim 1 , wherein the nitrogen-containing cation is a cation derived from at least one nitrogen-containing base selected from the group consisting of ammonia and an amine.

4 . The electrolytic capacitor according to claim 1 , wherein the anion and the cation form a salt.

5 . The electrolytic capacitor according to claim 4 , wherein the salt is at least one selected from the group consisting of ammonium phosphate, diammonium hydrogen phosphate, and ammonium dihydrogen phosphate.

6 . The electrolytic capacitor according to claim 1 , wherein in the solid electrolyte layer, a content of the anion ranges from 0.1 parts by mass to 100 parts by mass, both inclusive, relative to 100 parts by mass of the conductive polymer in terms of the at least one acid that is free.

7 . The electrolytic capacitor according to claim 1 , wherein the solid electrolyte layer includes the cation and the anion in a ratio of 1 equivalent or more of the anion to 1 equivalent of the cation.

8 . The electrolytic capacitor according to claim 1 , the electrolytic capacitor further comprising an electrolyte solution.

9 . A method for manufacturing an electrolytic capacitor, the method comprising impregnating an anode body having a dielectric layer with a dispersion containing a conductive polymer, a solvent, an anion, and a cation, wherein:
the anion is an anion corresponding to at least one acid selected from the group consisting of a phosphorus-containing oxoacid, sulfuric acid, and a carboxylic acid, and the cation is a nitrogen-containing cation.

10 . A method for manufacturing an electrolytic capacitor, the method comprising:
impregnating an anode body having a dielectric layer with a dispersion containing a conductive polymer and a solvent; and impregnating the anode body impregnated by the dispersion with a treatment solution containing an anion and a cation, wherein: the anion is an anion corresponding to at least one acid selected from the group consisting of a phosphorus-containing oxoacid, sulfuric acid, and a carboxylic acid, and the cation is a nitrogen-containing cation.

11 . The method for manufacturing an electrolytic capacitor according to claim 9 , wherein the phosphorus-containing oxoacid includes phosphoric acid.

12 . The method for manufacturing an electrolytic capacitor according to claim 9 , wherein the nitrogen-containing cation is a cation derived from at least one nitrogen-containing base selected from the group consisting of ammonia and an amine.

13 . The method for manufacturing an electrolytic capacitor according to claim 9 , wherein the anion and the cation form a salt.

14 . The method for manufacturing an electrolytic capacitor according to claim 13 , wherein the salt is at least one selected from the group consisting of ammonium phosphate, diammonium hydrogen phosphate, and ammonium dihydrogen phosphate.

15 . The method for manufacturing an electrolytic capacitor according to claim 9 , wherein an amount of the anion ranges from 0.1 parts by mass to 100 parts by mass, both inclusive, relative to 100 parts by mass of the conductive polymer in terms of the at least one acid that is free.

16 . The method for manufacturing an electrolytic capacitor according to claim 9 , wherein the solvent contains a polyhydric alcohol.

17 . The method for manufacturing an electrolytic capacitor according to claim 10 , wherein the treatment solution further contains a polyhydric alcohol.

18 . The method for manufacturing an electrolytic capacitor according to claim 9 , the method further comprising impregnating the anode body with an electrolyte solution after impregnating the anode body with the dispersion.

19 . The method for manufacturing an electrolytic capacitor according to claim 10 , the method further comprising impregnating the anode body with an electrolyte solution after impregnating the anode body with the treatment solution.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Tsubaki Yuichiro

Classifications

• H01G9/028 Primary

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

• H01G2009/0014

  Electricity · mapped topic

• H01G9/15 Primary

  Solid electrolytic capacitors (H01G11/00 takes precedence) · CPC title

• H01G9/151

  with wound foil electrodes · CPC title

• H01G9/0036 Primary

  Formation of the solid electrolyte layer · CPC title