ELECTROLYTIC CAPACITOR

• US 20190006111A1
• Filed: 09/05/2018
• Published: 01/03/2019
• Est. Priority Date: 03/16/2016
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: TSUBAKI, YUICHIRO, AOYAMA, TATSUJI
• Granted Patent: US 10,643,795 B2
• Time in Patent Office: Days
• CPC Class Codes: C08G 2261/3223 containing one or more sulfur atoms as the only heteroatom, e.g. thiophene
• CPC Class Codes: C08G 2261/794 with polymeric dopants
• CPC Class Codes: C08G 61/126 with a five-membered ring containing one sulfur atom in the ring
• CPC Class Codes: C08K 5/20 Carboxylic acid amides
• CPC Class Codes: C08L 65/00 Compositions of macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain C08L7/00 - C08L57/00, C08L61/00 take precedence; Compositions of derivatives of such polymers
• CPC Class Codes: H01G 11/48 Conductive polymers
• CPC Class Codes: H01G 9/0036 Formation of the solid electrolyte layer
• CPC Class Codes: H01G 9/025 Solid electrolytes H01G11/54 takes precedence
• CPC Class Codes: H01G 9/028 Organic semiconducting electrolytes, e.g. TCNQ
• CPC Class Codes: H01G 9/035 Liquid electrolytes, e.g. impregnating materials H01G11/54 takes precedence
• CPC Class Codes: H01G 9/145 Liquid electrolytic capacitors H01G11/00 takes precedence
• CPC Class Codes: H01G 9/15 Solid electrolytic capacitors H01G11/00 takes precedence

Abstract

An electrolytic capacitor includes an anode body with a dielectric layer; a solid electrolyte layer in contact with the dielectric layer; and an electrolytic solution. The solid electrolyte layer includes a π-conjugated conductive polymer and a first sulfonic acid. The electrolytic solution includes a solvent and an acid component. And the acid component includes a second sulfonic acid.

Claims

1. An electrolytic capacitor comprising:

an anode body with a dielectric layer;

a solid electrolyte layer in contact with the dielectric layer; and

an electrolytic solution, wherein;

the solid electrolyte layer includes a π

-conjugated conductive polymer and a first sulfonic acid,

the electrolytic solution includes a solvent and an acid component, and

the acid component includes a second sulfonic acid.

2. The electrolytic capacitor according to claim 1, wherein a molecular weight of the second sulfonic acid is lower than a molecular weight of the first sulfonic acid.

3. The electrolytic capacitor according to claim 1, wherein a concentration of the second sulfonic acid in the electrolytic solution ranges from 5% by mass to 50% by mass, inclusive.

4. The electrolytic capacitor according to claim 1, wherein

the acid component includes a third acid component, and

the third acid component is an acid other than a sulfuric acid and a sulfonic acid.

5. The electrolytic capacitor according to claim 4, wherein the third acid component includes a carboxylic acid.

6. The electrolytic capacitor according to claim 1, wherein the electrolytic solution includes a base component, and includes the acid component more excessively than the base component in equivalence ratio.

7. The electrolytic capacitor according to claim 6, wherein the base component is at least one selected from the group consisting of ammonia, a primary amine, a secondary amine, a tertiary amine, a quaternary ammonium compound, and an amidinium compound.

8. The electrolytic capacitor according to claim 1, wherein the first sulfonic acid includes a polystyrenesulfonic acid.

9. The electrolytic capacitor according to claim 1, wherein the second sulfonic acid includes an aromatic sulfonic acid.

10. The electrolytic capacitor according to claim 9, wherein the aromatic sulfonic acid includes a hydroxy group or a carboxy group in addition to a sulfo group.

11. The electrolytic capacitor according to claim 1, wherein the solvent includes at least one selected from the group consisting of γ

-butyrolactone, sulfolane, and ethylene glycol.

12. The electrolytic capacitor according to claim 1, wherein the π

-conjugated conductive polymer is polythiophene or a derivative of the polythiophene.