Electrolytic capacitor

Patent metadata

Field	Value
Publication number	US-2018197685-A1
Application number	US-201815915109-A
Country	US
Kind code	A1
Filing date	Mar 8, 2018
Priority date	Sep 28, 2015
Publication date	Jul 12, 2018
Grant date	—

Abstract

An electrolytic capacitor includes an anode body having a dielectric layer; a solid electrolyte layer in contact with the dielectric layer of the anode body; and an electrolytic solution. The electrolytic solution contains a solvent and a solute. The solvent contains a glycol compound. The solute contains an acid component and a base component. A mass of the acid component in the solute is greater than a mass of the base component in the solute. The acid component contains a first aromatic compound having a hydroxyl group.

First claim

What is claimed is:

1 . An electrolytic capacitor comprising:
an anode body having a dielectric layer; a solid electrolyte layer in contact with the dielectric layer of the anode body; and an electrolytic solution, wherein: the electrolytic solution contains a solvent and a solute, the solvent contains a glycol compound, the solute contains an acid component and a base component, a mass of the acid component in the solute is greater than a mass of the base component in the solute, and the acid component contains a first aromatic compound having a hydroxyl group.

2 . The electrolytic capacitor according to claim 1 , wherein a proportion of the glycol compound in the solvent is 50% by mass or more.

3 . The electrolytic capacitor according to claim 1 , wherein the glycol compound contains at least one selected from the group consisting ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, and polyethylene glycol having a molecular weight of from 190 to 400, inclusive.

4 . The electrolytic capacitor according to claim 1 , wherein the glycol compound contains ethylene glycol.

5 . The electrolytic capacitor according to claim 1 , wherein the electrolytic solution has a pH of 4 or less.

6 . The electrolytic capacitor according to claim 1 , wherein the first aromatic compound has two or more hydroxyl groups.

7 . The electrolytic capacitor according to claim 6 , wherein the first aromatic compound is at least one selected from a group consisting of catechol and pyrogallol.

8 . The electrolytic capacitor according to claim 1 , wherein a proportion of the first aromatic compound in the electrolytic solution ranges from 0.1% by mass to 30% by mass, inclusive.

9 . The electrolytic capacitor according to claim 1 , wherein a proportion of the solute in the electrolytic solution ranges from 2% by mass to 32% by mass, inclusive.

10 . The electrolytic capacitor according to claim 1 , wherein the acid component further contains a carboxylic acid.

11 . The electrolytic capacitor according to claim 10 , wherein a part of the carboxylic acid is derived from a salt of the carboxylic acid component and the base component.

12 . The electrolytic capacitor according to claim 10 , wherein the carboxylic acid contains a second aromatic compound having two or more carboxyl groups.

13 . The electrolytic capacitor according to claim 12 , wherein the second aromatic compound is at least one selected from a group consisting of o-phthalic acid and pyromellitic acid.

14 . The electrolytic capacitor according to claim 1 , wherein the base component is at least one selected from a group consisting of a primary amine, a secondary amine, and a tertiary amine.

15 . The electrolytic capacitor according to claim 1 , wherein the solid electrolyte layer contains a conductive polymer and a polymer dopant.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Tsubaki Yuichiro
• Aoyama Tatsuji

Classifications

• H01G9/025

  Solid electrolytes (H01G11/54 takes precedence) · CPC title

• H01G9/035 Primary

  Liquid electrolytes, e.g. impregnating materials (H01G11/54 takes precedence) · CPC title

• H01G9/07

  Dielectric layers · CPC title

• H01G9/0003

  Protection against electric or thermal overload; cooling arrangements; means for avoiding the formation of cathode films (H01G9/12 takes precedence) · CPC title

• H01G9/028

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