Electrolytic capacitor and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-2018233292-A1
Application number	US-201815952235-A
Country	US
Kind code	A1
Filing date	Apr 13, 2018
Priority date	Oct 30, 2015
Publication date	Aug 16, 2018
Grant date	—

Abstract

An electrolytic capacitor includes a capacitor element, a solid electrolyte layer, and an electrolyte solution. The capacitor element includes an anode body on a surface of which a dielectric layer is formed. The solid electrolyte layer is provided on the dielectric layer and includes a conductive polymer and a polymer dopant. The electrolyte solution is impregnated into the capacitor element and contains a polyhydric alcohol and a borate ester.

First claim

What is claimed is:

1 . An electrolytic capacitor comprising:
a capacitor element including an anode body on a surface of which a dielectric layer is formed; a solid electrolyte layer provided on the dielectric layer, the solid electrolyte layer including a conductive polymer and a polymer dopant; and an electrolyte solution with which the capacitor element is impregnated, the electrolyte solution containing a polyhydric alcohol and a borate ester.

2 . The electrolytic capacitor according to claim 1 , wherein a content proportion of moisture in the electrolyte solution ranges from 0.1% by mass to 3% by mass, inclusive.

3 . The electrolytic capacitor according to claim 1 , wherein a content proportion of the borate ester in the electrolyte solution ranges from 2% by mass to 60% by mass, inclusive.

4 . The electrolytic capacitor according to claim 2 , wherein a content proportion of the borate ester in the electrolyte solution ranges from 2% by mass to 60% by mass, inclusive.

5 . The electrolytic capacitor according to claim 1 , wherein a content proportion of the polyhydric alcohol in the electrolyte solution is 15% by mass or more.

6 . The electrolytic capacitor according to claim 2 , wherein a content proportion of the polyhydric alcohol in the electrolyte solution is 15% by mass or more.

7 . The electrolytic capacitor according to claim 3 , wherein a content proportion of the polyhydric alcohol in the electrolyte solution is 15% by mass or more.

8 . The electrolytic capacitor according to claim 1 , wherein the polyhydric alcohol includes ethylene glycol or a polyalkylene glycol.

9 . The electrolytic capacitor according to claim 1 , wherein the electrolyte solution further contains a carboxylic acid or a salt of the carboxylic acid.

10 . The electrolytic capacitor according to claim 1 , wherein the electrolyte solution further contains a composite compound of an organic acid and an inorganic acid, or a salt of the composite compound.

11 . A method for manufacturing an electrolytic capacitor, the method comprising:
preparing a capacitor element including an anode body on a surface of which a dielectric layer is formed; forming a solid electrolyte layer on the dielectric layer with use of a dispersion containing a conductive polymer, a polymer dopant, and a solvent; and impregnating the capacitor element having the solid electrolyte layer with an electrolyte solution containing a polyhydric alcohol and a borate ester.

12 . The method for manufacturing an electrolytic capacitor according to claim 11 , wherein a content proportion of moisture in the electrolyte solution ranges from 0.1% by mass to 3% by mass, inclusive.

13 . The method for manufacturing an electrolytic capacitor according to claim 11 , wherein a content proportion of the borate ester in the electrolyte solution ranges from 2% by mass to 60% by mass, inclusive.

14 . The method for manufacturing an electrolytic capacitor according to claim 12 , wherein a content proportion of the borate ester in the electrolyte solution ranges from 2% by mass to 60% by mass, inclusive.

15 . The method for manufacturing an electrolytic capacitor according to claim 11 , wherein a content proportion of the polyhydric alcohol in the electrolyte solution is 15% by mass or more.

16 . The method for manufacturing an electrolytic capacitor according to claim 12 , wherein a content proportion of the polyhydric alcohol in the electrolyte solution is 15% by mass or more.

17 . The method for manufacturing an electrolytic capacitor according to claim 13 , wherein a content proportion of the polyhydric alcohol in the electrolyte solution is 15% by mass or more.

18 . The method for manufacturing an electrolytic capacitor according to claim 11 , wherein the polyhydric alcohol includes ethylene glycol or a polyalkylene glycol.

19 . The method for manufacturing an electrolytic capacitor according to claim 11 , wherein the electrolyte solution further contains a carboxylic acid or a salt of the carboxylic acid.

20 . The method for manufacturing an electrolytic capacitor according to claim 11 , wherein the electrolyte solution further contains a composite compound of an organic acid and an inorganic acid, or a salt of the composite compound.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Tsubaki Yuichiro
• Aoyama Tatsuji

Classifications

• H01G9/0036

  Formation of the solid electrolyte layer · CPC title

• 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

• H01G9/15

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