Electrolytic capacitor and liquid component for electrolytic capacitor

Patent metadata

Field	Value
Publication number	US-12562317-B2
Application number	US-202318502118-A
Country	US
Kind code	B2
Filing date	Nov 6, 2023
Priority date	Nov 29, 2022
Publication date	Feb 24, 2026
Grant date	Feb 24, 2026

Abstract

An electrolytic capacitor includes a capacitor element and a liquid component. The capacitor element includes an anode body including a dielectric layer on a surface of the anode body, and a solid electrolyte layer covering at least a part of a surface of the dielectric layer. The solid electrolyte layer contains a conductive polymer component, and the liquid component contains a first polymer component. The first polymer component includes a carbon chain whose main chain does not contain a heteroatom at a position other than a terminal of the main chain. Units constituting the first polymer component include at least one first unit selected from the group consisting of a (meth)acrylic acid-based unit having a carboxy group and a vinyl alcohol-based unit having a hydroxy group. A proportion of the at least one first unit in an entirety of the units constituting the first polymer component is more than 50 mass %.

First claim

What is claimed is:

1 . An electrolytic capacitor comprising:
a capacitor element; and a liquid component, wherein: the capacitor element includes an anode body including a dielectric layer on a surface of the anode body, and a solid electrolyte layer covering at least a part of a surface of the dielectric layer, the solid electrolyte layer contains a conductive polymer component, the liquid component contains a first polymer component, the first polymer component includes a carbon chain whose main chain does not contain a heteroatom at a position other than a terminal of the main chain, units constituting the first polymer component include at least one first unit selected from the group consisting of a (meth)acrylic acid-based unit having a carboxy group and a vinyl alcohol-based unit having a hydroxy group, a proportion of the at least one first unit in an entirety of the units constituting the first polymer component is more than 50 mass %, and a number of carbon atoms in the main chain ranges from 4 to 1000, inclusive.

2 . The electrolytic capacitor according to claim 1 , wherein a weight-average molecular weight of the first polymer component ranges from 200 to 20,000, inclusive.

3 . The electrolytic capacitor according to claim 1 , wherein the first polymer component contains at least one selected from the group consisting of poly(meth)acrylic acid, polyvinyl alcohol, and a copolymer of (meth)acrylic acid and vinyl alcohol.

4 . The electrolytic capacitor according to claim 1 , wherein a content proportion of the first polymer component in the liquid component is more than or equal to 10 mass %.

5 . The electrolytic capacitor according to claim 1 , wherein the liquid component contains an alcohol-based solvent.

6 . The electrolytic capacitor according to claim 5 , wherein the alcohol-based solvent contains at least one selected from the group consisting of a glycol compound, a glycerin compound, and a derivative thereof.

7 . The electrolytic capacitor according to claim 6 , wherein the alcohol-based solvent contains at least one selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, glycerin, and polyglycerin.

8 . A liquid component for an electrolytic capacitor, the liquid component being used for the electrolytic capacitor including a solid electrolyte layer containing a conductive polymer component,
the liquid component including a first polymer component, wherein: the first polymer component includes a carbon chain whose main chain does not contain a heteroatom at a position other than a terminal of the main chain, units constituting the first polymer component include at least one first unit selected from the group consisting of a (meth)acrylic acid-based unit having a carboxy group and a vinyl alcohol-based unit having a hydroxy group, a proportion of the at least one first unit in an entirety of the units constituting the first polymer component is more than 50 mass %, and a number of carbon atoms in the main chain ranges from 4 to 2000, inclusive.

9 . The liquid component according to claim 8 , wherein a weight-average molecular weight of the first polymer component ranges from 200 to 20,000, inclusive.

10 . The liquid component according to claim 8 , wherein the first polymer component contains at least one selected from the group consisting of poly(meth)acrylic acid, polyvinyl alcohol, and a copolymer of (meth)acrylic acid and vinyl alcohol.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Tsubaki Yuichiro
• CHASHIRO Kenta
• Arima Hiroyuki

Classifications

• H01G9/145

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

• C08K5/053

  Polyhydroxylic alcohols · CPC title

• C08K5/45

  Heterocyclic compounds having sulfur in the ring · CPC title

• C08K5/1539

  Cyclic anhydrides · CPC title

• H01G9/15 Primary

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