Electrolytic capacitor and method for producing same

Patent metadata

Field	Value
Publication number	US-12073999-B2
Application number	US-202217813606-A
Country	US
Kind code	B2
Filing date	Jul 20, 2022
Priority date	Jan 31, 2020
Publication date	Aug 27, 2024
Grant date	Aug 27, 2024

Abstract

An electrolytic capacitor includes a capacitor element. The capacitor element includes an anode body and an electrolyte layer. The anode body has a dielectric layer on a surface of the anode body. The electrolyte layer is disposed to be adjacent to the dielectric layer. The electrolyte layer contains a first conductive polymer and a non-aqueous solvent. The first conductive polymer is a self-doped conductive polymer.

First claim

What is claimed is:

1. An electrolytic capacitor comprising a capacitor element, wherein:
the capacitor element includes an anode body and an electrolyte layer, the anode body having a dielectric layer on a surface of the anode body, the electrolyte layer being disposed adjacent to the dielectric layer,
the electrolyte layer contains a first conductive polymer, a second conductive polymer doped with a dopant, and a non-aqueous solvent, the first conductive polymer being a self-doped conductive polymer, and
the following relation is satisfied,
1.1≤ W 2/ W 1≤9,

where W1 represents a mass of the first conductive polymer contained in the electrolyte layer, and W2 represents a total mass of the second conductive polymer and the dopant contained in the electrolyte layer.

2. The electrolytic capacitor according to claim 1 , wherein the dopant is a polymer dopant containing an acidic group, and
the electrolyte layer contains an electrolytic solution containing the non-aqueous solvent and a base component dissolved in the non-aqueous solvent.

3. The electrolytic capacitor according to claim 2 , wherein a proportion of the base component in the electrolytic solution ranges from 0.1 mass % to 20 mass %, inclusive.

4. The electrolytic capacitor according to claim 1 , wherein the following relation is satisfied,
1.2≤ W 2/ W 1≤9 is satisfied.

5. The electrolytic capacitor according to claim 1 , wherein:
the electrolyte layer includes a polymer layer constituted by the first conductive polymer and the second conductive polymer, the second conductive polymer being doped with the dopant,
the polymer layer includes a first polymer layer and a second polymer layer, the first polymer layer being disposed on the dielectric layer, the second polymer layer being disposed on the first polymer layer, and
a content proportion of the second conductive polymer in the first polymer layer is greater than a content proportion of the second conductive polymer in the second polymer layer.

6. The electrolytic capacitor according to claim 1 , wherein the dopant is polystyrenesulfonic acid, and
the second conductive polymer is poly(3,4-ethylenedioxythiophene).

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Arima Hiroyuki
• Kobayashi Takehiro

Classifications

• H01G9/035

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

• H01G9/0036

  Formation of the solid electrolyte layer · CPC title

• H01G9/025 Primary

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

• H01G9/15

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

• H01G9/145

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