Electrolytic capacitor and method for producing same

Patent metadata

Field	Value
Publication number	US-2022367120-A1
Application number	US-202217813606-A
Country	US
Kind code	A1
Filing date	Jul 20, 2022
Priority date	Jan 31, 2020
Publication date	Nov 17, 2022
Grant date	—

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, and the electrolyte layer contains a first conductive polymer and a non-aqueous solvent, the first conductive polymer being a self-doped conductive polymer.

2 . The electrolytic capacitor according to claim 1 , wherein the electrolyte layer further contains a second conductive polymer doped with a dopant.

3 . The electrolytic capacitor according to claim 2 , 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.

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

5 . The electrolytic capacitor according to claim 2 , wherein a total mass of the second conductive polymer and the dopant contained in the electrolyte layer is greater than a mass of the first conductive polymer contained in the electrolyte layer.

6 . The electrolytic capacitor according to claim 2 , 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.

7 . The electrolytic capacitor according to claim 2 , wherein the dopant is polystyrenesulfonic acid, and
the second conductive polymer is poly(3,4-ethylenedioxythiophene).

8 . A method for manufacturing an electrolytic capacitor, the method comprising:
a step (i) of preparing a capacitor element precursor that includes an anode body having a dielectric layer on a surface of the anode body; a step (ii) of forming a polymer layer containing a first conductive polymer to be adjacent to the dielectric layer by an impregnation treatment, the first conductive polymer being a self-doped conductive polymer; and a step (iii) of impregnating the polymer layer with a non-aqueous solvent.

9 . The method according to claim 8 , wherein the polymer layer contains the first conductive polymer and a second conductive polymer, the second conductive polymer being doped with a dopant.

10 . The method according to claim 9 , wherein:
the dopant is a polymer dopant containing an acidic group, and the step (iii) is a step of impregnating the polymer layer with an electrolytic solution containing the non-aqueous solvent and a base component dissolved in the non-aqueous solvent.

11 . The method according to claim 9 , wherein the impregnation treatment of the step (ii) is an impregnation treatment (x) of impregnating the capacitor element precursor with a liquid containing the first conductive polymer and the second conductive polymer, the second conductive polymer being doped with the dopant.

12 . The method according to claim 9 , wherein the impregnation treatment of the step (ii) includes:
an impregnation treatment (y) of impregnating the capacitor element precursor with a first liquid containing the first conductive polymer, and an impregnation treatment (z) of impregnating the capacitor element precursor with a second liquid containing the second conductive polymer, the second conductive polymer being doped with the dopant.

13 . The method according to claim 12 , wherein the impregnation treatment (y) is performed after the impregnation treatment (z).

14 . The method according to claim 9 , 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

• H01G9/025 Primary

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

• H01G9/028 Primary

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

• H01G9/0036

  Formation of the solid electrolyte layer · CPC title

• H01G9/035

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

• H01G9/15

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