# US 11,908,630 B2 · Solid electrolytic capacitor using a doped conductive polymer

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,908,630 B2
- Document ID: US11908630B2
- Status: Granted
- Kind: B2
- Application number: 17/659,620
- Filed: 2022-04-18
- Published: 2022-10-27
- Granted: 2024-02-20
- Earliest claimed: 2021-04-23
- Assignees: Tokin Corporation
- Applicants: TOKIN Corporation
- Inventors: Yusuke Hoshina; Masami Ishijima; Tadamasa Asami; Yasuhisa Sugawara
- Web page: https://patentgrep.com/patent/US11908630B2

## CPC

- H01G 9/0036: {Formation of the solid electrolyte layer}
- H01G 9/025: Solid electrolytes (H01G11/54 takes precedence)
- H01G 9/15: Solid electrolytic capacitors (H01G11/00 takes precedence)
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)

## Abstract

A solid electrolytic capacitor according to an aspect includes an anode body made of a valve metal, a dielectric layer formed on the anode body, a solid electrolyte layer formed on the dielectric layer, and a cathode body layer formed on the solid electrolyte layer. The solid electrolyte layer includes a first layer containing a first conductive polymer doped with a monomolecular dopant, and a second conductive polymer composed of a self-doped-type conductive polymer containing a plurality of side chains containing a functional group, the functional group being able to be doped, and a second layer formed on the first layer and containing a third conductive polymer doped with a polymer dopant; and the first conductive polymer is in contact with the third conductive polymer (the second layer).

## Claims

### Claim 1

A method for manufacturing a solid electrolytic capacitor comprising:
forming a dielectric layer on an anode body made of a valve metal;
forming a solid electrolyte layer on the dielectric layer; and
forming a cathode body layer on the solid electrolyte layer, wherein
the forming of the solid electrolyte layer comprises:
forming a first layer by forming, after forming a first conductive polymer on the dielectric layer by using chemical polymerization, a second conductive polymer composed of a self-doped-type conductive polymer;
removing excessive second conductive polymer formed on the surface of the first conductive polymer by washing the first layer; and
forming a second layer containing a third conductive polymer on the first layer by using a suspension containing a conductive polymer doped with a polymer dopant, wherein
the first conductive polymer has a sponge-like structure, and
when the second layer is formed, the third conductive polymer enters into voids of the sponge-like structure of the first conductive polymer so that the first conductive polymer comes into contact with the third conductive polymer.