# US 12,183,518 B2 · Electrolytic capacitor and method for production thereof

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

- Number: US 12,183,518 B2
- Document ID: US12183518B2
- Status: Granted
- Kind: B2
- Application number: 18/450,206
- Filed: 2023-08-15
- Published: 2023-11-30
- Granted: 2024-12-31
- Earliest claimed: 2019-01-25
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Hitoshi Fukui
- Web page: https://patentgrep.com/patent/US12183518B2

## CPC

- H01G 9/028: Organic semiconducting electrolytes, e.g. TCNQ
- 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

An electrolytic capacitor includes an anode body, a dielectric layer disposed on the anode body, and a solid electrolyte layer disposed on the dielectric layer. The solid electrolyte layer includes a first layer and a second layer disposed on the first layer. The first layer contains a first conductive polymer. And the second layer contains a second conductive polymer that is a self-doped conductive polymer.

## Claims

### Claim 1

An electrolytic capacitor comprising:
an anode body;
a dielectric layer disposed on the anode body; and
a solid electrolyte layer disposed on the dielectric layer, wherein:
the solid electrolyte layer includes a first layer including a first conductive polymer and a second conductive polymer, the first conductive polymer being a non-self-doped conductive polymer, the second conductive polymer being a self-doped conductive polymer,
the first layer has voids in which the first conductive polymer is absent, and
the second conductive polymer exists in at least part of the voids of the first layer.

### Claim 2 (depends on 1)

The electrolytic capacitor according to claim 1, wherein:
the solid electrolyte layer further includes the second layer covering the first layer, and
the second layer includes the second conductive polymer and excludes the first conductive polymer.

### Claim 3 (depends on 1)

The electrolytic capacitor according to claim 1, wherein:
the solid electrolyte layer further includes the second layer covering the first layer,
the second layer includes the second conductive polymer and the first conductive polymer, and
an amount of the second conductive polymer per unit volume of the second layer is greater than an amount of the second conductive polymer per unit volume of the first layer.

### Claim 4 (depends on 1)

The electrolytic capacitor according to claim 1, wherein:
the solid electrolyte layer further includes the second layer covering the first layer,
the second layer includes the second conductive polymer and the first conductive polymer, and
an amount of the second conductive polymer per unit volume of the second layer is greater than an amount of the first conductive polymer per unit volume of the second layer.

### Claim 5 (depends on 1)

The electrolytic capacitor according to claim 1, wherein:
the anode body has a porous part, and
at least part of the dielectric layer and at least part of the first layer are disposed in the porous part.

### Claim 6 (depends on 2)

The electrolytic capacitor according to claim 2, wherein:
the anode body has a porous part,
at least part of the dielectric layer and at least part of the first layer are disposed in the porous part, and
at least part of the second layer is disposed outside the porous part.

### Claim 7 (depends on 3)

The electrolytic capacitor according to claim 3, wherein:
the anode body has a porous part,
at least part of the dielectric layer and at least part of the first layer are disposed in the porous part, and
at least part of the second layer is disposed outside the porous part.

### Claim 8 (depends on 4)

The electrolytic capacitor according to claim 4, wherein:
the anode body has a porous part,
at least part of the dielectric layer and at least part of the first layer are disposed in the porous part, and
at least part of the second layer is disposed outside the porous part.

### Claim 9

A method for producing an electrolytic capacitor comprising:
preparing an anode body on which a dielectric layer is disposed; and
forming a solid electrolyte layer including a first conductive polymer and a second conductive polymer by adhering a liquid composition containing the second conductive polymer to a layer including the first conductive polymer after forming the layer including the first conductive polymer on the dielectric layer, the first conductive polymer being a non-self-doped conductive polymer, the second conductive polymer being a self-doped conductive polymer.

### Claim 10 (depends on 9)

The method according to claim 9, wherein the layer including the first conductive polymer is formed by chemical polymerization and/or electropolymerization of a precursor of the first conductive polymer.

### Claim 11 (depends on 9)

The method according to claim 9, wherein in the forming of the solid electrolyte layer, voids in which the first conductive polymer is absent are formed in the layer including the first conductive polymer so that the second conductive polymer exists in at least part of the voids.

### Claim 12 (depends on 10)

The method according to claim 10, wherein in the forming of the solid electrolyte layer, voids in which the first conductive polymer is absent are formed in the layer including the first conductive polymer so that the second conductive polymer exists in at least part of the voids.

### Claim 13 (depends on 11)

The method according to claim 11, wherein in the forming of the solid electrolyte layer, a first layer and a second layer are formed by adhering the liquid composition containing the second conductive polymer to the layer including the first conductive polymer, the first layer including the second conductive polymer and the first conductive polymer, the second layer including the second conductive polymer and excluding the first conductive polymer.

### Claim 14 (depends on 12)

The method according to claim 12, wherein in the forming of the solid electrolyte layer, a first layer and a second layer are formed by adhering the liquid composition containing the second conductive polymer to the layer including the first conductive polymer, the first layer including the second conductive polymer and the first conductive polymer, the second layer including the second conductive polymer and excluding the first conductive polymer.

### Claim 15 (depends on 11)

The method according to claim 11, wherein:
in the forming of the solid electrolyte layer, a first layer and a second layer are formed by adhering the liquid composition containing the second conductive polymer to the layer including the first conductive polymer, the first layer including the second conductive polymer and the first conductive polymer, the second layer including the first conductive polymer and the second conductive polymer, and
an amount of the second conductive polymer per unit volume of the second layer is greater than an amount of the second conductive polymer per unit volume of the first layer.

### Claim 16 (depends on 12)

The method according to claim 12, wherein:
in the forming of the solid electrolyte layer, a first layer and a second layer are formed by adhering the liquid composition containing the second conductive polymer to the layer including the first conductive polymer, the first layer including the second conductive polymer and the first conductive polymer, the second layer including the first conductive polymer and the second conductive polymer, and
an amount of the second conductive polymer per unit volume of the second layer is greater than an amount of the second conductive polymer per unit volume of the first layer.

### Claim 17 (depends on 11)

The method according to claim 11, wherein:
in the forming of the solid electrolyte layer, a first layer and a second layer are formed by adhering the liquid composition containing the second conductive polymer to the layer including the first conductive polymer, the first layer including the second conductive polymer and the first conductive polymer, the second layer including the first conductive polymer and the second conductive polymer, and
an amount of the second conductive polymer per unit volume of the second layer is greater than an amount of the first conductive polymer per unit volume of the second layer.

### Claim 18 (depends on 12)

The method according to claim 12, wherein:
in the forming of the solid electrolyte layer, a first layer and a second layer are formed by adhering the liquid composition containing the second conductive polymer to the layer including the first conductive polymer, the first layer including the second conductive polymer and the first conductive polymer, the second layer including the first conductive polymer and the second conductive polymer, and
an amount of the second conductive polymer per unit volume of the second layer is greater than an amount of the first conductive polymer per unit volume of the second layer.

### Claim 19 (depends on 11)

The method according to claim 11, wherein:
particles of the second conductive polymer are dispersed in the liquid composition, and
an average particle size of the particles is equal to or less than 800 nm.

### Claim 20 (depends on 12)

The method according to claim 12, wherein:
particles of the second conductive polymer are dispersed in the liquid composition, and
an average particle size of the particles is equal to or less than 800 nm.