# US 12,183,519 B2 · Electrolytic capacitor and production method therefor

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

- Number: US 12,183,519 B2
- Document ID: US12183519B2
- Status: Granted
- Kind: B2
- Application number: 17/929,722
- Filed: 2022-09-05
- Published: 2022-12-29
- Granted: 2024-12-31
- Earliest claimed: 2020-03-31
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Yoshiaki Ishimaru; Takayuki Matsumoto; Tatsuji Aoyama
- Web page: https://patentgrep.com/patent/US12183519B2

## CPC

- H01G 9/035: Liquid electrolytes, e.g. impregnating materials (H01G11/54 takes precedence)
- H01G 9/0036: {Formation of the solid electrolyte layer}
- H01G 9/025: Solid electrolytes (H01G11/54 takes precedence)
- H01G 9/028: Organic semiconducting electrolytes, e.g. TCNQ
- H01G 9/151: {with wound foil electrodes}
- 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 method for producing an electrolytic capacitor, the electrolytic capacitor including a capacitor element including an anode body and a cathode body each having a foil shape. The anode body includes a dielectric layer on a surface of the anode body. The method includes a step of forming a capacitor element precursor by winding or stacking a separator, the anode body, and the cathode body with the separator interposed between the anode body and the cathode body, a step of impregnating the capacitor element precursor with a treatment liquid containing an acid component, a solvent, and a conductive polymer component, a step of impregnating the capacitor element precursor with a liquid component after the step of impregnating the capacitor element precursor with the treatment liquid, and a step of forming the capacitor element by eluting the acid component into the liquid component.

## Claims

### Claim 1

A method for producing an electrolytic capacitor, the electrolytic capacitor including a capacitor element including an anode body and a cathode body each having a foil shape, the anode body including a dielectric layer on a surface of the anode body, the method comprising:
forming a capacitor element precursor by winding or stacking a separator, the anode body, the cathode body with the separator interposed between the anode body and the cathode body;
impregnating the capacitor element precursor with a treatment liquid containing an acid component, a solvent, and a conductive polymer component;
impregnating the capacitor element precursor with a liquid component after the impregnating of the capacitor element precursor with the treatment liquid; and
forming the capacitor element by eluting the acid component into the liquid component.

### Claim 2 (depends on 1)

The method according to claim 1, wherein a content proportion of the acid component in a total amount of the liquid component ranges from 0.01 mass % to 2 mass %, inclusive, after the forming of the capacitor element.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the acid component contains a compound containing at least one functional group selected from the group consisting of a carboxy group, a hydroxy group, a sulfo group, a phosphoric acid group, a nitro group, and an oxo group.

### Claim 4 (depends on 1)

The method according to claim 1, wherein in the impregnating of the capacitor element precursor with the liquid component, an electric conductivity X1 of the liquid component is less than or equal to 1 μS/cm.

### Claim 5 (depends on 1)

The method according to claim 1, wherein after the forming of the capacitor element, an electric conductivity X2 of the liquid component from which the acid component has been eluted is higher than an electric conductivity X1 of the liquid component in the impregnating of the capacitor element precursor with the liquid component, the electric conductivity X2 being from 0.1 μS/cm to 500 μS/cm, inclusive.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the liquid component contains an aprotic solvent.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the liquid component contains a protic solvent.

### Claim 8 (depends on 1)

The method according to claim 1, wherein:
the liquid component after the forming of the capacitor element contains a base component, and
a content proportion of the base component in a total amount of the liquid component after the forming of the capacitor element is less than or equal to 2 mass %.

### Claim 9 (depends on 1)

The method according to claim 1, further comprising removing the solvent by drying after the impregnating of the capacitor element precursor with the treatment liquid and before the impregnating of the capacitor element precursor with the liquid component,
wherein a drying temperature in the removing of the solvent is higher than or equal to 150° C.