# US 12,763,264 B2 · Solid electrolytic capacitor element and solid electrolytic capacitor

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- Number: US 12,763,264 B2
- Document ID: US12763264B2
- Status: Granted
- Kind: B2
- Application number: 18/833,094
- Filed: 2023-01-20
- Published: 2025-04-10
- Granted: 2026-10-13
- Earliest claimed: 2022-01-28
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Masatoshi Takeshita; Mayumi Maenishi
- Web page: https://patentgrep.com/patent/US12763264B2

## CPC

- H01G 9/025: Solid electrolytes (H01G11/54 takes precedence)
- H01G 9/055: Etched foil electrodes
- 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 element included in a solid electrolytic capacitor includes an anode foil that contains element Al and includes a porous part at least in a surface layer of the anode foil, a dielectric layer that covers at least a portion of a surface of the anode foil, and a solid electrolyte that covers at least a portion of the dielectric layer. The solid electrolyte contains element S, and the solid electrolyte has a first part filled in voids in the porous part in the anode foil having the dielectric layer and a second part that protrudes from the main surface of the anode foil having the dielectric layer. In elemental mapping of a cross section of the porous part using an electron probe microanalyzer, the presence ratio of the element S is 0.5% or more when the presence ratio of the element Al is taken as 100%.

## Claims

### Claim 1

A solid electrolytic capacitor element comprising:
an anode foil that contains aluminum element and includes a porous part at least in a surface layer of the anode foil;
a dielectric layer that covers at least a portion of a surface of the anode foil; and
a solid electrolyte that covers at least a portion of the dielectric layer,
wherein the solid electrolyte contains sulfur element, and the solid electrolyte has a first part filled in voids in the porous part in the anode foil having the dielectric layer and a second part that protrudes from a main surface of the anode foil having the dielectric layer,
the first part contains a first polymer component corresponding to a conjugated polymer and a second polymer component corresponding to a polymer anion containing the sulfur element,
the first polymer component contains the sulfur element,
the conjugated polymer contains at least a monomer unit corresponding to 3,4-ethylenedioxythiophene,
a weight average molecular weight of the polymer anion is 10000 or more, and
in elemental mapping of a cross section of the porous part using an electron probe microanalyzer, a presence ratio of the sulfur element is 0.5% or more when a presence ratio of the aluminum element is taken as 100%.

### Claim 2 (depends on 1)

The solid electrolytic capacitor element according to claim 1, wherein in a Raman spectrum of the first part, a ratio Ip1/Ip2 of an intensity Ip1 of a first peak specific to the first polymer component to an intensity Ip2 of a second peak specific to the second polymer component is 2 or more.

### Claim 3 (depends on 2)

The solid electrolytic capacitor element according to claim 2, wherein the ratio Ip1/Ip2 is 7 or less.

### Claim 4 (depends on 1)

The solid electrolytic capacitor element according to claim 1,
wherein in the first part, the polymer anion contains a monomer unit corresponding to an aromatic sulfonic acid compound,
in a Raman spectrum of the first part,
a first peak specific to the first polymer component is observed in a range of 1200 cm−1 or more and 1600 cm−1 or less, and
a second peak specific to the second polymer component is observed in a range of 800 cm−1 or more and 1100 cm−1 or less.

### Claim 5 (depends on 1)

The solid electrolytic capacitor element according to claim 1, wherein a weight average molecular weight of the polymer anion is 500,000 or less.

### Claim 6 (depends on 1)

A solid electrolytic capacitor comprising at least one solid electrolytic capacitor element according to claim 1.

### Claim 7 (depends on 6)

The solid electrolytic capacitor according to claim 6, wherein the solid electrolytic capacitor is a stacked-type capacitor, wherein the at least one solid electrolytic capacitor element is a plurality of the solid electrolytic capacitor elements stacked together.

### Claim 8 (depends on 6)

The solid electrolytic capacitor according to claim 6, wherein the solid electrolytic capacitor is a chip-type capacitor.

### Claim 9 (depends on 6)

The solid electrolytic capacitor according to claim 6, wherein the solid electrolytic capacitor is a wound-type capacitor.

### Claim 10 (depends on 9)

The solid electrolytic capacitor according to claim 9, wherein the at least one solid electrolytic capacitor element comprises two or more wound-type capacitor elements.

### Claim 11 (depends on 1)

The solid electrolytic capacitor element according to claim 1, wherein the presence ratio of the sulfur element is 0.65% or more.

### Claim 12 (depends on 1)

The solid electrolytic capacitor element according to claim 1, wherein the presence ratio of the sulfur element is 0.7% or more.

### Claim 13 (depends on 1)

The solid electrolytic capacitor element according to claim 1, wherein the presence ratio of the sulfur element is 0.78% or more.

### Claim 14 (depends on 2)

The solid electrolytic capacitor element according to claim 2, wherein the ratio Ip1/Ip2 is 5.5 or more.