# US 2025/0157745 A1 · Electrode and electrolytic capacitor comprising the electrode

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- Number: US 2025/0157745 A1
- Document ID: US20250157745A1
- Status: Published application
- Kind: A1
- Application number: 18/730,639
- Filed: 2023-01-18
- Published: 2025-05-15
- Earliest claimed: 2022-01-24
- Applicants: TDK Electronics AG
- Inventors: László Dobai; Cristiano Bacco; Sudipta Sarkar
- Web page: https://patentgrep.com/patent/US20250157745A1

## CPC

- H01G 9/045: based on aluminium
- H01G 9/0029: {Processes of manufacture}
- H01G 9/02: Diaphragms; Separators
- H01G 9/0425: {specially adapted for cathode}
- H01G 9/048: characterised by their structure (H01G11/22 takes precedence)
- H01G 9/055: Etched foil electrodes
- 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

In an embodiment an electrode for an electrolytic capacitor includes a carrier substrate and a first metallization created on a first side of the carrier substrate.

## Claims

### Claim at position 1

-20. (canceled)

### Claim 21

An electrode for an electrolytic capacitor comprising:
a carrier substrate; and
a first metallization created on a first side of the carrier substrate.

### Claim 22 (depends on 21)

The electrode according to claim 21, wherein the carrier substrate has a higher tensile strength than the metallization.

### Claim 23 (depends on 21)

The electrode according claim 21, wherein the carrier substrate has a second metallization created on a second side of the carrier substrate.

### Claim 24 (depends on 23)

The electrode according to claim 23, wherein the carrier substrate comprises a polymer material.

### Claim 25 (depends on 21)

The electrode according claim 21, wherein the carrier substrate is capable of at least partly an electrolyte or electrolyte retaining separator for the electrolytic capacitor, and wherein a second side of the carrier substrate is free of a metallization.

### Claim 26 (depends on 25)

The electrode according claim 25, wherein the carrier substrate is capable of being penetrated or soaked by an electrolyte of the electrolytic capacitor.

### Claim 27 (depends on 25)

The electrode according to claim 25, wherein the carrier substrate is porous.

### Claim 28 (depends on 25)

The electrode according to claim 25, wherein the carrier substrate is a fibrous carrier substrate.

### Claim 29 (depends on 28)

The electrode according to claim 28, wherein the carrier substrate comprises cellulose fibers.

### Claim 30 (depends on 21)

The electrode according to claim 21, wherein the carrier substrate has a thickness of below 15 μm and the metallization has a thickness of 0.01 to 1 μm.

### Claim 31 (depends on 21)

The electrode according to claim 21, wherein the metallization is surface enhanced, and wherein a specific capacitance of at least 5 μF/cm2 is provided.

### Claim 32 (depends on 21)

The electrode according to claim 21, wherein the carrier substrate provides a tensile strength of at least 10 N/cm to the electrode.

### Claim 33 (depends on 21)

The electrode according to claim 21, wherein the metallization comprises multiple layers.

### Claim 34 (depends on 33)

The electrode according to claim 33, wherein the layers of the metallization are ribbons and the layers are arranged such that a net-like pattern is created by the ribbons.

### Claim 35 (depends on 25)

A wound electrolytic capacitor comprising:
an anode;
a cathode being the electrode according to claim 25; and
a first separator,
wherein the first separator is arranged between the metallized first side of the carrier substrate and the side of the anode facing the metallized first side of the carrier substrate, and
wherein the first separator and the carrier substrate are soaked by the electrolyte.

### Claim 36 (depends on 35)

The wound electrolytic capacitor according to claim 35, wherein an interspace created by the second side of the carrier substrate and the side of the anode facing the second side of the carrier substrate is free from an additional separator.

### Claim 37 (depends on 35)

The wound electrolytic capacitor according to claim 35, further comprising a second separator arranged between the second side of the carrier substrate and a side of the anode facing the second side of the carrier substrate.

### Claim 38 (depends on 23)

A wound electrolytic capacitor comprising:
an anode;
a cathode being the electrode according to claim 23; and
two separators,
wherein the two separators are arranged between both metalized sides of the cathode and the sides of the anode facing these sides of the cathode.

### Claim 39 (depends on 38)

The wound electrolytic capacitor according to claim 38, wherein at least part of the cathode extends the anode towards one side surface of a capacitor coil, and wherein the extended parts of the cathode have a metal cover, which covers at least part of this side surface, allowing for external contacting.

### Claim 40

A method for forming an electrode for a wound electrolytic capacitor in a roll-to-roll process, the method comprising:
continuously unwinding a carrier substrate from a first role;
continuously applying a metallization to at least a part of a first side of the carrier substrate; and
continuously winding metallized parts of the carrier substrate onto a second role.