# US 11,309,565 B2 · Electrode structure and redox flow battery comprising same

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

- Number: US 11,309,565 B2
- Document ID: US11309565B2
- Status: Granted
- Kind: B2
- Application number: 16/348,363
- Filed: 2018-02-26
- Published: 2019-08-22
- Granted: 2022-04-19
- Earliest claimed: 2017-02-28
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Jeongbae Lee; Tae Geun Noh; Sujin Byun; Joon Ho Park; Sikwon Moon; Sungyeon Kim
- Web page: https://patentgrep.com/patent/US11309565B2

## CPC

- H01M 8/18: Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
- H01M 4/86: Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M 4/8605: {Porous electrodes}
- H01M 4/8631: {Bipolar electrodes}
- H01M 8/0234: Carbonaceous material
- H01M 8/0245: in the form of layered or coated products
- H01M 8/0247: characterised by the form (characterised by a channel configuration H01M8/0258)
- H01M 8/0271: Sealing or supporting means around electrodes, matrices or membranes
- H01M 8/20: Indirect fuel cells, e.g. fuel cells with redox couple being irreversible (H01M8/18 takes precedence)
- Y02E 60/50: Fuel cells
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A redox flow battery including an electrode assembly, the electrode assembly including a carbon block having pores and a flow frame having a first and a second surface, wherein the carbon block is accommodated on one or both of the first and second surfaces.

## Claims

### Claim 1

An electrode structure comprising:
a carbon block having pores; and
a flow frame having the carbon block accommodated on one surface or both surfaces,
wherein the carbon block has porosity of greater than or equal to 5% and less than or equal to 70%, and the carbon block has compressive strength of 20 MPa or greater, and
wherein the carbon block has sintered density of 0.6 g/cm3 or greater.

### Claim 2 (depends on 1)

The electrode structure of claim 1, wherein the flow frame is provided with a carbon block accommodating groove accommodating the carbon blocks, and
wherein a thickness of the carbon block is smaller than a depth of the carbon block accommodating groove.

### Claim 3 (depends on 1)

The electrode structure of claim 1, further comprising an interfacial resistance reducing layer comprising any one selected from among carbon paper, carbon cloth and thin carbon felt provided on at least one surface of the carbon block.

### Claim 4 (depends on 1)

The electrode structure of claim 1, wherein the flow frame is provided with a carbon block accommodating hole perforated in a thickness direction.

### Claim 5 (depends on 4)

The electrode structure of claim 4, further comprising a graphite plate provided on one surface of the carbon block,
wherein the carbon block provided with the graphite plate on the one surface is inserted to the carbon block accommodating hole of the flow frame.

### Claim 6 (depends on 1)

A redox flow battery comprising:
a first end plate;
a first monopolar plate;
a first battery separator;
a second battery separator;
a second monopolar plate; and
a second end plate,
wherein the first end plate, the first monopolar plate, the separator, the second monopolar plate, and the second end plate are provided in consecutive order,
wherein at least one of the first and the second monopolar plates is the electrode structure of claim 1.

### Claim 7 (depends on 6)

The redox flow battery of claim 6, further comprising one or more bipolar plates between the first battery separator and the second battery separator,
wherein at least one of the one or more bipolar plates is the electrode structure.

### Claim 8 (depends on 1)

The electrode structure of claim 1, wherein the carbon block is comprised of a phenol resin.

### Claim 9

A redox flow battery comprising:
a first end plate;
a first monopolar plate;
a first separator;
a second separator;
one or more bipolar plates between the first separator and the second separator;
a second monopolar plate; and
a second end plate,
wherein each of the bipolar plates is an electrode structure comprising:
a carbon block having pores; and
a flow frame having the carbon block accommodated on one surface or both surfaces,
wherein the carbon block has porosity of greater than or equal to 5% and less than or equal to 70%, and the carbon block has compressive strength of 20 MPa or greater, and
wherein the carbon block has sintered density of 0.6 g/cm3 or greater.

### Claim 10 (depends on 9)

The redox flow battery of claim 9, wherein the flow frame is provided with a carbon block accommodating groove accommodating the carbon blocks, and
wherein a thickness of the carbon block is smaller than a depth of the carbon block accommodating groove.

### Claim 11 (depends on 9)

The redox flow battery of claim 9, further comprising an interfacial resistance reducing layer comprising any one selected from among carbon paper, carbon cloth and thin carbon felt provided on at least one surface of the carbon block.

### Claim 12 (depends on 9)

The redox flow battery of claim 9, wherein the flow frame is provided with a carbon block accommodating hole perforated in a thickness direction.

### Claim 13 (depends on 12)

The redox flow battery of claim 12, further comprising a graphite plate provided on one surface of the carbon block,
wherein the carbon block provided with the graphite plate on the one surface is inserted to the carbon block accommodating hole of the flow frame.

### Claim 14 (depends on 9)

The redox flow battery of claim 9, wherein the first end plate includes a protrusion extending from a first surface of the first end plate facing the second end plate,
wherein the second end plate includes a protrusion, and
wherein the protrusion of the second end plate accommodates the protrusion of the first end plate.

### Claim 15 (depends on 9)

The redox flow battery of claim 9, wherein the carbon block is comprised of a phenol resin.