# US 2025/0096296 A1 · Flow battery cell and metal-air flow battery

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- Number: US 2025/0096296 A1
- Document ID: US20250096296A1
- Status: Published application
- Kind: A1
- Application number: 18/794,223
- Filed: 2024-08-05
- Published: 2025-03-20
- Earliest claimed: 2023-09-15
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: Hirotaka MIZUHATA; Tomo KITAGAWA
- Web page: https://patentgrep.com/patent/US20250096296A1

## CPC

- H01M 8/188: {by recharging of redox couples containing fluids; Redox flow type batteries}
- H01M 8/225: {Fuel cells in which the fuel is based on materials comprising particulate active material in the form of a suspension, a dispersion, a fluidised bed or a paste}
- H01M 12/06: with one metallic and one gaseous electrode
- H01M 12/08: composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type
- Y02E 60/10: Energy storage using batteries
- 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 flow battery cell includes: a positive electrode chamber; a negative electrode chamber opposite the positive electrode chamber; and a separator configured to separate the positive electrode chamber and the negative electrode chamber, wherein the negative electrode chamber includes: a negative-electrode flow path configured to distribute a slurry containing a metal active material and an electrolytic solution; and a negative electrode constituting a part of a wall face of the negative-electrode flow path, the negative electrode is disposed along a direction intersecting with a gravity direction and below the separator in terms of the gravity direction, and the metal active material is distributed in a sliding flow state in the negative-electrode flow path.

## Claims

### Claim 1

A flow battery cell comprising:
a positive electrode chamber;
a negative electrode chamber opposite the positive electrode chamber; and
a separator configured to separate the positive electrode chamber and the negative electrode chamber, wherein
the negative electrode chamber comprises:
a negative-electrode flow path configured to distribute a slurry containing a metal active material and an electrolytic solution; and
a negative electrode constituting a part of a wall face of the negative-electrode flow path, and
the negative electrode is disposed along a direction intersecting with a gravity direction and below the separator in terms of the gravity direction and satisfies 5×10{circumflex over ( )}−9≤Dp{circumflex over ( )}2/η<2.5×10{circumflex over ( )}−7, where the slurry has a viscosity given by n Pas, and the metal active material has a particle diameter given by Dp m.

### Claim 2 (depends on 1)

The flow battery cell according to claim 1, wherein the metal active material is distributed in a sliding flow state in the negative-electrode flow path.

### Claim 3 (depends on 1)

The flow battery cell according to claim 1, wherein the viscosity of the slurry is less than 1,000 m·Pa.

### Claim 4 (depends on 1)

The flow battery cell according to claim 1, wherein the slurry contains the metal active material in a ratio of from 15 wt % to 30 wt %, both inclusive, relative to a total quantity.

### Claim 5 (depends on 1)

The flow battery cell according to claim 1, wherein the slurry exhibits a shear thinning property.

### Claim 6 (depends on 1)

The flow battery cell according to claim 1, wherein
the slurry contains a thickening agent, and
the thickening agent is a polymer material containing at least one species of site selected from acrylic acid, carboxy methyl cellulosic glucopyranose, β-D-mannuronic acid, α-L-guluronic acid, and acrylic methacrylate.

### Claim 7 (depends on 1)

The flow battery cell according to claim 1, wherein the slurry, upon passing through a cross-section of the negative-electrode flow path that is perpendicular to a distribution direction of the slurry, has a flow rate of from 75 cm/min to 500 cm/min, both inclusive, per unit flow-path cross-sectional area of the cross-section.

### Claim 8 (depends on 1)

The flow battery cell according to claim 1, wherein
the negative electrode constituting the wall face of the negative-electrode flow path and the separator opposite the negative electrode are separated by a distance h of from 1 mm to 6 mm, both inclusive, and
the negative-electrode flow path has a constant flow path width W perpendicular to the distance h.

### Claim 9 (depends on 1)

The flow battery cell according to claim 1, wherein the negative-electrode flow path includes no branching flow path between an inlet port and an outlet port for the slurry.

### Claim 10 (depends on 1)

A metal-air flow battery comprising:
a power generation unit including the flow battery cell according to claim 1;
a storage unit configured to contain the electrolytic solution distributed in the power generation unit; and
a charge unit to which the electrolytic solution is fed from the storage unit.