# US 11,309,564 B2 · Method for manufacturing reinforced separator, reinforced separator manufactured using the same and redox flow battery

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- Number: US 11,309,564 B2
- Document ID: US11309564B2
- Status: Granted
- Kind: B2
- Application number: 16/489,665
- Filed: 2019-01-08
- Published: 2020-04-16
- Granted: 2022-04-19
- Earliest claimed: 2018-01-10
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Sungyeon Kim; Tae Geun Noh; Sikwon Moon
- Web page: https://patentgrep.com/patent/US11309564B2

## CPC

- H01M 8/0239: Organic resins; Organic polymers
- H01M 8/1044: Mixtures of polymers, of which at least one is ionically conductive
- H01M 8/1058: characterised by a porous support having no ion-conducting properties
- H01M 8/1069: characterised by the manufacturing processes
- H01M 8/1086: After-treatment of the membrane other than by polymerisation
- H01M 8/18: Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
- H01M 8/188: {by recharging of redox couples containing fluids; Redox flow type batteries}
- Y02E 60/10: Energy storage using batteries
- Y02E 60/50: Fuel cells
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- 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
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A method for manufacturing a reinforced separator including pretreating a porous support using a first solution including a first ionic polymer and ethanol; and impregnating a second solution including a second ionic polymer and a solvent into the pretreated porous support, wherein a concentration of the first ionic polymer in the first solution is lower than a concentration of the second ionic polymer in the second solution, a reinforced separator manufactured using the same, and a redox flow battery.

## Claims

### Claim 1

A method for manufacturing a reinforced separator comprising:
pretreating a porous support with a first solution comprising a first ionic polymer and ethanol to form a pretreated porous support; and
impregnating a second solution comprising a second ionic polymer and a solvent into the pretreated porous support,
wherein a concentration of the first ionic polymer in the first solution is lower than a concentration of the second ionic polymer in the second solution.

### Claim 2 (depends on 1)

The method for manufacturing the reinforced separator of claim 1, wherein a content of the first ionic polymer of the first solution is from 1% by weight to 5% by weight with respect to a total weight of the first solution, and a content of the second ionic polymer of the second solution is from 10% by weight to 40% by weight with respect to a total weight of the second solution.

### Claim 3 (depends on 1)

The method for manufacturing the reinforced separator of claim 1, wherein a difference between a percent concentration of the first ionic polymer of the first solution and a percent concentration of the second ionic polymer of the second solution is from 5% by weight to 39% by weight.

### Claim 4 (depends on 1)

The method for manufacturing the reinforced separator of claim 1, wherein the first ionic polymer included in the first solution is in a powder state.

### Claim 5 (depends on 1)

The method for manufacturing the reinforced separator of claim 1, wherein the pretreating is performed by spraying the first solution on the porous support or dipping the porous support into the first solution.

### Claim 6 (depends on 1)

The method for manufacturing the reinforced separator of claim 1, wherein the impregnating of the second solution is performed by dipping the pretreated porous support into the second solution.

### Claim 7 (depends on 1)

The method for manufacturing the reinforced separator of claim 1, wherein the solvent included in the second solution is a hydrophilic solvent.

### Claim 8 (depends on 1)

The method for manufacturing the reinforced separator of claim 1, wherein the first and second ionic polymers are independently a fluorine-based polymer, a hydrocarbon-based polymer or a partial fluorine-based polymer.

### Claim 9 (depends on 1)

The method for manufacturing the reinforced separator of claim 1, wherein the first ionic polymer included in the first solution and the second ionic polymer included in the second solution are the same as each other or different from each other.

### Claim 10 (depends on 1)

The method for manufacturing the reinforced separator of claim 1, further comprising:
after the impregnating of the second solution into the pretreated porous support, drying the pretreated porous support.