# US 11,309,567 B2 · Ion exchange membrane and flow battery including same

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- Number: US 11,309,567 B2
- Document ID: US11309567B2
- Status: Granted
- Kind: B2
- Application number: 16/623,104
- Filed: 2019-04-03
- Published: 2020-04-23
- Granted: 2022-04-19
- Earliest claimed: 2018-05-17
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Sikwon Moon; Sungyeon Kim; Tae Geun Noh
- Web page: https://patentgrep.com/patent/US11309567B2

## CPC

- H01M 8/188: {by recharging of redox couples containing fluids; Redox flow type batteries}
- H01M 8/1053: consisting of layers of polymers with at least one layer being ionically conductive
- H01M 8/1067: characterised by their physical properties, e.g. porosity, ionic conductivity or thickness
- H01M 8/20: Indirect fuel cells, e.g. fuel cells with redox couple being irreversible (H01M8/18 takes precedence)
- H01M 2008/1095: {Fuel cells with polymeric electrolytes}
- H01M 2300/0094: in the form of layered products, e.g. coatings
- 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

An ion exchange membrane including a first ion exchange resin layer with a first and a second surface; a second ion exchange resin layer on the first surface of the first ion exchange resin layer; and a third ion exchange resin layer on the second surface of the first ion exchange resin layer, wherein the second ion exchange resin layer and the third ion exchange resin layer each independently include an ionomer having a higher equivalent weight (EW) than an ionomer of the first ion exchange resin layer.

## Claims

### Claim 1

An ion exchange membrane comprising:
a first ion exchange resin layer having a first and a second surface;
a second ion exchange resin layer on the first surface of the first ion exchange resin layer;
a third ion exchange resin layer on the second surface of the first ion exchange resin layer;
a fourth ion exchange resin layer on a surface of the second ion exchange resin layer which is opposite to the surface in contact with the first surface of the first ion exchange resin layer; and
a fifth ion exchange resin layer on a surface of the third ion exchange resin layer which is opposite to the surface in contact with the second surface of the first ion exchange resin layer,
wherein the first, second, third, fourth and fifth ion exchange resin layers each independently comprise one or more ionomer, and
the one or more ionomer included in each of the second ion exchange resin layer and the third ion exchange resin layer has a higher equivalent weight (EW) than the one or more ionomer of the first ion exchange resin layer; and
the one or more ionomer included in each of the fourth ion exchange resin layer and the fifth ion exchange resin layer has a higher EW than the one or more ionomer of the second ion exchange resin layer and the third ion exchange resin layer.

### Claim 2 (depends on 1)

The ion exchange membrane of claim 1, wherein the first, second and third ion exchange resin layers each independently comprise one or more ionomer having an EW of greater than or equal to 500 g/mol and less than or equal to 1,100 g/mol.

### Claim 3 (depends on 1)

The ion exchange membrane of claim 1, wherein the first ion exchange resin layer comprises one or more ionomer having an EW of greater than or equal to 500 g/mol and less than or equal to 900 g/mol; and
the second ion exchange resin layer and the third ion exchange resin layer each independently comprise one or more ionomer having an EW of greater than 900 g/mol and less than or equal to 1,100 g/mol.

### Claim 4 (depends on 1)

The ion exchange membrane of claim 1, wherein the first, second and third ion exchange resin layers each have a thickness of greater than or equal to 5 μm and less than or equal to 30 μm.

### Claim 5 (depends on 1)

The ion exchange membrane of claim 1, wherein the first, second, third, fourth and fifth ion exchange resin layers each independently comprise one or more ionomer having an EW of greater than or equal to 500 g/mol and less than or equal to 1,100 g/mol.

### Claim 6 (depends on 1)

The ion exchange membrane of claim 1, wherein the first ion exchange resin layer comprises one or more ionomer having an EW of greater than or equal to 500 g/mol and less than or equal to 750 g/mol;
the second ion exchange resin layer and the third ion exchange resin layer each independently comprise one or more ionomer having an EW of greater than 750 g/mol and less than or equal to 900 g/mol; and
the fourth ion exchange resin layer and the fifth ion exchange resin layer each independently comprise one or more ionomer having an EW of greater than 900 g/mol and less than or equal to 1,100 g/mol.

### Claim 7 (depends on 1)

The ion exchange membrane of claim 1, wherein the first, second, third, fourth and fifth ion exchange resin layers each have a thickness of greater than or equal to 5 μm and less than or equal to 30 μm.

### Claim 8 (depends on 1)

The ion exchange membrane of claim 1, wherein the ion exchange membrane has a thickness of greater than or equal to 15 μm and less than or equal to 200 μm.

### Claim 9 (depends on 1)

A flow battery comprising:
a negative electrode;
a positive electrode; and
the ion exchange membrane of claim 1 provided between the negative electrode and the positive electrode.