# US 2014/0193687 A1 · Redox flow battery

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- Number: US 2014/0193687 A1
- Document ID: US20140193687A1
- Status: Published application
- Kind: A1
- Application number: 14/077,471
- Filed: 2013-11-12
- Published: 2014-07-10
- Earliest claimed: 2013-01-08
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Joung-won PARK; Duk-jin OH; Doo-yeon LEE; Myung-jin LEE
- Web page: https://patentgrep.com/patent/US20140193687A1

## CPC

- H01M 8/188: {by recharging of redox couples containing fluids; Redox flow type 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 redox flow battery including a cathode cell having a cathode and a catholyte solution; an anode cell having an anode and an anolyte solution; and an ion exchange membrane disposed between the cathode cell and the anode cell, wherein the catholyte solution and the anolyte solution each include an electrolyte, wherein the electrolyte includes a plurality of metal-ligand coordination compounds, wherein at least one of the metal-ligand coordination compounds includes two or more different ligands, and wherein a dipole moment of the metal-ligand coordination compound is greater than 0.

## Claims

### Claim 1

A redox flow battery comprising:
a cathode cell comprising
a cathode and
a catholyte solution;
an anode cell comprising
an anode and
an anolyte solution; and
an ion exchange membrane disposed between the cathode cell and the anode cell,
wherein the catholyte solution and the anolyte solution each comprises an electrolyte,
wherein the electrolyte comprises a plurality of metal-ligand coordination compounds,
wherein at least one of the metal-ligand coordination compounds comprises two or more different ligands, and
wherein a dipole moment of the metal-ligand coordination compound is greater than 0.

### Claim 2 (depends on 1)

The redox flow battery of claim 1, wherein
the metal-ligand coordination compound comprises at least one metal selected from nickel, cobalt, iron, ruthenium, zinc, manganese, yttrium, zirconium, titanium, chromium, magnesium, cerium, copper, lead, and vanadium.

### Claim 3 (depends on 1)

The redox flow battery of claim 1, wherein
the metal-ligand coordination compound comprises a nitrogen atom-containing heteroaromatic ligand, a nitrogen atom-containing heteroaliphatic ligand, or a combination thereof.

### Claim 4 (depends on 3)

The redox flow battery of claim 3, wherein
the nitrogen atom-containing heteroaromatic ligand or the nitrogen atom-containing heteroaliphatic ligand comprises at least one selected from a substituted or unsubstituted dipyridyl, a substituted or unsubstituted terpyridyl, a substituted or unsubstituted phenanthroline, a substituted or unsubstituted ethylenediamine, a substituted or unsubstituted propylenediamine, and a substituted or a unsubstituted N-heterocyclic carbene.

### Claim 5 (depends on 4)

The redox flow battery of claim 4, wherein
the a substituted or unsubstituted N-heterocyclic carbene is at least one selected from 2,6-bis(methylimidazole-2-ylidene)pyridine, 1,3-dimesitylimidazole, 1,3-bis(2,5-diisopropylphenyl)imidazole, 1,3-dimethylimidazole, 1,3-di-tert-butylimidazole, 1,3-dicyclohexylimidazole, and 1-ethyl-3-methylimidazole.

### Claim 6 (depends on 4)

The redox flow battery of claim 4, wherein
each of the substituted dipyridyl, the substituted terpyridyl, the substituted phenanthroline, the substituted ethylenediamine, the substituted propylenediamine, and the substituted N-heterocyclic carbene comprises at least one group selected from a C1 to C6 alkyl group, a halogen atom, a C5 to C8 alkylphenyl group, and a nitro group.

### Claim 7 (depends on 1)

The redox flow battery of claim 1, wherein
the metal-ligand coordination compound is one of the following compounds:

### Claim 8 (depends on 1)

The redox flow battery of claim 1, wherein the metal-ligand coordination compound undergoes a reversible oxidation and reduction reaction.

### Claim 9 (depends on 1)

The redox flow battery of claim 1, wherein the ion exchange membrane is an anion exchange membrane.

### Claim 10 (depends on 1)

The redox flow battery of claim 1, further comprising a catholyte tank and an anolyte tank, wherein the catholyte tank and the anolyte tank respectively is each in fluid communicated with the cathode cell and the anode cell.