Aqueous redox flow batteries comprising metal ligand coordination compounds

Patent metadata

Field	Value
Publication number	US-9991544-B2
Application number	US-201615167930-A
Country	US
Kind code	B2
Filing date	May 27, 2016
Priority date	Jul 27, 2012
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

This invention is directed to aqueous redox flow batteries comprising redox-active metal ligand coordination compounds. The compounds and configurations described herein enable flow batteries with performance and cost parameters that represent a significant improvement over that previous known in the art.

First claim

What is claimed is the following:

1. An aqueous solution comprising:
a metal complex containing at least one substituted catecholate ligand; and
a supporting electrolyte comprising an ammonium salt or a phosphonate salt.

2. The aqueous solution of claim 1 , wherein the ammonium salt comprises an alkylammonium salt or an arylammonium salt.

3. The aqueous solution of claim 1 , wherein the metal complex has a concentration of at least about 0.5M in the aqueous solution.

4. The aqueous solution of claim 1 , wherein the at least one substituted catecholate ligand comprises a sulfonated catecholate ligand.

5. The aqueous solution of claim 1 , wherein the at least one substituted catecholate ligand comprises a hydroxycatecholate ligand.

6. The aqueous solution of claim 1 , wherein the metal complex contains two unsubstituted catecholate ligands and one substituted catecholate ligand.

7. The aqueous solution of claim 1 , wherein the metal complex contains one unsubstituted catecholate ligand and two substituted catecholate ligands.

8. The aqueous solution of claim 1 , wherein the metal complex comprises a metal selected from the group consisting of Al, Ca, Ce, Co, Cr, Fe, Mg, Mo, Sn, Ti, U, W, Zn and Zr.

9. The aqueous solution of claim 8 , wherein the metal complex comprises Ti.

10. The aqueous solution of claim 1 , wherein the aqueous solution has a pH ranging between about 9 to about 13.

11. The aqueous solution of claim 1 , wherein the aqueous solution has a pH ranging between about 8 to about 12.

12. The aqueous solution of claim 1 , wherein the metal complex contains at least one unsubstituted catecholate ligand and at least one substituted catecholate ligand.

13. A flow battery comprising:
a first half-cell containing a first aqueous electrolyte solution; and
a second half-cell containing a second aqueous electrolyte solution;
wherein at least one of the first aqueous electrolyte solution and the second aqueous electrolyte solution comprises an aqueous solution comprising a metal complex containing at least one catecholate ligand, and a supporting electrolyte comprising an ammonium salt or a phosphonate salt.

14. The flow battery of claim 13 , wherein the ammonium salt comprises an alkylammonium salt or an arylammonium salt.

15. The flow battery of claim 13 , wherein the metal complex contains at least one unsubstituted catecholate ligand and at least one substituted catecholate ligand.

16. The flow battery of claim 15 , wherein the at least one substituted catecholate ligand comprises a sulfonated catecholate ligand.

17. The flow battery of claim 15 , wherein the at least one substituted catecholate ligand comprises a hydroxycatecholate ligand.

18. The flow battery of claim 15 , wherein the metal complex contains two unsubstituted catecholate ligands and one substituted catecholate ligand.

19. The flow battery of claim 15 , wherein the metal complex contains one unsubstituted catecholate ligand and two substituted catecholate ligands.

20. The flow battery of claim 13 , wherein the metal complex contains three unsubstituted catecholate ligands.

21. The flow battery of claim 13 , wherein the metal complex comprises Ti.

22. The flow battery of claim 13 , wherein the metal complex has a concentration of at least about 0.5M in the aqueous solution.

23. The flow battery of claim 13 , wherein the metal complex contains at least one unsubstituted catecholate ligand and at least one substituted catecholate ligand.

Assignees

• Lockheed Martin Advanced Energy Storage Llc

Inventors

• Goeltz John
• Amadeo Desiree
• Esswein Arthur J
• Jarvi Thomas D
• King Evan R
• Reece Steven Y
• Tyagi Nitin

Classifications

• H01M8/188 Primary

  by recharging of redox couples containing fluids; Redox flow type batteries · CPC title

• H01M8/20

  Indirect fuel cells, e.g. fuel cells with redox couple being irreversible (H01M8/18 takes precedence) · CPC title

• H02J7/00

  Circuit arrangements for charging or discharging batteries or for supplying loads from batteries · CPC title

• Y02E60/528

  Cross-Sectional Technologies · mapped topic

• H01M8/08

  Fuel cells with aqueous electrolytes · CPC title