Aqueous redox flow batteries featuring improved cell design characteristics

Patent metadata

Field	Value
Publication number	US-10056639-B2
Application number	US-201615162470-A
Country	US
Kind code	B2
Filing date	May 23, 2016
Priority date	Jul 27, 2012
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

Provided are compositions having the formula MnTi(L1)(L2)(L3) wherein L1 is a catecholate, and L2 and L3 are each independently selected from catecholates, ascorbate, citrate, glycolates, a polyol, gluconate, glycinate, hydroxyalkanoates, acetate, formate, benzoates, malate, maleate, phthalates, sarcosinate, salicylate, oxalate, a urea, polyamine, aminophenolates, acetylacetone or lactate; each M is independently Na, Li, or K; n is 0 or an integer from 1-6. Also provided are energy storage systems.

First claim

What is claimed is the following:

1. A composition comprising:
a titanium complex containing at least one unsubstituted catecholate ligand and at least one substituted catecholate, wherein at least one of the substituted catecholate ligands is a sulfonated catecholate ligand; and
sodium and potassium counterions.

2. The composition of claim 1 , wherein the titanium complex contains a hydroxycatecholate ligand.

3. The composition of claim 1 , wherein the titanium complex contains two unsubstituted catecholate ligands and the one sulfonated catecholate ligand.

4. The composition of claim 1 , wherein the titanium complex contains one unsubstituted catecholate ligand, one sulfonated catecholate ligand, and at least one ligand selected from the group consisting of, ascorbate, citrate, glycolate, a polyol, gluconate, glycinate, a hydroxyalkanoate, acetate, formate, benzoate, malate, maleate, phthalate, sarcosinate, salicylate, oxalate, a urea, a polyamine, an aminophenolate, acetylacetonate, and lactate.

5. The composition of claim 1 , wherein the sodium and potassium counterions are present in substantially equal molar amounts.

6. An aqueous solution comprising the composition of claim 1 .

7. The aqueous solution of claim 6 , wherein the titanium complex has a concentration of at least about 0.5 M in the aqueous solution.

8. The aqueous solution of claim 6 , wherein the titanium complex contains a hydroxycatecholate ligand.

9. The aqueous solution of claim 6 , wherein the titanium complex contains two unsubstituted catecholate ligands and one sulfonated catecholate ligand.

10. The aqueous solution of claim 6 , wherein the titanium complex contains one unsubstituted catecholate ligand, one sulfonated catecholate ligand, and at least-one ligand selected from the group consisting of ascorbate, citrate, glycolate, a polyol, gluconate, glycinate, a hydroxyalkanoate, acetate, formate, benzoate, malate, maleate, phthalate, sarcosinate, salicylate, oxalate, a urea, a polyamine, an aminophenolate, acetylacetonate, and lactate.

11. The aqueous solution of claim 6 , wherein substantially equal molar quantities of the sodium and potassium counterions are present.

12. A flow battery comprising:
a first half-cell containing a first electrolyte solution; and
a second half-cell containing a second electrolyte solution;
wherein at least one of the first electrolyte solution and the second electrolyte solution comprises the aqueous solution of claim 6 .

Assignees

• Lockheed Martin Advanced Energy Storage Llc
• Lockheed Martin Energy Llc

Inventors

• Esswein Arthur J
• Reece Steven Y
• King Evan R
• Goeltz John
• Amadeo Desiree D

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

• H01M4/9008

  Organic or organo-metallic compounds · CPC title

• C07F7/28

  Titanium compounds · CPC title

• Y02E60/528

  Cross-Sectional Technologies · mapped topic