Electrolyte formulation
AssigneeV-Flow Tech Pte. Ltd.
InventorsDuy Tam Nguyen, Nyunt Wai Maung, Arjun Bhattarai
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Abstract
Provided herein is an electrolyte for a battery, the electrolyte comprising: a solvent comprising water and sulfuric acid; a vanadium salt; a deprotonation inhibitor for [VO2(H2O)3]+; and a V2O5 precipitation inhibitor. Provided also are batteries comprising the electrolyte, kits comprising components of the electrolyte, a method for stabilising vanadium salts in an electrolyte by adding a deprotonation inhibitor for [VO2(H2O)3]+; and a V2O5 precipitation inhibitor.
Claims43
An electrolyte for a battery, the electrolyte comprising:
- a solvent comprising water and sulfuric acid;
- a vanadium salt;
- a deprotonation inhibitor for [VO2(H2O)3]+;
- and
- a V2O5 precipitation inhibitor.
An electrolyte for a battery according to any one of the preceding claims, wherein the V2O5 precipitation inhibitor is an organic compound.
An electrolyte for a battery according to Statement 11, wherein the organic compound is selected from one or more of the group consisting of polyvinylpyrrolidone (PVP), and a water-soluble polyalkylene glycol,
- optionally wherein the organic compound is selected from one or more of polyvinylpyrrolidone and polyethylene glycol.
An electrolyte for a battery according to any one of the preceding claims, wherein the inorganic compound includes NH4H2PO4 and the organic compound includes PVP.
An electrolyte for a battery according to any one of the preceding claims, wherein the vanadium salt comprises a vanadium sulfate.
An electrolyte for a battery according to any one of the preceding claims, wherein the electrolyte comprises vanadium ions in a concentration of from 1.0 to 3.0 M.
An electrolyte for a battery according to any one of the preceding claims, wherein the electrolyte comprises sulphate ions in a concentration of from 2 to 6M.
An electrolyte for a battery, the electrolyte comprising:
- water,
- vanadium ions present in a concentration from 1.6 M to 2M;
- sulfate ions present in a concentration of from 4 M to 5M;
- and
- at least two additives, wherein
- the at least two additives prevent the precipitation of more than 150 mg of V2O5 per 2 mL of the electrolyte following heating of the electrolyte for 7 days at 50° C.
A kit of parts for stabilizing a vanadium electrolyte for use in a vanadium redox flow battery, the kit of parts comprising:
- (a) a first additive composition comprising a deprotonation inhibitor for [VO2(H2O)3]+;
- and
- (b) a second additive composition comprising a V2O5 precipitation inhibitor.
A method of stabilizing a vanadium electrolyte for use in a vanadium redox flow battery,
- the vanadium electrolyte comprising:
- a solvent comprising water and sulfuric acid, and
- a vanadium salt, the method comprising obtaining a stabilized electrolyte by:
- adding a deprotonation inhibitor for [VO2(H2O)3]+ and a V2O5 precipitation inhibitor to the vanadium electrolyte.
Dependencies are inferred from the claim text.