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US 10,374,248 B2Granted
High solubility iron hexacyanides
AssigneeLockheed Martin Energy, LLC
InventorsArthur J. Esswein, John Goeltz, Desiree Amadeo
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Abstract
Stable solutions comprising high concentrations of charged coordination complexes, including iron hexacyanides are described, as are methods of preparing and using same in chemical energy storage systems, including flow battery systems. The use of these compositions allows energy storage densities at levels unavailable by other iron hexacyanide systems.
Claims7
A method comprising:
- dissolving Ca2[Fe(CN)6], NaOH and KOH in water, to produce an aqueous solution having a concentration of Fe(CN)64− in the aqueous solution that exceeds a concentration of Fe(CN)64− in either a saturated aqueous solution of Na4[Fe(CN)6] or a saturated aqueous solution of K4[Fe(CN)6] in water at a same temperature as that of the aqueous solution,
- wherein the aqueous solution is interconvertible between a ferricyanide state and a ferrocyanide state without forming a precipitate in either state.
Dependencies are inferred from the claim text.