High solubility iron hexacyanides
US-2016276692-A1 · Sep 22, 2016 · US
High solubility iron hexacyanides
US10374248B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10374248-B2 |
| Application number | US-201715647190-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 11, 2017 |
| Priority date | Aug 15, 2012 |
| Publication date | Aug 6, 2019 |
| Grant date | Aug 6, 2019 |
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- Title
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Abstract
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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.
First claim
Opening claim text (preview).
What is claimed is the following: 1. A method comprising: dissolving Ca 2 [Fe(CN) 6 ], NaOH and KOH in water, to produce an aqueous solution having a concentration of Fe(CN) 6 4− in the aqueous solution that exceeds a concentration of Fe(CN) 6 4− in either a saturated aqueous solution of Na 4 [Fe(CN) 6 ] or a saturated aqueous solution of K 4 [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. 2. The method of claim 1 , further comprising removing precipitated Ca(OH) 2 from the aqueous solution. 3. The method of claim 1 , wherein the aqueous solution is substantially free of a co-solvent. 4. The method of claim 1 , wherein the Fe(CN) 6 4− is present in the aqueous solution at a concentration ranging in a range of from 1 M to 3 M. 5. The method of claim 1 , wherein a molar ratio of sodium ions to potassium ions in the aqueous solution is in a range of from 1:10 to 10:1. 6. The method of claim 5 , wherein the molar ratio of sodium ions to potassium ions is in a range of from 0.9:1 to 1.1:1. 7. The method of claim 1 , further comprising adding one or more of a buffering agent, a supporting electrolyte, a viscosity modifier, or a wetting agent to the aqueous solution.
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Classifications
Aqueous electrolytes · CPC title
Indirect fuel cells, e.g. fuel cells with redox couple being irreversible (H01M8/18 takes precedence) · CPC title
- H01M8/188Primary
by recharging of redox couples containing fluids; Redox flow type batteries · CPC title
- H01M8/222Primary
Fuel cells in which the fuel is based on compounds containing nitrogen, e.g. hydrazine, ammonia · CPC title
- C01C3/12Primary
Simple or complex iron cyanides · CPC title
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- What does patent US10374248B2 cover?
- 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.
- Who is the assignee on this patent?
- Lockheed Martin Advanced Energy Storage Llc, Lockheed Martin Energy Llc
- What technology area does this patent fall under?
- Primary CPC classification H01M8/188. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Aug 06 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).