Flow battery balancing cells having a bipolar membrane for simultaneous modification of a negative electrolyte solution and a positive electrolyte solution
US-2016308234-A1 · Oct 20, 2016 · US
Electrolyte balancing strategies for flow batteries
US12255368B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12255368-B2 |
| Application number | US-202318505711-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 9, 2023 |
| Priority date | Sep 25, 2013 |
| Publication date | Mar 18, 2025 |
| Grant date | Mar 18, 2025 |
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Abstract
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The present invention is directed to a redox flow battery comprising at least one electrochemical cell in fluid communication with a balancing cell, said balancing cell comprising: a first and second half-cell chamber, wherein the first half-cell chamber comprises a first electrode in contact with a first aqueous electrolyte of the redox flow battery; and wherein the second half-cell chamber comprises a second electrode comprising a catalyst for the generation of O2; and wherein the second half-cell chamber does not contain an aqueous electrolyte.
First claim
Opening claim text (preview).
What is claimed: 1. A redox flow battery comprising at least one electrochemical cell in fluid communication with a balancing cell, said balancing cell comprising: a first and second half-cell chamber separated by a membrane, wherein the first half-cell chamber comprises a first electrode in contact with a first aqueous electrolyte of the redox flow battery; and wherein the second half-cell chamber comprises a second electrode comprising a catalyst for generation of O 2 ; and wherein the second half-cell chamber does not contain an aqueous electrolyte. 2. The redox flow battery of claim 1 , wherein the membrane on the side of the second half-cell chamber is coated with a metal oxide. 3. The redox flow battery of claim 2 , wherein the metal oxide comprises IrO x . 4. The redox flow battery of claim 1 , wherein the membrane is arranged such that water transported from the first half-cell chamber across the membrane is directly oxidized into molecular oxygen and protons. 5. The redox flow battery of claim 1 , wherein the second half-cell chamber comprises a vent configured for egress of oxygen evolved in the second half-cell chamber. 6. The redox flow battery of claim 1 , wherein the first aqueous electrolyte has a pH in the range of from about 9 to about 14. 7. The redox flow battery of claim 1 , wherein the first aqueous electrolyte comprises a negative working electrolyte of the redox flow battery. 8. The redox flow battery of claim 1 , further comprising a porous medium located proximate or adjacent to the membrane in the first chamber, the porous medium providing enhanced convection in that region, leading to neutralization of protons that are injected into the first half-cell chamber. 9. The redox flow battery of claim 1 , wherein the membrane comprises a sulfonated perfluorinated polymer or co-polymer. 10. The redox flow battery of claim 1 , wherein the membrane comprises an ionomer. 11. A working balancing cell, comprising: a first and second half-cell chamber separated by a membrane, wherein the first half-cell chamber comprises a first electrode in contact with a first aqueous electrolyte of an electrochemical device; and wherein the second half-cell chamber is free of added aqueous electrolyte. 12. The working balancing cell of claim 11 , wherein the membrane on the side of the second half-cell chamber is coated with a metal oxide. 13. The working balancing cell of claim 12 , wherein the metal oxide comprises IrO x . 14. The working balancing cell of claim 11 , wherein the membrane is arranged such that water transported from the first half-cell chamber across the membrane is directly oxidized into molecular oxygen and protons. 15. The working balancing cell of claim 11 , wherein the second half-cell chamber comprises a vent configured for egress of oxygen evolved in the second half-cell chamber. 16. The working balancing cell of claim 11 , wherein the first aqueous electrolyte has a pH in the range of from about 9 to about 14. 17. The working balancing cell of claim 11 , wherein the first aqueous electrolyte comprises a negative working electrolyte of the electrochemical device. 18. The working balancing cell of claim 11 , further comprising a porous medium located proximate or adjacent to the membrane in the first chamber, the porous medium providing enhanced convection in that region, leading to neutralization of protons that are injected into the first half-cell chamber. 19. The working balancing cell of claim 11 , wherein the membrane comprises a sulfonated perfluorinated polymer or co-polymer. 20. The working balancing cell of claim 11 , wherein the membrane comprises an ionomer.
Assignees
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Classifications
Fuel cells · CPC title
Depolarisation · CPC title
- H01M4/9016Primary
Oxides, hydroxides or oxygenated metallic salts · CPC title
- H01M8/188Primary
by recharging of redox couples containing fluids; Redox flow type batteries · CPC title
consisting of layers of polymers with at least one layer being ionically conductive · CPC title
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- What does patent US12255368B2 cover?
- The present invention is directed to a redox flow battery comprising at least one electrochemical cell in fluid communication with a balancing cell, said balancing cell comprising: a first and second half-cell chamber, wherein the first half-cell chamber comprises a first electrode in contact with a first aqueous electrolyte of the redox flow battery; and wherein the second half-cell chamber co…
- Who is the assignee on this patent?
- Lockheed Martin Energy Llc
- What technology area does this patent fall under?
- Primary CPC classification H01M4/9016. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Mar 18 2025 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 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).