Redox flow battery
AssigneeWashington University
InventorsShrihari Sankarasubramanian, Vijay K. Ramani
Life of this patent
Estimating the term…
Abstract
Disclosed herein is a redox flow battery (RFB). The battery generally includes: a positive electrolyte that is a first metal ion, a negative electrolyte that is a second metal ion, an ion exchange membrane positioned between the positive electrolyte and the negative electrolyte. The membrane is configured to restrict and/or prevent the passage of the first metal ion and/or the second metal ion therethrough, and is configured to maintain ionic conductivity between the positive electrolyte and the negative electrolyte.
Claims15
A redox flow battery (RFB), said battery comprising:
- a positive electrolyte comprising a first metal ion,
- a negative electrolyte comprising a second metal ion, wherein
- the first metal ion is at least one of Ti4+ and Ti3+, and the second metal ion has a reduction potential less than or equal to that of Ce4+, or
- the second metal ion is at least one of Ce4+ and Ce3+ and the first metal ion has a reduction potential greater than or equal to that of Ti4+;
- an ion exchange membrane positioned between the positive electrolyte and the negative electrolyte, wherein
- said membrane is configured to restrict and/or prevent the passage of the first metal ion and/or the second metal ion therethrough,
- said membrane is configured to maintain ionic conductivity between the positive electrolyte and the negative electrolyte,
- said membrane is configured to allow the passage of anions and reduce or prevent the flow of cations;
- and
- wherein at least one of the positive electrolyte or the negative electrolyte is an acid;
- and the acid is electrochemically stable.
A method for storing electricity, the method comprising:
- preparing a positive electrolyte that comprises a first metal ion;
- preparing a negative electrolyte that comprises a second metal ion;
- wherein
- the first metal ion is at least one of Ti4+ and Ti3+, and the second metal ion has a reduction potential less than or equal to that of Ce4+, or
- the second metal ion is at least one of Ce4+ and Ce3+ and the first metal ion has a reduction potential greater than or equal to that of Ti4+;
- placing an ion exchange membrane between the positive electrolyte and the negative electrolyte, wherein
- said membrane is configured to restrict and/or prevent the passage of the first metal ion and/or the second metal ion therethrough,
- said membrane is configured to maintain ionic conductivity between the positive electrolyte and the negative electrolyte,
- said membrane is configured to allow the passage of anions and reduce or prevent the flow of cations;
- and
- wherein at least one of the positive electrolyte or the negative electrolyte is an acid;
- and the acid is electrochemically stable.
A method for generating an electrical current, the method comprising:
- preparing a redox flow battery, and
- flowing the positive electrolyte and the negative electrolyte at a flow rate along a surface of the ion exchange membrane thereby generating an electrical current;
- wherein the redox flow battery comprises:
- a positive electrolyte comprising a first metal ion,
- a negative electrolyte comprising a second metal ion, wherein
- the first metal ion is at least one of Ti4+ and Ti3+, and the second metal ion has a reduction potential less than or equal to that of Ce4+, or
- the second metal ion is at least one of Ce4+ and Ce3+ and the first metal ion has a reduction potential greater than or equal to that of Ti2+;
- an ion exchange membrane positioned between the positive electrolyte and the negative electrolyte, wherein
- said membrane is configured to restrict and/or prevent the passage of the first metal ion and/or the second metal ion therethrough,
- said membrane is configured to maintain ionic conductivity between the positive electrolyte and the negative electrolyte, and
- said membrane is configured to allow the passage of anions and reduce or prevent the flow of cations;
- and
- wherein at least one of the positive electrolyte or the negative electrolyte is an acid;
- and the acid is electrochemically stable.
Dependencies are inferred from the claim text.