Polyoxometalate active charge-transfer material for mediated redox flow battery
| DWPI Title: Redox flow battery comprises a half-cell electrode chamber coupled to an electrode, where the half-cell electrode chamber comprises a first redox-active mediator and a second redox-active mediator, and a separator |
| Abstract: Redox flow batteries including a half-cell electrode chamber coupled to a current collecting electrode are disclosed herein. In a general embodiment, a separator is coupled to the half-cell electrode chamber. The half-cell electrode chamber comprises a first redox-active mediator and a second redox-active mediator. The first redox-active mediator and the second redox-active mediator are circulated through the half-cell electrode chamber into an external container. The container includes an active charge-transfer material. The active charge-transfer material has a redox potential between a redox potential of the first redox-active mediator and a redox potential of the second redox-active mediator. The active charge-transfer material is a polyoxometalate or derivative thereof. The redox flow battery may be particularly useful in energy storage solutions for renewable energy sources and for providing sustained power to an electrical grid. |
| Use: A redox flow battery. |
| Advantage: The redox flow battery utilizes mediator molecules that are designed on the molecular level to possess redox potentials for obtaining high round-trip energy efficiency and high energy density. In mediated flow batteries, mediator molecules, or charge carriers, participate in the electrochemical electrode reactions at the cell or stack while the energy is stored in immobile charge-transfer compounds (also known as charge-storage compounds) located in containers (e.g. reactors, tanks, or vessels) separate from the cell or stack. The charge-transfer compounds do not react directly on the electrodes but react with one or more mediators, which in turn react in the electrode chamber in the cell. Thus, solid materials with high charge-storage capacity per unit mass or volume can be used in the mediated flow battery system without having to flow through the electrode chamber in the cell. Also, the redox flow battery possesses the main advantages of both flow batteries (the ability to scale energy content and power independently) and solid phase charge store, e.g. lithium batteries (high energy density). |
| Novelty: A redox flow battery comprises: a half-cell electrode chamber coupled to an electrode, where the half-cell electrode chamber comprises a first redox-active mediator and a second redox-active mediator, where the first redox-active mediator and the second redox-active mediator are circulated through the half-cell electrode chamber into a container comprising an active charge-transfer material; and a separator coupled to the half-cell electrode chamber. |
| Filed: 12/12/2014 |
| Application Number: US14569033A |
| Tech ID: SD 13043.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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