Polyarene mediators for mediated redox flow battery
| DWPI Title: Organic solvent mediated redox flow battery for use in electrical grid storage system, has electrode chamber whose redox-active mediators are circulated through chamber into external container, where container comprises electrode material |
| Abstract: The fundamental charge storage mechanisms in a number of currently studied high energy redox couples are based on intercalation, conversion, or displacement reactions. With exception to certain metal-air chemistries, most often the active redox materials are stored physically in the electrochemical cell stack thereby lowering the practical gravimetric and volumetric energy density as a tradeoff to achieve reasonable power density. In a general embodiment, a mediated redox flow battery includes a series of secondary organic molecules that form highly reduced anionic radicals as reaction mediator pairs for the reduction and oxidation of primary high capacity redox species ex situ from the electrochemical cell stack. Arenes are reduced to stable anionic radicals that in turn reduce a primary anode to the charged state. The primary anode is then discharged using a second lower potential (more positive) arene. Compatible separators and solvents are also disclosed herein. |
| Use: Organic solvent mediated redox flow battery for use in an electrical grid storage system. |
| Advantage: The battery achieves optimum performance if a membrane prevents mediator molecules from passing through from one side of a cell to the other side of the cell while allowing passage of ions from a supporting electrolyte. The battery improves system energy density and efficiency by assembling a flow battery system in which difference between mediator potential and lithium-insertion potential is small. The battery minimizes extra voltage required by mediation during charge or discharge, so that round-trip voltage efficiency, discharge voltage and effective energy content of the system can be maximized. |
| Novelty: The battery (1) has a half-cell electrode chamber coupled to a current collector electrode. A polymeric lithium and sodium ion conducting separator (6) is coupled to the half-cell electrode chamber. First and second redox-active mediators of the half-cell electrode chamber are circulated through the half-cell electrode chamber into an external container, where the external container comprises active electrode material (22), and the active electrode material has redox potential between redox potentials of the first and second redox-active mediators. |
| Filed: 10/15/2014 |
| Application Number: US14515423A |
| Tech ID: SD 13042.1 |
| 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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