Goal: Design and Implement metal-based ionic liquids for higher energy density, lower cost redox flow batteries for stationary energy storage. Approach: Synthesize ionic liquids with redox-active species in the molecular formula and tunable properties via judicious ligand and anion selection. Ionic liquids containing transition metal elements offer the unique opportunity to have high concentrations of active metal in non-aqueous environments. Static cell testing shows that improvements in performance can be achieved through the judicious choice of ligands and anions. Current efforts are focusing on cell engineering to accommodate viscous materials. There is still a need for improved membranes and separators.
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