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Nonaqueous redox flow battery electrolyte comprising an ionic liquid with a metal cation coordinated to redox-active ligands

United States Patent

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May 28, 2019
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Nonaqueous redox flow batteries (RFB) hold the potential for high energy density grid scale storage, though are often limited by the solubility of the redox-active species in their electrolytes. A systematic approach enables an increase the concentration of redox-active species in electrolytes for nonaqueous RFB, starting from a metal-coordination-cation-based ionic liquid. As an example, starting with an ionic liquid consisting of a metal coordination cation (MetIL), ferrocene-containing ligands and iodide anions can be substituted into the original MetIL structure, enabling a nearly 4.times. increase in capacity compared to original MetIL structure. Application of this strategy to other chemistries, optimizing electrolyte melting point and conductivity could yield >10 M redox-active electrons.
May 17, 2017
H01M 8/18 (20060101); H01M 8/1016 (20160101);
STATEMENT OF GOVERNMENT INTEREST This invention was made with Government support under contract no. DE-NA0003525 awarded by the U.S. Department of Energy to Sandia Corporation. The Government has certain rights in the invention.