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

Patent · Tue May 28 04:00:00 EDT 2019

OSTI ID:1568415

Small, Leo J.; Anderson, Travis Mark; Pratt, Harry

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× 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.

• Research Organization: National Technology & Engineering Solutions of Sandia, LLC, Albuquerque, NM (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: NA0003525
• Assignee: National Technology & Engineering Solutions of Sandia, LLC (Albuquerque, NM)
• Patent Number(s): 10,305,133
• Application Number: 15/597,474
• OSTI ID: 1568415
• Country of Publication: United States
• Language: English