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Redox flow batteries (RFBs) have gained popularity as large-scale energystorage systems for wind and solar powered grids. Modern RFB systems are basedon highly corrosive and/or flammable electrolytes. Organic redox active speciesfor RFBs are gaining commercial traction, but there is a trade-off in choosingaqueous or non-aqueous electrolytes in terms of rate capabilities, energydensity, safety and cost. While modification of organic redox molecules tomitigate these issues is prevalent in the literature, the search for novelelectrolyte systems is scarce. Here we present microemulsion-based electrolytesas an alternative for the next generation of organic RFBs. Micro-emulsionelectrolytes (MEs) offer the advantages of decoupled solubility and ionicconductivity, broad electrochemical windows, non-flammability, simplefabrication modes and low cost of constituent chemicals. The electrochemicalproperties of organic redox species in MEs have been investigated for RFBrequirements and a proof-of-concept flow cell with a widely studied redoxsystem and a commercial membrane is shown. The compositions of MEs can betailored to the redox system, making them a platform of electrolytes for allorganic redox systems under consideration and benefit.

Re-discovering micro-emulsion electrolytes: a biphasic electrolyte platform for Organic redox flow batteries