Abstract
Redox flow batteries (RFBs) are regarded as technique-of-choice for load levelling and peak shaving for the utilization of renewable energy sources, and are key component in smart grid network.[1,2] Electrolyte chemistry is a key consideration for the performance enhancement.[3-9] The conventional RFBs using non-organic redox species in aqueous H2SO4, KOH and NaCl, with limited operating voltage and volumetric energy density. Development of new high-performance electrolytes is highly important for speeding up the market penetration of RFBs. Herein, we explore the feasibility of using “water-in-ionic liquid” supporting electrolytes for tailoring the properties of electrolytes, including the electrochemical stability window, temperature adaptability, solubility of redox-active organics and chemical/electrochemical stability and reversibility of active materials.
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