CHLORIDE-FREE ELECTROLYTE COMPOSITION FOR PROLONGED OPERATION AT HIGH TEMPERATURES (>40°C) IN VANADIUM REDOX FLOW BATTERIES

An electrolyte solution for a vanadium redox flow battery, wherein the electrolyte solution comprises vanadium ions, sulfate ions, and phosphoric acid; and further wherein the conductivity a of the electrolyte solution is in the range of 280 mS·cmto 420 mS·cm.