ELECTROLYTIC SOLUTION FOR REDOX FLOW BATTERY AND REDOX FLOW BATTERY INCLUDING ELECTROLYTIC SOLUTION

An electrolytic solution for a redox flow battery, the electrolytic solution including: a substance including a metal ion; a water-soluble polymer having at least one coordination moiety on a side chain, wherein the at least one coordination moiety coordinates with the metal ion to form a metal complex; and an aqueous solvent.