Provided is a redox flow battery including a positive electrode cell having a positive electrode and a catholyte solution; a negative electrode cell having a negative electrode and an anolyte solution; and an ion-exchange membrane disposed between the positive electrode cell and the negative electrode cell, wherein the catholyte solution and the anolyte solution each includes a non-aqueous solvent, a supporting electrolyte, and an electrolyte, and wherein the electrolyte includes a metal-ligand coordination compound, and at least one of the metal-ligand coordination compounds includes a ligand having an electron donating group.