Organic positive electrode active material for aqueous redox flow battery

A redox flow battery which is charged/discharged, comprising:

• a positive electrode cell comprising a positive electrode and a positive electrode electrolyte;
• a negative electrode cell comprising a negative electrode and a negative electrode electrolyte;
• an ion exchange membrane disposed between the positive electrode cell and the negative electrode cell;
• and
• a positive electrode electrolyte tank configured to supply the positive electrode electrolyte to the positive electrode cell by driving a pump and having the positive electrode electrolyte stored therein
• and a negative electrode electrolyte tank configured to supply the negative electrode electrolyte to the negative electrode cell by driving a pump and having the negative electrode electrolyte stored therein,
• wherein each of the positive electrode electrolyte and the negative electrode electrolyte comprises
• an electrode active material and an aqueous solvent,
• wherein the positive electrode active material included in the positive electrode electrolyte comprises a compound represented by the following Formula 1, and does not comprise vanadium ions, and
• wherein the negative electrode electrolyte contains positive bivalent vanadium ions (V2+) and positive trivalent vanadium ions (V3+):
• wherein R1 is NH2, and R2 to R5 are H.