Study on Ion Exchange Membrane as a Separator for All-vanadium Redox Flow Battery

The physical and electrochemical properties of ion exchange membrane PE-01 and Nafion were studied in all-vanadium redox flow battery(VRB).It was shown that the ion exchange capacity(IEC) and chemical stability of Nafion membrane was better than that of PE-01 membrane.In addition,Nafion membrane with high conductivity was suitable for high charge-discharge current,but it was easier for vanadium solution to permeate through the Nafion membrane than the PE-01 membrane,leading to quicker water transport and relatively lower coulombic efficiency.Then PE-01 membrane has fewer water transport volume and lower VO²⁺ diffusibility than Nafion membrane.