全钒液流电池离子交换膜性能研究

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

考查了全钒液流电池用离子交换膜PE-01膜和Nafion膜的物理和电化学性能。研究表明:全氟化Nafion膜的离子交换容量和化学稳定性优于PE-01膜,Nafion膜的导电性好,适合大电流充放电,但正、负极钒溶液更易于相互渗透,水的转移较快,电池的库仑效率较低。PE-01均相膜的离子水迁移量与VO2+扩散性比Nafion膜低。

The physical and electrochemical properties of ion exchange membrane PE - 01 and Nation were studied in allvanadium redox flow battery（VRB）. It was shown that the ion exchange capacity （IEC） and chemical stability of Nation membrane was better than that of PE - 01 membrane. In addition, Nation membrane with high conductivity was suitable for high charge - discharge current, but it was easier for vanadium solution to permeate through the Nation 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 VO^2＋ diffusibility than Nation membrane.