聚苯醚阴离子膜的改性及在钒电池中的性能

阴离子交换膜具有优异的阻钒性能,但是其电化学性能和化学稳定性低于阳离子交换膜,阻碍了其在全钒氧化还原电池中的应用。选用国内商业化聚苯醚(PPO)阴离子膜作为基膜,采用了两种不同的方法在阴离子交换基膜中引入阳离子交换基团成为两性离子交换膜。结果表明,二种改性方法均能提高膜的IEC、电导率等基本性能和电化学性能。由于全氟磺酸溶液(PFSA)改性后隔膜的阻钒离子能力显著提高,该膜组装的电池的能量效率和电流效率分别提高3.2%和6.7%。

Modified PPO anion exchange membrane for vanadium redox battery application

Anion exchange membranes have the low vanadium ions permeability for its application in vanadium redox system(VRB),but its low chemical stability and poor cell performance of the membrane is a crucial obstacle.In this study,a low cost commercially available polyphenylene oxide(PPO) anion exchange membrane was selected to modify with different methods.The anion exchange membrane introduced strong cation-exchange groups after modification.The performance tests with different membranes indicate that the basic characteristics and electrochemical properties with modified membrane are improved.The perfluorinated sulfonic acid solution(PFSA) is higher.Due to low vanadium ions permeability,the columbic efficiency and energy efficiency of the VRB employing modified membrane with the perfluorinated sulfonic acid solution(PFSA) is increased by 6.7 % and 3.2 %,respectively.