Perfluorosulfonic acid ion exchange membrane for flow battery as well as preparation method and application of perfluorosulfonic acid ion exchange membrane

The invention relates to the field of ion exchange membrane preparation, and discloses a perfluorosulfonic acid ion exchange membrane for a flow battery as well as a preparation method and application of the perfluorosulfonic acid ion exchange membrane. The perfluorosulfonic acid ion exchange membrane with two molecular weight components is prepared according to different solubilities of different molecular weight components in perfluorosulfonic acid resin in a solvent under different conditions. The perfluorosulfonic acid ion exchange membrane prepared by the invention has high ion selectivity and mechanical strength, and the assembled flow battery has high coulombic efficiency and low self-discharge rate, and is suitable for popularization and use in flow batteries. 本发明涉及离子交换膜制备领域，公开了一种液流电池用全氟磺酸离子交换膜及其制备方法和应用。通过全氟磺酸树脂中不同分子量组分在不同条件下在溶剂中的溶解性不同，制备出具有两种分子量组分的全氟磺酸离子交换膜。本发明所制备的全氟磺酸离子交换膜具有较高的离子选择性和机械强度，组装的液流单电池具有较高的库仑效率和低自放电速率，适合在液流电池中推广使用。