As the core component of vanadium redox flow battery(VRB),ion exchange membrane plays the role of transporting ions and blocking the penetration of vanadium ions.Perfluorosulfonic acid resin(PFSA)is modified through blending it with tri vinyldiamine(DABCO)salt ion compound to obtain an amphoteric ion blending membrane.Based on DABCO-PFSA blending membrane,the blending membrane prepared by supramolecular crosslinking method with non-covalent interaction of anionics and cations exhibits an improved comprehensive performance.Polycationic PDABCO is synthesized through optimizing the two-component structure difference of the blending membrane,and blended with PFSA to prepare the membrane that obtains good mechanical properties and reduces vanadium ion permeation due to the supramolecular crosslinking between polymer chains.The permeability of vanadium ion is 0.25×10-6 cm2·min-1 for PDABCO-PFSA-7.5％membrane.In VRB test,the coulombic efficiency of PDABCO-PFSA-7.5％membrane reaches 88.43％at a current density of 160 mA·cm-2.
amphoteric ion blend membranesVRBvanadium ion permeabilitysupramolecular crosslinking network
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