Development of Pore-filled Ion-exchange Membranes for Efficient All Vanadium Redox Flow Batteries

Abstract

: Thin pore-filled cation and anion-exchange membranes (PFCEM and PFAEMs, t m = 25-30 µm) were prepared using a porous polymeric substrate for efficient all-vanadium redox flow battery (VRB). The electrochemical and charge-discharge performances of the membranes have been systematically investigated and compared with those of commercially available ion-exchange membranes. The pore-filled membranes were shown to have higher permselectivity as well as lower electrical resistances than those of the commercial membranes. In addition, the VRBs employing the pore-filled membranes exhibited the respectable chargedischarge performances, showing the energy efficiencies (EE) of 82.4% and 84.9% for the PFCEM and PFAEM, respectively (cf. EE = 87.2% for Nafion 1135). The results demonstrated that the pore-filled ion-exchange membranes could be successfully used in VRBs as an efficient separator by replacing expensive Nafion membrane.

High-Capacity Retention Thermally Reinforced Pore-Filled Anion Exchange Membrane for All-Vanadium Flow Batteries

“…The VRFB performance of the fabricated PFAEM was compared with the literature known pore-filled ion exchange membrane in Figure . − ,− Most of the reported membranes suffer high vanadium ion diffusion resulting in poor long-term cycling efficiency. Kim et al reported an Engelhard titanosilicate-10 and sulfonated poly­(ether ether ketone) (SPEEK)-filled PTFE substrate for VRFBs.…”