title: Durable and Efficient PTFE Sandwiched SPEEK Membrane for Vanadium Flow Batteries.
abstract: To overcome the poor cycling stability of sulfonated poly(ether ether ketone) (SPEEK) membrane in vanadium flow batteries (VFB), we demonstrate a facile and effective sandwich design by using hydrophilic porous poly(tetrafluoroethylene) (PTFE) films as a stress protective and electrolyte buffer layer for SPEEK membrane. VFB based on this novel sandwich PTFE/SPEEK/PTFE membrane exhibits super long-life properties, which can steadily run (98.5% of Coulombic efficiency and 85.0% of energy efficiency @ 80 mA cm(-2)) with 2.0 M vanadium electrolyte for more than 1000 cycles. This simple and powerful strategy may also be applied to other nonfluoride membranes.
authors: School of Applied Chemistry and Biological Technology, Shenzhen Polytechnic , Shenzhen 518055, China.
authors: Lihong
authors: L
authors: Yu
authors: Institute of Green Chemistry and Energy, Graduate School at Shenzhen, Tsinghua University , Shenzhen 518055, China.
authors: Jingyu
authors: J
authors: Xi
keywords: SPEEK; capacity fading; cycling performance; membrane; vanadium flow battery