%0 Journal Article
%T Preparation and characterization of SPES/PVA (double
%A Guanlin Li
%A Jili Xie
%A Wang Tan
%J High Performance Polymers
%@ 1361-6412
%D 2019
%R 10.1177/0954008317753270
%X The double-layer membrane consisting of sulfonated poly(ether sulfone) (SPES) sub-layer and polyvinyl alcohol (PVA) sub-layer (denoted as SPES/PVA membrane) was prepared and employed as the separator for vanadium redox flow battery (VRB) system to evaluate the vanadium ions permeability and cell performance. The SPES/PVA membrane is a double-layer structure and exhibits dramatically lower vanadium ions permeability and better cell performance compared to the pristine SPES membrane, PVA membrane, and Nafion117 membrane. The vanadium ion permeability of SPES/PVA membrane is one order of magnitude lower than that of Nafion117 membrane. In further work, the single cell with SPES/PVA membrane showed significantly lower capacity loss, higher coulombic efficiency (>92.5%), and higher energy efficiency (>83.9%) than Nafion117 membrane. In the self-discharge test, SPES/PVA membrane showed 1.8 times longer duration in the open circuit decay than Nafion117 membrane. With all the good properties and low cost, this new kind of double-layer membrane is suggested to have excellent commercial prospects as an ion exchange membrane for VRB systems
%K Sulfonated poly(ether sulfone)
%K polyvinyl alcohol
%K vanadium redox flow battery
%K double-layer
%K ion exchange membrane
%U https://journals.sagepub.com/doi/full/10.1177/0954008317753270