用于钒液流电池的耐用且高效的聚四氟乙烯夹层 SPEEK 膜。

Durable and Efficient PTFE Sandwiched SPEEK Membrane for Vanadium Flow Batteries.

机构信息

School of Applied Chemistry and Biological Technology, Shenzhen Polytechnic , Shenzhen 518055, China.

Institute of Green Chemistry and Energy, Graduate School at Shenzhen, Tsinghua University , Shenzhen 518055, China.

出版信息

ACS Appl Mater Interfaces. 2016 Sep 14;8(36):23425-30. doi: 10.1021/acsami.6b07782. Epub 2016 Sep 1.

DOI:10.1021/acsami.6b07782

PMID:27576544

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.

摘要

为了克服磺化聚醚醚酮（SPEEK）膜在钒液流电池（VFB）中循环稳定性差的问题，我们通过使用亲水性多孔聚四氟乙烯（PTFE）薄膜作为 SPEEK 膜的应力保护和电解质缓冲层，展示了一种简单有效的三明治设计。基于这种新型三明治 PTFE/SPEEK/PTFE 膜的 VFB 具有超长的寿命性能，在 2.0 M 钒电解液中以 80 mA cm(-2)的电流密度稳定运行（98.5%的库仑效率和 85.0%的能量效率），循环超过 1000 次。这种简单而强大的策略也可能适用于其他非氟化物膜。