An improved proton conductivity and structure stability of SPEEK/SPPS blend membranes for vanadium redox flow battery

2021 ◽  
Author(s):  
Penghua Qian ◽  
Yunhu Jiang ◽  
Haixia Wang ◽  
Lei Zhang ◽  
Haifeng Shi
Keyword(s):  
Proton Conductivity ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Polyphenylene Sulfide ◽  
Vanadium Redox Flow Battery ◽  
Structure Stability ◽  
Redox Flow Battery ◽  
High Proton ◽  
Exchange Membrane ◽  
Vanadium Redox

The sulfonated polyphenylene sulfide (SPPS) containing a rigid main chain is introduced into the SPEEK-based proton exchange membrane to approach the high proton conductivity and dimensional stability. Under the varied...

SPES/PVDF/TPA composite membrane as an alternative proton exchange membrane in vanadium redox flow battery application

2017 ◽  
Vol 30 (3) ◽  
pp. 312-317 ◽  
Author(s):  
Xiaojuan Lian ◽  
Xin Yang ◽  
Hongdong Liu ◽  
Haitao Liu ◽  
Jiang Zhu
Keyword(s):  
Ion Exchange ◽  
Single Cell ◽  
Composite Membrane ◽  
Proton Exchange ◽  
Ion Exchange Membrane ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Exchange Membrane ◽  
Vanadium Redox

A new kind of composite membrane consisting of sulfonated poly(ether sulfone) (SPES), poly(vinylidene fluoride) (PVDF), and phosphotungstic acid (TPA) has been prepared and employed as the ion-exchange membrane for vanadium redox flow battery (VRB) application. The addition of the highly crystalline and hydrophobic PVDF effectively confines the swelling behavior of SPES/PVDF/TPA. The composite membrane exhibits one order of magnitude lower vanadium ions permeability and much better single cell performance compared to pristine SPES and Nafion 115 membranes. The single cell with SPES/PVDF/TPA membrane shows much lower capacity loss, higher coulombic efficiency (>97%), and higher energy efficiency (>82%) than which with Nafion 115 membrane. In the self-discharge test, single cell with SPES/PVDF/TPA membrane shows much longer duration in the open-circuit voltage decay than which with Nafion 115 membrane. With all the good performances and low cost, the SPES/PVDF/TPA membrane is expected to have excellent commercial prospects as ion-exchange membrane for VRB system.

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