Sulfonated polyimide/phosphotungstic acid composite membrane for vanadium redox flow battery applications

2018 ◽  
Vol 31 (6) ◽  
pp. 679-685 ◽  
Author(s):  
Yumei Xu ◽  
Wei Wei ◽  
Yanjun Cui ◽  
Huiguang Liang ◽  
Fang Nian
Keyword(s):  
Mechanical Strength ◽  
Single Cell ◽  
Composite Membrane ◽  
Phosphotungstic Acid ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Sulfonated Polyimide ◽  
Capacity Loss ◽  
Vanadium Redox ◽  
Vanadium Ions

A novel sulfonated polyimide (SPI) membrane embedded with the phosphotungstic acid (SPI/PWA membrane) for vanadium redox flow battery (VRB) has been prepared with low capacity loss, low cost, and high energy efficiency (EE); the proportion of PWA in the composite membrane is 15%. The mechanical strength, vanadium ions permeability, and performance of the membrane in the VRB single cell were characterized. Results showed that the SPI/PWA membrane possessed low permeability of vanadium ions, accompanied by higher mechanical strength than the Nafion117 membrane. The VRB single cell with SPI/PWA composite membrane showed 7.6% higher coulombic efficiency, 4.6% higher EE, but lower capacity loss in comparison with the one with Nafion117 membrane at the current density 40 mA cm−2. The good cell performance, low capacity loss, and high vanadium ions barrier properties of the blend membrane is of significant interest for VRB applications.

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.

Preparation of sulfonated poly(phthalazinone ether sulfone)/poly(vinylidene fluoride) composite membrane for vanadium redox flow battery

2018 ◽  
Vol 31 (4) ◽  
pp. 388-393
Author(s):  
Junli Zhang ◽  
Yan Zhang ◽  
Yaobin Ma
Keyword(s):  
Single Cell ◽  
Composite Membrane ◽  
Vinylidene Fluoride ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Pvdf Membrane ◽  
Poly Vinylidene Fluoride ◽  
Vanadium Redox ◽  
Sulfonated Poly

A sulfonated poly(phthalazinone ether sulfone) (SPPES)/poly(vinylidene fluoride) (PVDF) composite membrane was prepared through a solution-casting method for vanadium redox flow battery (denoted as VRB). The composite membrane exhibits dramatically lower vanadium ions permeability and better cell performance compared to the pristine SPPES membrane and Nafion 115 membrane. The vanadium ion permeability of SPPES/PVDF membrane is one order of magnitude lower than that of Nafion 115 membrane. In the further work, the VRB single cell with SPPES/PVDF composite membrane shows higher columbic efficiency (92.80%) and energy efficiency (84.1%) at the current density 36 mA·cm−2 compared with the single cell with Nafion 115 membrane. In the self-discharge test, SPPES/PVDF membrane showed 1.7 times longer duration in the open circuit decay than Nafion 115 membrane. With all the good properties and low cost, this new kind of composite membrane is of excellent commercial prospects as an ion exchange membrane for VRB systems.

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