Journal
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 18, Issue 3, Pages 729-737Publisher
SPRINGER
DOI: 10.1007/s10008-013-2309-7
Keywords
Vanadium redox battery; Sulfonated polyimide; Composite membrane; Vanadium ion permeability
Categories
Funding
- National Natural Scientific Foundation of China [21206138]
- Key Fund Project of Sichuan Provincial Department of Education [12ZA181]
- Graduates' Innovation Fund of Southwest University of Science and Technology [13ycjj14]
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A sulfonated polyimide (SPI)/TiO2 composite membrane was fabricated by a blend way to improve its performance in vanadium redox flow battery (VRB). Both EDS and XRD results verify the successful preparation of the SPI/TiO2 composite membrane. The surface SEM image shows its homogeneous structure. TG analysis identifies its thermal stability. The SPI/TiO2 composite membrane possesses much lower permeability of VO2+ ions (2.02 x 10(-7) cm(2) min(-1)) and favorable proton conductivity (3.12 x 10(-2) S cm(-1)). The VRB single cell with SPI/TiO2 composite membrane shows higher coulombic efficiency (93.80-98.00 %) and energy efficiency (83.20-67.61 %) at the current density ranged from 20 to 80 mA cm(-2) compared with that with Nafion 117 membrane. And the operational stability of the as-prepared composite membrane is good after 50 times of cycling tests. Therefore, the low-cost SPI/TiO2 composite membrane with excellent battery performance exhibits a great potential for application in VRB.
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