期刊
POLYMER BULLETIN
卷 78, 期 8, 页码 4183-4204出版社
SPRINGER
DOI: 10.1007/s00289-020-03314-0
关键词
Sulfonated polyimide; Polyvinyl alcohol; High selectivity; Vanadium redox flow battery
资金
- National Natural Science Foundation of China [51173115]
By preparing and characterizing a novel series of sulfonated polyimide (SPI)/polyvinyl alcohol (PVA) composite membranes, this study showed improved performance in vanadium redox flow battery (VRFB), as evidenced by lower self-discharge rate, higher coulombic efficiency, and energy efficiency in single-cell tests. The composite membranes also exhibited stable performance for up to 100 cycles without significant decline in energy efficiency.
A novel series of sulfonated polyimide (SPI)/polyvinyl alcohol (PVA) composite membranes applied in vanadium redox flow battery (VRFB) is prepared and characterized in this work. With the hydrophilicity and good barrier of PVA, the composite membranes exhibit better hydrolysis stability and vanadium ion resistance than normal SPIs with five-membered rings. In VRFB single-cell tests, because of the highest proton selectivity, the SPI5/PVA5 composite membrane shows lower self-discharge rate, higher coulombic efficiency, and energy efficiency (EE) (79.5% vs 77.8% at 30 mA cm(-2)) than that of Nafion117. Besides, the composite membranes present stable performances up to 100 cycles without significant decline in EE.
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