Abstract
In this work, the polyvinyl pyrrolidone (PVP) was blended with the material of polyvinylidene fluoride modified by imidazolium ionic liquid (PVDF-IL) and finally a kind of porous PVDF-IL-PVP composite membrane was successfully prepared after membrane casting and ethanol treatment. The porous structure of the membranes was evaluated by SEM in detail and the existence of PVP was also proved by FTIR results. Combining with the porous structure and the addition of PVP, the water uptake and acid uptake of the membranes were improved a lot which greatly promoted the affinity between the electrolytes and the membranes. The properties of the PVDF-IL-PVP membranes were investigated systematically. The modified membranes showed a great increment in ion conductivity. Additionally, the vanadium permeabilities of PVDF-IL-PVP20 and PVDF-IL-PVP30 membranes were also lower than that of Nafion115. At the current density of 100 mA/cm2, the battery assembled with the PVDF-IL-PVP30 membrane exhibited higher Coulombic efficiency (97.82% vs. 97.29%), voltage efficiency (85.17% vs. 82.30%), and energy efficiency (83.31% vs. 80.07%) compared to Nafion115, in conjunction with excellent cycle stability in vanadium redox flow batteries (VRFBs). In conclusion, this work provides a kind of well-performed membrane that has great potential for the application in VRFBs.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
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The authors would also like to thank the Analysis and Testing Center of Huazhong University of Science and Technology for its technical support. Besides, this research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
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Zhiguo Wang and Yifei Song: conceptualization, data curation, writing—original draft, and methodology. Jiali Jiang, Wenchao Zhao, Manman Zhang, Zhen Dong, and Long Zhao: writing-review and editing, and supervision. All authors read and approved the final manuscript.
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Wang, Z., Song, Y., Jiang, J. et al. Promoting ion conductivity of imidazolium grafted PVDF membranes through blending PVP for vanadium redox flow batteries. Ionics 30, 901–911 (2024). https://doi.org/10.1007/s11581-023-05342-y
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DOI: https://doi.org/10.1007/s11581-023-05342-y