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Highly efficient vanadium redox flow battery enabled by low permeability membrane regulated by sulfonated polyarylethersulfones.

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Title: Highly efficient vanadium redox flow battery enabled by low permeability membrane regulated by sulfonated polyarylethersulfones.
Authors: Su, Yi1,2 (AUTHOR), Zeng, Pengjin1,2 (AUTHOR), Sun, Fei1,2 (AUTHOR) sunfei_92@zstu.edu.cn, Li, Zhaoning1,2 (AUTHOR), Yu, Yuan1,3 (AUTHOR), Li, Danyang2,4 (AUTHOR), Guo, Yuhai1,2 (AUTHOR) gyh@zstu.edu.cn
Source: Journal of Materials Science. May2026, Vol. 61 Issue 17, p11998-12010. 13p.
Subjects: Vanadium redox battery, Polyethersulfone, Energy density, Ion-permeable membranes, Energy conversion, Biological membranes, Proton conductivity, Membrane permeability (Biology)
Abstract: To advance the large-scale application of vanadium redox flow batteries (VRFBs), developing proton-exchange membranes (PEMs) that combine low cost with high performance has become a key research focus. This research designed and constructed a low permeability PEM regulated by sulfonated polyethersulfones (SPAES), successfully achieving a balance between chemical stability and conductivity. The S1K1 PEM prepared by blending SPAES and SPEEK (Sulfonated Poly (ether ether ketone)) in equal mass ratio exhibits outstanding comprehensive performance. Its ion selectivity (8732.74 S·min−1·cm−3) and proton conductivity (392.1 mS·cm−1) are both higher than those of N212 (20.12 S·min−1·cm−3, 213.9 mS·cm−1), with a vanadium permeability of only 0.499 × 10−8 cm−2·min. Moreover, the VRFB assembled with the S1K1 PEM maintained stable energy efficiency around 70% after 100 cycles at 80 mA·cm−2 and sustained an operable voltage (> 0.8 V) for 445 h. At 350 mA·cm−2, the maximum power density reached 973.51 mW·cm−2 (compared to 916.2 mW·cm−2 for N212). This blended PEM effectively integrates the material advantages of SPAES and SPEEK, offering both high proton conductivity and excellent vanadium resistance properties. Additionally, its simple preparation process and low raw material costs demonstrate promising application prospects, with the potential to accelerate the commercialization of VRFBs. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:To advance the large-scale application of vanadium redox flow batteries (VRFBs), developing proton-exchange membranes (PEMs) that combine low cost with high performance has become a key research focus. This research designed and constructed a low permeability PEM regulated by sulfonated polyethersulfones (SPAES), successfully achieving a balance between chemical stability and conductivity. The S1K1 PEM prepared by blending SPAES and SPEEK (Sulfonated Poly (ether ether ketone)) in equal mass ratio exhibits outstanding comprehensive performance. Its ion selectivity (8732.74 S·min−1·cm−3) and proton conductivity (392.1 mS·cm−1) are both higher than those of N212 (20.12 S·min−1·cm−3, 213.9 mS·cm−1), with a vanadium permeability of only 0.499 × 10−8 cm−2·min. Moreover, the VRFB assembled with the S1K1 PEM maintained stable energy efficiency around 70% after 100 cycles at 80 mA·cm−2 and sustained an operable voltage (> 0.8 V) for 445 h. At 350 mA·cm−2, the maximum power density reached 973.51 mW·cm−2 (compared to 916.2 mW·cm−2 for N212). This blended PEM effectively integrates the material advantages of SPAES and SPEEK, offering both high proton conductivity and excellent vanadium resistance properties. Additionally, its simple preparation process and low raw material costs demonstrate promising application prospects, with the potential to accelerate the commercialization of VRFBs. [ABSTRACT FROM AUTHOR]
ISSN:00222461
DOI:10.1007/s10853-026-12551-z