Construction of sulfonated branched polybenzimidazole membranes for application in all-vanadium flow battery

Huiting LI, Xiyang LIU, Jun LONG, Wenheng HUANG, Jinchao LI, Liang CHEN, Qin CHEN, Yaping ZHANG

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Journal of Materials Engineering ›› 2025, Vol. 53 ›› Issue (7) : 201-211. DOI: 10.11868/j.issn.1001-4381.2025.000095
RESEARCH ARTICLE

Construction of sulfonated branched polybenzimidazole membranes for application in all-vanadium flow battery

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Abstract

The sulfonated branched polybenzimidazole （sb-PBI） membranes with theoretical sulfonation degrees of 30%，40%，50%，and 60% are prepared by reacting between synthesized branched polybenzimidazole and 1，4-butane sultone for application in all-vanadium flow battery （VFB）. Among them，the sb-PBI-50 membrane shows excellent vanadium ion resistance （9.34×10-9 cm2/min），proton conductivity （2.05×10-2 S/cm），and selectivity （2.20×106 S·min/cm3）. The coulomb efficiencies （96.26%-98.35%），voltage efficiencies （73.50%-90.19%），and energy efficiencies （71.72%-86.82%） of VFB with sb-PBI-50 membrane are higher than those of commercial Nafion 212 membrane under the current density of 80-280 mA/cm2. In addition，the VFB assembled with sb-PBI-50 membrane can stably carry out 1170 charge-discharge cycles at 140 mA/cm2. The chemical structure and micro-morphologies can remain stable after long-term cycles，indicating that the sb-PBI-50 membrane has good application potential in VFB.

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membrane / sulfonated branched polybenzimidazole / proton conductivity and selectivity / all-vanadium flow battery

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Huiting LI , Xiyang LIU , Jun LONG , et al . Construction of sulfonated branched polybenzimidazole membranes for application in all-vanadium flow battery. Journal of Materials Engineering. 2025, 53(7): 201-211 https://doi.org/10.11868/j.issn.1001-4381.2025.000095

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