A new kind of diepoxy-terminated quaternary ammonium salt (TQ) was synthesized via two-step reactions.The TQ was used as a crosslinking agent,and the cross-linking occurred between the epoxy groups of TQ and the pendant amino group of a polybenzimidazole (H2N-PBI).By controlling the molar ratio of the epoxy group to the amino group,a series of new polybenzimidazole anion exchange membranes H2N-PBI-TQ(x/y) with different ion exchange capacities were prepared.Bisphenol A diglycidyl ether was employed as a co-crosslinking agent,by controlling the molar ratio of the two crosslinking agents,a series of new polybenzimidazole anion exchange membranes H2N-PBI-TQ(x)-A with different crosslinking densities were further prepared.These anion exchange membranes had good mechanical properties and thermal stability.As the increase of ion exchange capacity,the water absorption,swelling rate and ion conductivity of these membranes also increased accordingly.Compared with the vanadium flow battery assembled with Nafion212 membrane,the battery assembled with the H2N-PBI-TQ(1∶1.0)-A showed higher voltage efficiency,higher energy efficiency and larger charge-discharge capacity at a high current density (80mA/cm2).Furthermore,after the battery underwent charge-discharge for 100 cycles at a high current density (80 mA·cm-2),its coulombic efficiency,voltage efficiency and energy efficiency didn't decrease significantly,and retained a high residual discharge capacity of 57%,indicating good cycle stability of the battery.
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基金资助
国家“973”计划项目(2014CB643600)
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