Abstract
The advanced anion-exchange membranes with the poly(3,3’-(hexyl)bis(1-vinylimidazolium)bromide), PHVB, was synthesized by inter-polymerization of a 3,3'-(hexyl)bis(1-vinylimidazolium) bromide in poly(vinyl chloride), PVC, solution. We confirmed the successful preparation of the advanced anion-exchange membrane (AEM) such as ionic conductivity (S/cm), water uptake (%), ion-exchange capacity (meq/g), vanadium permeability, thermal properties, and SEM analysis, respectively. The vanadium redox flow battery (VRFB) performances using the prepared AEM based on PHVB/PVC composite polymers in organic electrolytes was examined. In the prepared advanced AEM, the maximum voltages reached 2.5 V under the fixed current value of 0.005mA. The synthesized advanced AEM has also good stability with organic electrolyte by battery performance under 1000 cycles. As results, the advanced AEM based on PHVB/PVC prepared by the inter-polymerization is suitable for use as a battery separator in VRFB.
Highlights
Vanadium redox flow battery (VRFB) has received considerable attention in recent years due to its flexibility in design and its facility to regenerate the electrolyte solution
Vanadium permeability was calculated 5.821⨯10-5 cm2/min. These results show that the anion-exchange membrane (AEM) can be used successfully as a non-aqueous vanadium redox flow battery (VRFB) membrane
In the Thermal gravimetric analysis (TGA) curves of AEM, the first small weight loss (%) around 100 oC is due to the loss of moisture on the PHVB with hydrophilic property, and the degradation of the side chain leads to a second weight loss at 230 oC, while a 3rd weight loss appeared at 400 oC due to a chief chain degradation in the polymer main chain
Summary
Vanadium redox flow battery (VRFB) has received considerable attention in recent years due to its flexibility in design and its facility to regenerate the electrolyte solution. In order to apply for the organic VRFB system, we prepared the sulfonated poly(ether ether ketone) (SPEEK) membrane with cross-linking by DMF solvent casting method [19]. This SPEEK membrane has insoluble properties in acetonitrile electrolyte, while the SPEEK membrane has the permeability of vanadium ions because of the cation exchange sulfonic acid group of SPEEK membrane. In order to overcome the higher permeability of vanadium ions in in acetonitrile electrolyte, we selected the poly(vinyl chloride) as base materials because this polymer has insoluble properties in organic solvents except for ketone’s solvents and have good physical, chemical properties. The vanadium redox flow battery (VRFB) performances using the prepared AEM based on PHVB/PVC composite polymer in organic electrolytes were done
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