Preparation and properties of polyvinylpyrrolidone & polyvinyl chloride composite proton exchange membrane for vanadium redox flow batteries
Proton exchange membrane(PEM),as a key component of vanadium redox flow battery(VRFB),plays an important role in controlling the performance and cost of VRFB.A series of PVP&PVC composite PEMs were prepared,wherein PVP carried out ion conduction in the membrane due to the protonation of amine groups,and PVC acted as skeleton to support the membrane.By adjust-ing the ratio of PVP and PVC in the composite membrane,the PEM which is suitable for all-vanadium flow battery was obtained.It is found out that with the increase of PVC content in the composite PEM,the mechanical property of the membrane is enhanced,and the transmittance of vanadium ion is de-creased.The conductivity and swelling of the membrane increased with the increase of PVP content.The results show that when the mass ratio of PVP and PVC in the composite membrane is 1∶1,the pro-ton selectivity is 3.8×10 3 S·min·cm-3 which is the highest among the investigated composite mem-branes,so the comprehensive performance of PVP&PVC-1∶1 composite membrane is the best.When the current density is 50 mA·cm-2,the single battery assembled with PVP&PVC-1∶1 membrane is pos-sessed a good charge and discharge capacity.
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