Physical and Electrochemical Properties of Electrospun PVDF Microporous Membranes with Different Structure Morphology

【摘要】 PVDF-based nonwoven membranes were prepared from PVDF solution in an acetone and N, N-dimethylacetamide (DMAc) mixture using the electrospinning method. Under different processing conditions, electrospun PVDF membranes (EPMs) with four representative structures including round fibers, beaded, cross linked and droplets structures were obtained. The morphology of the EPMs was observed under a scanning electron microscope (SEM) and theirs mechanical properties were measured by the tensile tests. Due to theirs nano-order fibers structure, these EPMs show good wettability with electrolyte and a high amount of electrolyte uptakes. Consequently, the electrospun PVDF polymer electrolytes (EPPEs) exhibit high ionic conductivity at 25 ℃. Besides theirs good cycling performance, these cells with these EPPEs also show a good rate property and can retain 81% of discharge capacity at 2C rate as compared to that at C/5 rate.更多还原

【Abstract】 PVDF-based nonwoven membranes were prepared from PVDF solution in an acetone and N, N-dimethylacetamide (DMAc) mixture using the electrospinning method. Under different processing conditions, electrospun PVDF membranes (EPMs) with four representative structures including round fibers, beaded, cross linked and droplets structures were obtained. The morphology of the EPMs was observed under a scanning electron microscope (SEM) and theirs mechanical properties were measured by the tensile tests. Due to theirs nano-order fibers structure, these EPMs show good wettability with electrolyte and a high amount of electrolyte uptakes. Consequently, the electrospun PVDF polymer electrolytes (EPPEs) exhibit high ionic conductivity at 25 ℃. Besides theirs good cycling performance, these cells with these EPPEs also show a good rate property and can retain 81% of discharge capacity at 2C rate as compared to that at C/5 rate.更多还原