Poly(vinylidenefluoride-co-hexafluoropropylene)/polyimide (PVdF-HFP/PI) composite nanofiber membrane used for lithium ion battery separator was prepared by an electrospinning apparatus equipped
with four needles. Two needles were fed with PVdF-HFP solution and the rest with PI solution and
the two types of polymer solutions were arrayed alternately, in a straight line to form a composite
membrane, which could be referred to as cross-electrospinning, followed by thermal calendering
process to improve the mechanical property of the composite membrane via fusing the PVdF-HFP
component which has lower melting temperature. PVdF-HFP/PI composite membrane showed positive
results in terms of physical properties. Additionally, the cells assembled with the composite separators
exhibited better electrochemical stability, lower interfacial resistance and higher ionic conductivity,
compared with Celgard 2400 PP separator. Conspicuously, the improved performance of lithium ion
battery separator indicated that bicomponent cross-electrospinning method could be potentially applied
for designing future lithium ion battery separator.
Poly(vinylidenefluoride-co-hexafluoropropylene)/polyimide (PVdF-HFP/PI) composite nanofiber membrane used for lithium ion battery separator was prepared by an electrospinning apparatus equippedwith four needles. Two needles were fed with PVdF-HFP solution and the rest with PI solution andthe two types of polymer solutions were arrayed alternately, in a straight line to form a compositemembrane, which could be referred to as cross-electrospinning, followed by thermal calenderingprocess to improve the mechanical property of the composite membrane via fusing the PVdF-HFPcomponent which has lower melting temperature. PVdF-HFP/PI composite membrane showed positiveresults in terms of physical properties. Additionally, the cells assembled with the composite separatorsexhibited better electrochemical stability, lower interfacial resistance and higher ionic conductivity,compared with Celgard 2400 PP separator. Conspicuously, the improved performance of lithium ionbattery separator indicated that bicomponent cross-electrospinning method could be potentially appliedfor designing future lithium ion battery separator.
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