Electrospinning fibers,with the advantages of high specific surface area,high porosity and inter connected three-dimensional network structure,has a promising application in the field of lithium-ion batteries.To enhance the hydrophilicity and liquid absorption rate of PVDF(polyvinyli-dene fluoride)fibers,nano SiO2 and PVDF are uniformly dispersed in N,N-dimethylformamide as a precursor solution.SiO2/PVDF composite fiber membranes are prepared using the electrospin-ning technique.The microstructure and phase structure of the resulting composite fiber mem-branes are characterized and analyzed,and their mechanical properties and wettability are tested.The results show that the fibers in the SiO2/PVDF composite membrane are randomly distributed with diameters ranging from 0.21 μm to 0.28 and have smooth surfaces.The hydrophilicity of the SiO2/PVDF composite fiber membrane increases with the increase of SiO2 content.When the SiO2 content is 5％(mass fraction),the SiO2/PVDF composite fiber membrane exhibits good performance,with a tensile strength of 27.5 MPa,an elongation at break of 36.32％,a liquid absorption rate of 369.45％,and a porosity of 85.67％,meeting the requirements for use as a membrane in lithium-ion batteries.
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