P(VdF-HFP)-ILs基多孔纤维凝胶电解液的制备

P(VdF-HFP)-ILs porous fibers separator-cum-electrolyte

以偏氟乙烯-六氟丙烯共聚物P(VdF-HFP)为成纤聚合物,聚乙烯吡咯烷酮(PVP)为致孔聚合物,制备得到P(VdF-HFP)/PVP混合静电纺丝纤维。然后利用成纤聚合物和致孔聚合物水溶性的差异,采用超声波辅助水致相分离法,去除水溶性PVP,得到非水溶性P(VdF-HFP)骨架的多孔超细纤维。扫描电子显微镜、孔隙结构分析和显微镜相图分析等结果显示,调节混合静电纺丝纤维中PVP含量,可以得到具有不同中孔/大孔结构的多孔超细纤维膜。以P(VdF-HFP)基多孔超细纤维吸附离子液体(ILs)制备得到凝胶电解液,测试其电化学性能,结果显示由P(VdF-HFP)∶PVP=5∶3静电纺丝纤维制备的P(VdF-HFP)-ILs基多孔超细纤维凝胶电解液显示出宽电化学窗口(3.6 V)、高电导率(0.84 mS·cm^-1)和较高的持液量(295 wt%)。

Poly(vinylidene fluoride-hexafluoropropylene)P(VdF-HFP)and polyvinylpyrrolidone(PVP)blends nano-fibers were prepared using electrospinning method.P(VdF-HFP)ultrafine porous fiber membranes with a three-dimensional network structure,high porosity and electrolyte uptake are prepared via phase separation process under ultrasonic-assisted vibration.The structure and morphology of P(VdF-HFP)fiber membranes are investigated by the scanning electron microscope and porous structure parameter analyzer.The electrochemical performances of P(VdF-HFP)ultrafine porous fiber membrane as separator-cum-electrolyte are investigated.P(VdF-HFP)ultrafine porous fiber membranes derived from P(VdF-HFP)∶PVP=5∶3 possess high electrolyte uptake(295 wt%),high conductivity(0.84 mS·cm^-1)and wide electrochemical stability windows(3.6 V).