静电纺丝法ZrO2/PVDF-PAN超级电容器隔膜的制备及其电化学性能

摘要

采用静电纺丝法,以聚偏氟乙烯(PVDF)和聚丙烯腈(PAN)为基体,通过改变ZrO2的含量,制备了ZrO2/PVDF-PAN复合纤维膜.用SEM和比表面积测试仪(BET)分别对复合纤维膜的形貌和比表面积进行了表征.结果表明:纳米ZrO2的加入量对ZrO2/PVDF-PAN复合纤维膜的形貌有较大影响,随着纳米ZrO2含量的增加,纤维表面变得凹凸不平,提高了纤维膜的比表面积,进而提高了纤维膜的吸液率,且当ZrO2含量为PVDF和PAN总质量的0.4％时达到最大值.将复合纤维膜组装成超级电容器,利用电化学工作站对其循环伏安(CV)和交流阻抗(EIS)性能进行测试,研究了ZrO2的加入对复合纤维膜电化学性能的影响.结果表明:ZrO2的加入提高了ZrO2/PVDF-PAN复合纤维膜的电导率,当ZrO2含量为0.4％时其电化学综合性能最好,其中比容量达126.0 F/g,离子电导率为9.31×10-3 S/cm.%The ZrO2/PVDF-PAN composite membranes based as poly(vinylidene fluoride) (PVDF) and polyacrylonitrile(PAN) with different ZrO2 contents were prepared by electrospinning.The morphology and specific surface area were characterized by SEM and BET,respectively.The results show that the morphologies of the composite membranes depend on the ZrO2 content.With the increasing of ZrO2 content,the surface of fibers becomes unsmooth and the specific surface area and liquid absorption rate increase,and they reach the maximum when the ZrO2 content is 0.4％ of the mass of PVDF and PAN.To study the effect of ZrO2 content on electrochemical performance of composite membranes,super-capacitors were fabricated with the composite membrane as separators.Test results of cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) show that composite membrane with 0.4wt％ ZrO2 possesses excellent electrochemical performance,in which the specific capacitance value and ionic conductivity reach 126.0 F/g and 9.31 × 10-3 S/cm,respectively.