倒相法制备PVDF-HFP基复合微孔聚合物电解质

PVDF-HFP matrix complex micro-porous polymer electrolyte prepared by phase inversion method

为改善纳米粒子在聚合物电解质中的分散效果,采用倒相制膜法,以纳米SiO2为填料,以OP-10为分散剂,制备复合微孔聚偏氟乙烯-六氟丙烯基电解质PVDF-HFP-SiO2(OP-10).用SEM、XRD、交流阻抗法等测试手段对电解质的微观形貌、内部结构和电化学相关性能等进行表征,结果表明:SiO2的加入降低了聚合物电解质膜的结晶度,增强了电解质的拉伸强度,提高了PVDF-HFP-SiO2(OP-10)聚合物电解质的电导率,在20℃时,可达到4.90×10-3S.cm-1,电化学稳定窗口为5.3 V,电解质的离子迁移数为0.83.分散剂OP-10的加入改善了纳米SiO2与基质的界面相容性,改善了SiO2在基质中的分散度.

To improve the distribution properties of nanoparticles in the polymer electrolyte,micro-porous polymer electrolyte PVDF-HFP-SiO2（OP-10） was prepared with phase inversion method by adopting nano-sized SiO2 as the inorganic filler and OP-10 as dispersant.The morphology,crystal structure and electrochemical properties of the electrolyte were characterized by scanning electron microscope（SEM）,X-ray diffraction（XRD）,electrochemical impedance spectra（EIS）.The results showed that the addition of nano-SiO2 suppressed the crystallinity of polymer electrolyte and enhanced the tensile intensity.The ionic conductivity was improved,the highest ionic conductivity（20 ℃） of the PVDF-HFP-SiO2（OP-10） polymer electrolyte was 4.90×10-3S·cm-1,with a high electrochemical stability window of 5.3 V,and the corresponding cation transference number was 0.83.The distribution of SiO2 and interfacial compatibility of nanometer particles were improved by the addition of OP-10.