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

To improve the distribution properties of nanoparticles in the polymer electrolyte, micro-porous polymer electrolyte PVDF-HFP-SiO 2(OP-10) was prepared with phase inversion method by adopting nano-sized SiO 2 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-SiO 2 suppressed the crystallinity of polymer electrolyte and enhanced the tensile intensity. The ionic conductivity was improved, the highest ionic conductivity (20°C) of the PVDF-HFP-SiO 2(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 SiO 2 and interfacial compatibility of nanometer particles were improved by the addition of OP-10.