PVDF-HFP基复合微孔聚合物电解质膜的制备与改性

Preparation and Modification of PVDF-HFP Matrix Complex Microporous Polymer Electrolyte Membrane

为了提高聚偏氟乙烯-六氟丙烯(PVDF-HFP)基电解质的离子电导率和机械强度,采用倒相法,制备出复合聚偏氟乙烯-六氟丙烯基电解质PVDF-HFP-Si O2.复合电解质的形貌、结构和电化学性能分别用SEM、XRD和交流阻抗法进行了表征.结果表明:纳米Si O2的加入增强了聚合物的拉伸强度,同时有效降低了聚合物的结晶度.PVDF-HFP-Si O2分解电压为5.1V,离子迁移数为0.81,聚合物电解质的电导率(25℃)为4.84×10-3S·cm-1.

To improve the ionic conductivity and tensile intensity of poly vinylidenefluoride-hexafluoro propylene（PVDF-HFP） matrix polymer electrolyte,complex polymer electrolyte PVDF-HFP-SiO2 is prepared by phase inversion method.The morphology is characterized by scanning electron microscope （SEM）,the crystal structure of the electrolytes by X-ray diffraction （XRD） and the electrochemical properties of the electrolytes by electrochemical impedance spectra （EIS）.The result shows that addition of nano-SiO2 not only enhances the tensile intensity of polymer but also suppresses the crystallinity of polymer electrolyte.The electrochemical oxidation voltage of the PVDF-HFP-SiO2 polymer electrolyte is 5.1V and the correponding cation transference number is 0.81.The ionic conductivity （25℃） of the PVDF-HFP-SiO2 polymer electrolyte is 4.84 × 10-3S · cm-1