改性多孔聚偏氟乙烯凝胶聚合物电解质膜的制备与性能分析

Preparation and characterization of modified microporous PVdF gel polymer electrolyte membrane

通过分散聚合制备了丙烯腈-甲基丙烯酸聚乙二醇单甲醚酯共聚物（Poly（AN-co-PEGMEMA））,并将其共混聚偏氟乙烯PVdF（Poylinylidene Fluioride）以制备改性多孔PVdF凝胶聚合物电解质膜.通过扫描电镜观察多孔膜外观,膜的孔径约在1.0-5.0μm之间,这有利于液体电解质的进入;此外,由于共混物极性较高使多孔膜有较好液体电解质溶涨能力.最终多孔凝胶聚合物电解质室温离子导电率较高,可达10^-3S.cm^-1数量级,其电化学稳定窗口超过4.6 V,这些性能都表明其在聚合物锂离子电池的开发中具有较好的应用潜能.

The microporous PVdF gel polymer electrolyte membrane with modification of Poly （ AN - co - PEGMEMA） is prepared synthetically via the dispersion polymerization. Through the observation with the scanning electron micrograph, the average pore size on the membrane is in the range from 1.0 um to 5.0 um. Moreover, the polarity of the blending polymer is high and with a good ability of electrolyte solution uptake. The prepared microporous PVdF gel polymer electrolyte shows that the high ionic conductivity is at 10-3S · cm^- 1 level at the room temperature. In addition, the electrochemical stability window can exceed 4.6 V, and the microporous gel polymer electrolyte can be a potential candidate for the polymer electrolyte in polymer lithium-ion battery.