PVP/PVDF-HFP微孔聚合物电解质的制备及性能

摘要

以聚偏氟乙烯-六氟丙烯(PVDF-HFP)和聚乙烯基吡咯烷酮(PVP)为基质材料,采用倒相法,在不同的PVP∶PVDF-HFP配比下合成PVP/PVDF-HFP微孔聚合物电解质膜,将制备的微孔膜浸入电解液中活化得到了一系列锂离子电解质膜,并通过扫描电镜、力学、红外光谱进行能分析.研究结果表明:所制备的微孔聚合物电解质膜在PVP∶PVDF-HFP配比(质量比)为0.2∶1时综合性能最好,其吸液率为210％,抗拉强度为2.86N/mm2,电导率为1.82×10-3S/cm,电化学稳定窗口为5.7V.%PVP/PVDF-HFP micropores membranes based on PVDF-HFP and PVP were prepared by the phase transfer method with different mass ratios of PVP to PVDF-HFP. The membranes were characterized by means of SEM, FTIR, AC impedance and linear scan voltammetry methods. The results show that the optimium mass ratio of PVP to PVDF-HFP is 0.2:1. The liquid absorption rate of the polymer electrolyte is 210%. It shows a good tensile strength of 2.86 N/mm2. The ionic conductivity is 1.82 × 10-3 S/cm, and the electrochemical stable window is S.7 V.