用萃取活化法制备了PVA基碱性多孔聚合物电解质,其制备过程包括3步:(1)PVA/PEG共混膜的制备;(2)通过萃取制备PVA基多孔膜;(3)用KOH溶液浸泡多孔膜.并采用交流阻抗、扫描电镜和X射线衍射法对该膜进行了分析,结果表明,制得的多孔膜具有不对称的孔状结构,当m(PVA)∶m(PEG)=7 ∶ 3时,样品经过萃取活化后吸液率与离子电导率最大,分别为94.4%和9.71×10-3S/cm;循环伏安测试表明,体系的电化学稳定窗口达到2.2V,经过50个循环后电化学稳定窗口仍保持在2.2V.这种新型碱性多孔聚合物电解质有望应用在镍氢电池中.
The preparation of PVA-based alkaline microporous polymer electrolyte(AMPE) by an extractionactivate method is described. The preparation of AMPE includes three steps: (1) preparing the PVA/PEG membranes,(2) forming PVA-based microporous membranes by extraction of PEG,and (3) activating the samples with a 6mol/LKOH aqueous electrolyte. The membranes are analyzed and characterized by means of AC impedance spectroscope, Xray diffraction and scanning electron microscopy. The experimental results show that the membranes have an asymmetake of 94. 4% ,a high ionic conductivity of 9. 71 × 10-3 S/cm at room temperature. The cyclic voltammetry test indicates that the system exhibits a high electrochemical stability potential of 2.2V even after the 50th sweeping cycle. The results are really encouraging in a way that the AMPE appears to be one of the most significant players for application in nickel metal hydride batteries.
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