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PVA-PEO碱性聚合物电解质的制备与表征
Preparation and Characterization of An Alkaline Composite PVA-PEO Electrolyte
【摘要】 通过溶解-铸膜法制备了聚乙烯醇(PVA)-KOH-H2O碱性聚合物电解质膜,并向电解质中加入聚氧化乙烯(PEO)来提高离子电导率。X射线衍射(XRD)和红外光谱(FT-IR)结果表明,PEO的加入一定程度上降低了结晶度,薄膜处于无定型态。扫描电镜(SEM)表征结果显示薄膜呈非均匀网络微孔结构。交流阻抗结果表明,该薄膜室温离子电导率在mPEO/m(PVA+PEO)=0.2时达最大,为2.78×10-2S/cm。循环伏安结果表明该薄膜具有较好的电化学稳定性。
【Abstract】 An alkaline composite poly(vinyl alcohol)(PVA)-poly(ethylene oxide)(PEO) electrolyte membrane was prepared by a solution-casting method.PEO was added to improve the ionic conductivity of the electrolyte.X-ray diffraction (XRD) and Fourier transform infrared spectrum(FT-IR) results show that the addition of PEO reduces the crystallinity of PVA.The membrane shows an amorphous phase.Scanning electron microscope (SEM) reveals that the membrane forms a three-dimension network structure with many small pores.Electrochemical impedance spectra results show that when the weight ratio mPEO/m(PVA+PEO) is equal to 0.2,the electrolyte’s ionic conductivity exhibits the highest value,which is 2.78×10-2 S/cm at room temperature.The result of cyclic voltammetry indicates that the polymer electrolyte membrane has promising electrochemical stability.
【Key words】 alkaline polymer electrolyte; poly(vinyl alcohol); poly(ethylene oxide); blend; ionic conductivity;
- 【文献出处】 高分子材料科学与工程 ,Polymer Materials Science & Engineering , 编辑部邮箱 ,2010年11期
- 【分类号】O631.3
- 【被引频次】2
- 【下载频次】293