【摘要】 应用溶解-铸膜法制备聚乙烯醇(PVA)-KOH-H2O碱性凝胶聚合物电解质膜。用交流阻抗测试电解质膜离子电导率,结果表明随KOH含量增加,电解质膜的电导率先增后减,当m(PVA):m(KOH)=3:4.5时(质量比,下同),室温电导率达到最大值,为4.63×10-2S/cm。聚合物电解质膜的电导率随温度的变化基本符合Arrhenius方程。加入KOH后,PVA结构从晶态向非晶态转变,结晶度降低,热稳定性提高。循环伏安和DSC热分析显示该聚合物电解质膜具有很好的电化学稳定性和热稳定性。有望应用于碱性二次电池。更多还原

【Abstract】 Polyvinyl alcohol(PVA)-KOH-H2O alkaline gel polymer electrolyte was prepared by solution-casting method.The ionic conductivity of the PVA alkaline gel polymer electrolyte was investigated by the electrochemical impedance spectrum method,the results showed that the ionic conductivity first increased and then decreased with the increase of KOH content.When the mass ratio of m(PVA):m(KOH)is 3:4.5,it exhibited the highest ionic conductivity of 4.63×10-2S/cm at room temperature.The temperature dependence of conductivity conforms to Arrhenius equation basically.Addition of KOH can convert the crystalline of PVA into an amorphous phase,reduce the crystallinity and enhance the thermal stability.The cyclic voltammograms and differential scanning calorimetry indicated the gel polymer electrolyte had promising electrochemical and thermal stability.It is suggested that the PVA alkaline gel polymer electrolyte could be applied in alkaline rechargeable batteries.更多还原