碱性纳米复合聚合物电解质研究

Study of Alkaline Nano-composite Polymer Electrolytes

为了提高聚氧化乙烯(PEO)/KOH 基碱性聚合物电解质的电导率, 制电解质膜时分别将纳米 TiO2、纳米β-Al2O3和纳米 SiO2添加到 PEO/KOH 体系中, 制备出了兼顾电学和力学性能的碱性纳米复合聚合物电解质. 交流阻抗测试显示, 其室温(28 ℃)电导率可达到 10-3 S?cm-1数量级. 循环伏安研究表明, 制得的电解质膜在不锈钢惰性电极上的电化学稳定窗口约为 1.6 V. 分别研究了聚合物电解质膜中 KOH, H2O, 无机纳米粉末的含量以及温度对体系电导率的影响.

In order to enhance the ionic conductivity of polyethylene oxide (PEO)-KOH based polymer electrolytes, three types of ceramic nano-powders, i.e., TiO2, beta-Al2O3 and SiO2 were added to PEO-KOH complex respectively, and the corresponding alkaline polymer electrolytes containing nano-powders were prepared. The experimental results showed that the prepared polymer electrolytes exhibited a high ionic conductivity at room temperature, typically 10(-3) S(.)cm(-1) as measured by AC impedance method, and moreover good electrochemical stability. The potential stability window is of ca. 1.6 V on stainless steel blocking electrodes, as determined by cyclic voltammetry. The influence of the film composition such as KOH, H2O and nano-ceramic additives was investigated. The relationship between conductivity and temperature was also examined and explained.