【摘要】 将实验室经固相反应的精细Li_1.3Al_0.3Ti_1.7（PO₄）₃盐与聚氧化乙烯（PEO）按照不同nEO/nLi摩尔比,通过溶液浇铸法制备了固态聚合物电解质。红外光谱分析表明Li_1.3Al_0.3Ti_1.7（PO₄）₃盐与PEO之间有络合产生。SEM照片显示PEO晶体外层为无定形相所包覆形成的胞状结构。经电化学阻抗（简称EIS）法测试发现聚合物电解质膜的室温阻抗谱图是由高频处一压缩的半圆和低频下一条直线组成,而高温时的阻抗谱主要为一条直线。离子电导率的测试结果得到当nEO/nLi=16时,聚合物电解质室温下电导率约为10-6S/cm,343K时达到10-4S/cm。离子迁移率的数据表明聚合物电解质为离子和电子共混的导体,但在聚合物电解质体系中电荷的迁移主要是由离子作为载流子导电造成的,由测试结果可得此电解质为离子导体。更多还原

【Abstract】 Solid polymer electrolyte films were prepared from poly （ethylene oxide） （PEO） and fine Li_<sup>1.3 Al_<sup>0.3 Ti_<sup>1.7 （PO₄）₃ salt in appropriate ratios of n_<sup>EO /n_<sup>Li =8-50 by a solution-cast technique. The complexation of Li_<sup>1.3 Al_<sup>0.3 Ti_<sup>1.7 （PO₄）₃ salt with PEO was directly detected by infrared （IR） spectroscopy. A cellular structure formed by the PEO crystallites, which were covered by the amorphous complexed layer, was observed under SEM. The room temperature impedance spectra of the polymer films exhibited a shape of depressed semicircle in high frequency range and inclined line in low frequency range by Electrochemical Impedance Spectroscopy （EIS） measurement, but the high temperature ones were mainly the inclined lines. Measurements of ionic conductivity show that, with n_<sup>EO /n_<sup>Li  = 16, the conductivity of the film is 10^-6 S/cm at room temperature and 10^-4 S/cm at above 343K. The transference number data show that the polymer films is a mixed （ionic + electronic） conductor, and that the charge transport in the polymer electrolyte system is predominantly due to the ions.更多还原