催化方式对(PEO)_8LiClO_4-SiO_2结构与性能的影响

Effect of catalyzer on the properties of (PEO)_8LiClO_4-SiO_2 composite polymer electrolyte films

正硅酸乙酯(TEOS)在聚环氧乙烷/高氯酸锂(PEO/LiClO4)基体中催化水解原位生成(PEO)8LiClO4-SiO2复合物,对酸、碱两种不同催化方式进行了研究。用TEM、DSC、EIS等方法对不同催化方式下所制(PEO)8LiClO4-SiO2复合聚合物电解质样品的结构与性能进行了分析。结果表明,酸、碱不同催化方式对原位生成SiO2粒子的结构有较大影响,酸催化原位生成的SiO2粒子与聚合物基体的相容性比碱催化条件下的好,进而影响了聚合物电解质膜导电性能,当SiO2含量为10%(质量分数)时,电导率均达到最大值,并且酸催化的电导率大于碱催化的电导率,酸催化(PEO)8LiClO4-SiO2和碱催化(PEO)8LiClO4-SiO2在30℃时的电导率分别为2.2×10-5S/cm和1.1×10-5S/cm。

（PEO）8LiCIO4-SiO2 composite polymer electrolytes were prepared by in situ reaction that TEOS was catalyzed both by HCI and NH3-H2O. The ionic conductivity, the images of the inorganic particles in the composite polymer electrolytes were investigated by A. C. impedance spectroscopy, DSC and TEM show that the catalyzer plays a very important role in the structure of in-situ SiO2 which influenced the conductivity of composite polymer electrolyte films directly. When the mass fraction of SiO2 is about 10%, the conductivity of （PEO）8LiCIO4- SiO2 catalyzed both by HCI and NH3. H20 attain a maximum value, the conductivity catalyzed by HCI is higher than NH3 × H2O, it is 2.2 × 10^-5 S/cm and 1.1 × 10^-5 S/cm respectively.