Effect of catalyst on structure of(PEO)_8LiClO_4-SiO_2 composite polymer electrolyte films

(PEO)8LiClO4-SiO2 composite polymer electrolytes(CPEs)were prepared by in-situ reaction,in which ethyl-orthosilicate(TEOS)was catalyzed by HCl and NH3.H2O,respectively.The ionic conductivity,the contact angle and the morphology of inorganic particles in the CPEs were investigated by AC impedance spectra,contact angle method and TEM.The conductivities of acid-catalyzed CPE and alkali-catalyzed CPE are 2.2×10-5and 1.1×10-5S/cm respectively at 30℃.The results imply that the catalyst plays an important role in the structure of in-situ preparation of SiO2,and influences the surface energy and conductivity of CPE films directly.Meanwhile,the ionic conductivity is related to the surface energy.

偶联剂原位改性SiO_2提高PEO/LiClO_4/SiO_2电导率

以聚环氧乙烷/高氯酸锂络合物(PEO/L iC lO4)为基体,前驱体正硅酸乙酯(TEOS)在基体中水解缩合的同时加入偶联剂KH560改性原位生成的S iO2,制备了PEO/L iC lO4/KH560-S iO2聚电解质膜,采用SEM、AFM、DSC和交流阻抗方法研究了改性前后聚电解质膜的表面形貌、结晶度和电导率。结果表明,改性S iO2在PEO中分散均匀且粒径仅为35 nm,不同S iO2含量下改性后的聚电解质膜电导率均比改性前明显提高。当S iO2质量分数为10%时,PEO/L iC lO4/KH560-S iO2的电导率达到最大值4.8×10-5S/cm(30℃)。

聚氧化乙烯/接枝SiO_2复合物电解质研究

通过将聚氧化乙烯 ( PEO)分别与表面接枝聚丙烯酸锂和表面接枝二乙二醇甲醚的 Si O2 微粒共混 ,制备得 PEO/接枝 Si O2 复合物膜 ,考察了复合物膜的形态和离子电导性。结果表明 :接枝改性增强了 Si O2 微粒与PEO的相容性 ,降低了 PEO的结晶性 。