【摘要】 以聚氧化乙烯/高氯酸锂络合物((PEO)8LiClO4)为基体,通过钛酸四丁酯的水解缩合反应在基体中原位生成TiO2粒子,制备了TiO2/(PEO)8LiClO4复合聚合物电解质膜。采用SEM、DSC和交流阻抗方法分别研究了电解质膜的表面形貌、热性能和离子导电性能。结果表明,原位生成的TiO2粒子均匀分散于PEO基体中。复合TiO2后电解质膜的玻璃化转变温度和结晶度降低。电解质膜的离子导电行为满足Arrhenius方程,并在5%TiO2含量时体系的电导率出现最大值5.5×10-5S/cm(20℃)。以此膜为电解质组装的全固态聚合物锂电池放电时电压平稳,20次循环后放电容量保持在107 mAh/g。更多还原

【Abstract】 TiO₂ /（PEO）₈LiClO₄ composite polymer electrolyte films were prepared by a solution cast method.TiO₂ particles were in-situ formed in（PEO）₈LiClO₄ matrix by simply mixing PEO,LiClO₄ and tetrabutyl titanate and then drying.The morphology,thermal performance and conductivity of the films were studied using SEM,DSC and electrical impedance spectroscopy,respectively.The results show that the in-situ formed TiO₂ particles are found（uniformly） dispersed in PEO matrix.The glass transition temperature and crystallinity of the films are lowered due to the presence of TiO₂.The conductive behaviour of the films follows an Arrhenius type relation.A maximal conductivity 5.5×10^-5S/cm at 20℃ of the TiO₂/（PEO）₈LiClO₄ film was obtained at 5% mass fraction of TiO₂.The（polymer） lithium ion battery with the electrolyte films exhibits stable discharge voltage.The discharge specific（capacity） could still retain 107mAh/g after 20 cycles.更多还原