聚氨酯/LiCF_3SO_3电解质体系的导电机理  

Ionic Conducting Mechansim of Polyurethane/LiCF_3SO_3 Electrolytes

作　　者：方滨[1] 王新灵[1] 唐小真[1] 竺品芳[2] 

机构地区：[1]上海交通大学化学化工学院,上海200240 [2]上海交通大学分析测试中心,上海200030

出　　处：《上海交通大学学报》2001年第4期570-573,共4页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目! (5 990 30 0 4)

摘　　要：利用 FT- Raman、FT- IR和复数阻抗谱 ,对聚氧化乙烯聚氨酯 /Li CF3SO3固体电解质样品中离子在聚合物电解质中的导电机理进行了研究 .发现导电离子以自由离子、离子对和聚集体的形式存在于体系中 ,离子状态随盐浓度不同发生变化 ,自由离子比率随温度的上升而下降 ;对离子的存在状态与电导率之间的关系进行了研究 ,发现体系的电导率随自由离子的比率上升而变大 ,初步探讨了离子在体系中的导电机理 ;对 Nernst- Einstein公式在聚合物电解质体系的应用做了校正 ,建立了合理的自由离子浓度和电导率的关系 .Solid poly(ethylene oxide) urethane electrolytes were characterized by FT Raman, FT IR and impedance analysis. The ionic conducting mechanism of polymer electrolytes was investigated. The results of FT Raman and FT IR show the three types of ions: free ions, ion pairs and ion congeries. The different concentration of ions has an important effect on ionic state and ionic conductivity. Free ionic ration in polyurethane/LiCF 3SO 3 decreases with the increase of temperature. The conductivity of polyurethane/LiCF 3SO 3 increases with the increase of free ionic ration. The ionic conducting mechanism was discussed in the principium. The appliance of Nernst Einstein formula in polymer electrolytes was revised rationally; the relation between free ionic ration and conductivity was soundly established.

关 键 词：聚氨酯 离子电导率 聚合物固体电解质 导电机理 锂电池 自由离子 离子对 

分 类 号：O631.23[理学—高分子化学]