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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Segmental relaxation and ion transport in polymer electrolyte films by dielectric spectroscopy
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Segmental relaxation and ion transport in polymer electrolyte films by dielectric spectroscopy

机译：介电谱法研究高分子电解质膜中的分段弛豫和离子迁移

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摘要

The glass transition and dielectric relaxation processes of polyethylene oxide (PEO) based polymer salt complexes (PSCs) have been investigated using broadband dielectric spectroscopy, in order to better understand the role of segmental relaxation dynamics in ion transport process. Neat PEO and PSCs consisting of PEO, LiClO4 or LiCF3SO3 were synthesized with and without nano-particulate TiO2 by solution casting method. The dielectric loss (epsilon") spectrum showed two segmental relaxations for both neat PEO and PSCs, and these are assigned as fast and slow segmental relaxation modes. The slow relaxation is associated with cation coordinated segmental motions, where as, the fast relaxation could be due to the motion of PEO chain segments. The strength and location of slow relaxation frequency showed a drastic change in PSCs when compared to neat PEO, and found to depend on the nature of anions in the salts. Furthermore, the temperature dependence of ac conductivity changes seemed to corroborate well with the observed slow relaxation behavior, suggesting that the polymer segmental dynamics play a crucial role in controlling ion transport process in polymer electrolyte systems. (c) 2006 Elsevier B.V. All rights reserved.
机译：为了更好地理解分段弛豫动力学在离子传输过程中的作用，已经使用宽带介电谱研究了基于聚环氧乙烷（PEO）的聚合物盐配合物（PSC）的玻璃化转变和介电弛豫过程。通过溶液流延法合成了含或不含纳米TiO2的纯PEO和由PEO，LiClO4或LiCF3SO3组成的PSC。介电损耗（ε“）谱图显示了纯PEO和PSC的两个节段弛豫，它们分别被指定为快速节段弛豫模式和慢节段弛豫模式。慢弛豫与阳离子协调的节段运动有关，其中快速弛豫可能是由于PEO链段的运动，慢弛豫频率的强度和位置与纯PEO相比在PSC中发生了剧烈变化，并且发现它取决于盐中阴离子的性质。所观察到的缓慢弛豫行为似乎很好地证实了这种变化，这表明聚合物片段动力学在控制聚合物电解质系统中的离子传输过程中起着至关重要的作用（c）2006 Elsevier BV保留所有权利。

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