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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 >Ionic conductivity and diffusion coefficients of lithium salt polymer electrolytes measured with dielectric spectroscopy
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Ionic conductivity and diffusion coefficients of lithium salt polymer electrolytes measured with dielectric spectroscopy

机译：介电谱法测量锂盐聚合物电解质的离子电导率和扩散系数

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摘要

Ionic conductivity, diffusion coefficients, mobility and ionic concentration for lithium salts dissolved in polymer electrolytes are determined by the modeling of the dielectric loss and spectra. Cation and anion diffusion coefficients are quantified using the Trukhan model depending on the assumed ratio of the cation to anion diffusion coefficients. Measurements are performed for polymer electrolytes consisting of polyethylene oxide (PEO) with dissolved LiClO_4 salts for different sample thicknesses and temperatures ranging from 5 to 105 °C, which comprises both the crystalline and amorphous phases of the composite electrolyte. A good phenomenological description of the dielectric loss spectra is obtained for both the semi-crystalline and amorphous phases. The fraction of mobile ions is estimated to vary from 0.002% at 25 °C (semi-crystalline phase) up to 0.05% at 80 °C (amorphous phase).
机译：溶解在聚合物电解质中的锂盐的离子电导率，扩散系数，迁移率和离子浓度由介电损耗和光谱模型确定。阳离子和阴离子扩散系数使用Trukhan模型进行量化，具体取决于阳离子与阴离子扩散系数的假定比率。对由聚环氧乙烷（PEO）和溶解的LiClO_4盐组成的聚合物电解质进行了测量，以测量不同的样品厚度和5至105°C的温度，该温度既包含复合电解质的结晶相，也包含非晶相。对于半晶相和非晶相，均获得了良好的介电损耗谱的现象学描述。估计移动离子的比例在25°C（半晶相）时为0.002％，在80°C（非晶相）时为0.05％。

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