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首页> 外文期刊>The Journal of Chemical Physics >Diffusive solvent dynamics in a polymer gel electrolyte studied by quasielastic neutron scattering
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Diffusive solvent dynamics in a polymer gel electrolyte studied by quasielastic neutron scattering

机译：准弹性中子散射研究聚合物凝胶电解质中的扩散溶剂动力学

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摘要

A quasielastic neutron scattering study has been performed on a polymer gel electrolyte consisting of lithium perchlorate dissolved in ethylene carbonate/propylene carbonate and stabilized with poly(methyl methacrylate).The dynamics of the solvent,which is crucial for the ion conduction in this system,was probed using the hydrogen/deuterium contrast variation method with nondeuterated solvent and a deuterated polymer matrix.Two relaxation processes of the solvent were studied in the 10-400 mueV range at different temperatures.From analysis of the momentum transfer dependence of the processes we conclude that the faster process(~ 100mueV)is related to rotational diffusion of the solvent and the slower process(~10mueV)to translational diffusion of the solvent.The translational diffusion is found to be similar to the diffusion in the corresponding liquid electrolyte at short distances,but geometrically constrained by the polymer matrix at distances beyond ~5 A.The study indicates that the hindered diffusion of the solvent on a length scale of the polymer network interchain distance(~5-20 A)is sufficient to explain the reduced macroscopic diffusivity and ion conductivity of the gel electrolyte compared to the liquid electrolyte.
机译：对由高氯酸锂溶解在碳酸亚乙酯/碳酸亚丙酯中并用聚甲基丙烯酸甲酯稳定的聚合物凝胶电解质进行了准弹性中子散射研究。溶剂的动力学对于该系统中的离子传导至关重要，采用氢/氘对比变化法，在非氘代溶剂和氘代聚合物基体上进行了研究。研究了溶剂在10-400 mueV范围内在不同温度下的两种弛豫过程。通过分析过程的动量转移依赖性，我们得出结论较快的过程（〜100mueV）与溶剂的旋转扩散有关，而较慢的过程（〜10mueV）与溶剂的旋转扩散有关。发现平移扩散与短距离内相应液体电解质中的扩散相似但在几何上受聚合物基体约束的距离超过〜5A。研究表明聚合物网络链间距离（〜5-20 A）的长度尺度上溶剂的受阻扩散足以解释与液体电解质相比，凝胶电解质的宏观扩散率和离子电导率降低。

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