We study ternary polymer-polymer-salt blend electrolytes using coarse-grained molecular dynamics. We specifically examine the influence of the polymer hosts’ incompatibility and polarity contrast on electrolyte ion transport characteristics. We find that, at moderate- to high-polarity contrasts, improving the miscibility of the polymer hosts by reducing their inherent incompatibility improves ionic transport, as measured by the ionic conductivity. However, contrary to expectations, ionic conduction slows with increased miscibility in low-polarity contrast electrolytes. Upon examining the underlying material properties, we find that ionic aggregation exhibits trends similar to ionic conductivity and is thus likely the controlling factor in these polymer-blend electrolytes. Our results suggest that ionic conduction can be improved in real polymer electrolytes by choosing chemistries that promote simultaneous miscibility and polarity contrast between the polymer hosts.

中文翻译：

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主体不相容性和极性对比对三元聚合物-聚合物-盐共混电解质中离子迁移的影响

我们使用粗粒度的分子动力学研究三元聚合物-聚合物-盐混合电解质。我们专门检查聚合物主体的不相容性和极性对比对电解质离子传输特性的影响。我们发现，在中等极性到高极性的对比下，通过减少其固有的不相容性来改善聚合物主体的可混溶性，可以改善离子的传输，如通过离子电导率测量的。然而，与预期相反，在低极性造影剂电解质中，离子传导随着混溶性的增加而减慢。通过检查基本的材料性能，我们发现离子聚集表现出与离子电导率相似的趋势，因此可能是这些聚合物混合电解质的控制因素。