Abstract The enhancement of lithium ion conductivity is observed in the composite solid electrolyte LiI-MoS2, which was synthesized by ball milling of the mixture of LiI and MoS2. The composite electrolyte shows an ionic conductivity as high as 7.1 × 10−5 S cm−1 at room temperature which is nearly three orders of magnitude higher than the pristine LiI and can be ascribed to the formation of the amorphous interface between the two phases. In addition, the composite electrolyte LiI-MoS2 exhibits a wide apparent electrochemical stability window of −1 to 5 V. X-ray diffraction measurements on the composite inform that original phases are well maintained after ball milling process. Transmission electron microscopy (TEM) and field emission scanning electron microscopy (FE-SEM) reveal the homogeneous distribution of LiI over the surface of MoS2 and the favorable interface for Li-ion migration between the two phases. Our work proposes a novel strategy to design solid electrolytes with high Li-ion conductive, and also provides some possibility for two-dimensional materials to be applied in superior solid electrolytes.

中文翻译：

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在 LiI-MoS2 复合材料中观察到快速锂离子电导率

摘要 在LiI-MoS2 复合固体电解质中观察到锂离子电导率的增强，该复合固体电解质是通过球磨LiI 和MoS2 的混合物合成的。复合电解质在室温下显示出高达 7.1 × 10-5 S cm-1 的离子电导率，比原始 LiI 高近三个数量级，这可以归因于两相之间非晶界面的形成。此外，复合电解质 LiI-MoS2 表现出 -1 至 5 V 的宽表观电化学稳定性窗口。复合材料的 X 射线衍射测量表明，球磨过程后原始相保持良好。透射电子显微镜 (TEM) 和场发射扫描电子显微镜 (FE-SEM) 揭示了 LiI 在 MoS2 表面的均匀分布以及两相之间锂离子迁移的有利界面。我们的工作提出了一种设计具有高锂离子导电性的固体电解质的新策略，也为二维材料应用于优质固体电解质提供了一些可能性。