Lithium-containing thiophosphates represent promising ceramic electrolytes for all-solid-state batteries. The underlying principles that cause high Li⁺ diffusivity are, however, still incompletely understood. Here, β-Li₃PS₄ served as a model compound to test the recently presented hypothesis that a channel-like Li⁺ diffusion pathway influences ionic transport in its 3D network of the LiS₄, LiS₆, and PS₄ polyhedra. We looked at the temperature dependence of diffusion-induced ⁷Li nuclear spin–lattice relaxation rates to check whether they reveal any diagnostic differences as compared to the nuclear spin response frequently found for isotropic (3D) diffusion. Indeed, distinct anomalies show up that can be understood if we consider the influence of low-dimensional diffusion. Hence, even for isotropic materials without clearly recognizable 1D or 2D diffusion pathways, such as layered or channel-structured materials, structurally hidden dimensionality effects might help explain high ionic conductivities and refine the design principles currently discussed. In the present case, such rapid pathways assist the ions to move through the crystal structure.

中文翻译：

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在纳米核自旋弛豫β-李₃ PS ₄揭示低维力扩散的各向同性基体

含锂的硫代磷酸盐代表了用于全固态电池的有前途的陶瓷电解质。然而，导致Li ⁺扩散率高的基本原理仍未完全理解。这里，β-栗₃ PS ₄用作模型化合物以测试最近提出的假设，即一个信道类锂⁺的LIS其3D网络中的扩散路径的影响离子传输₄，LIS ₆和PS ₄多面体。我们研究了扩散诱导的温度对温度的依赖性⁷Li核自旋-晶格弛豫率用于检查它们是否与常用于各向同性（3D）扩散的核自旋响应相比揭示出任何诊断差异。确实，如果我们考虑低维扩散的影响，就会出现明显的异常现象，这是可以理解的。因此，即使对于没有清晰识别的1D或2D扩散路径的各向同性材料（例如层状或通道结构的材料），结构上隐藏的尺寸效应也可能有助于解释高离子电导率并改善当前讨论的设计原理。在当前情况下，这种快速路径有助于离子移动通过晶体结构。