fig4

Figure 4. (A) Crystal structure of Li₂P₂S₆ and (B) reconstructed negative nuclear density map; (C) (left) Distorted LiS₆ octahedron and (right) edge-shared Li polyhedra along the b-axis in Li₂P₂S₆^[89]. Reproduced with permission^[89]. Copyright 2017, American Chemical Society; (D) Crystal structure of Li₄P₂S₆, projections along the a-, c-axis and perspective view emphasizing the P₂S₆^4- and LiS₆ units^[99]; (E) Diffusion pathways of Li₄P₂S₆ involving all three (upper) or two (middle) possible interstitial sites and vacancy-mediated diffusion (lower) between the lattice Li sites^[93]. Reproduced with permission^[93]. Copyright 2016, American Chemical Society; (F) Crystal structure of Li_4-2xZn_xP₂S₆, viewed along [100], [001] (g) Arrhenius plots of the ionic conductivities for the Li_4-2xZn_xP₂S₆ (0.25 ≤ x ≤ 1, nominal composition)^[100]. Reproduced with permission^[100]. Copyright 2023, Elsevier.