Structure of the Solid-State Electrolyte Li3+2x P1–x Al x S4: Lithium-Ion Transport Properties in Crystalline vs Glassy Phases

The search for new solid electrolyte materials and an understanding of fast-ion conductivity are crucial for the development of safe and high-power all-solid-state battery technology. Herein, we present the synthesis, structure, and properties of a crystalline lithium-ion conductor, Li_3.3Al_0.15P_0.85S₄ (i.e., Li_9.9Al_0.45P_2.55S₁₂), found in the compositional range Li_3+2xP_1-xAl_xS₄ (x = 0.15, 0.20, and 0.33). ³¹P magic-angle spinning nuclear …