Lithium ion conducting argyrodites have received growing attention as solid electrolytes for all-solid-state-batteries (ASSBs). The search for a novel lithium-argyrodite solid electrolyte was conducted in the Li₂S–SnS₂–SiS₂–P₂S₅ quasi-quaternary system. A systematic synthesis of Li_7+δ[Sn_kSi_1−k]_3+δ′P_1−δ′′S₁₂ (0.425 ≤ k ≤ 0.525) revealed a monophasic composition Li_6.96Sn_1.55Si_1.71P_0.8S₁₂ with a cubic argyrodite phase. In the argyrodite structure, Li is partially substituted by the smaller Sn and Si ions, which differs from the majority of argyrodite-type lithium ion conductors reported to date. The introduction of Si⁴⁺ and Sn⁴⁺ provided a cubic phase, and suppressed the undesirable phase transition to the low-conductive orthorhombic phase, which occurs in the original cubic Li–P–S argyrodite at ambient temperature. Li_6.96Sn_1.55Si_1.71P_0.8S₁₂ shows ionic conductivities of 8.5 × 10⁻⁵ S cm⁻¹ at 298 K and 1.3 × 10⁻³ S cm⁻¹ at 373 K with an activation energy of 34 kJ mol⁻¹, enabling cycling in an all-solid-state lithium cell when this material is employed as a solid electrolyte.

锂离子传导性银辉石作为全固态电池（ASSB）的固体电解质越来越受到关注。在Li ₂ S–SnS ₂ –SiS ₂ –P ₂ S ₅准四元体系中寻找一种新型的锂-香精锂固体电解质。李的系统性合成_{7+ δ} [Sn的_ķ的Si _{1- ķ} ] _{3+ δ '} P _{1 - δ ''} š ₁₂（0.425≤  ķ  ≤0.525）揭示了单相组成为Li _6.96的Sn _1.55的Si_1.71 P _0.8 S ₁₂，具有立方银辉石相。在青菱石结构中，Li被较小的Sn和Si离子部分取代，这与迄今报道的大多数绿泥石型锂离子导体不同。Si ⁴⁺和Sn ⁴⁺的引入提供了立方相，并抑制了向低导电正交晶相的不希望有的相变，这种相变发生在原始的室温Li-P-S菱镁矿中。Li _6.96 Sn _1.55 Si _1.71 P _0.8 S ₁₂在298 K和1.3×10下显示的离子电导率为8.5×10 ^-5  S cm ^-1373 K时为^-3  S cm ^-1，活化能为34 kJ mol ^-1，当该材料用作固体电解质时，可以在全固态锂电池中循环。