Studies of argyrodite Li₆PS₅Cl as solid electrolyte are increasing, motivated by its high ionic conductivity and its easy processability. However, development of All-Solid-State-Batteries lies on the ability to produce such compound with a good purity. This work presents the characterization results of different argyrodite grades: commercial and homemade one. In parallel, synthesis of Li₆PS₅Cl from Li₄P₂S₇ precursor is reported for the first time. The purity effect on these properties will be explored by using X-ray diffraction coupled with Raman spectroscopy and electrochemical impedance spectroscopy techniques. Crystal properties investigations will be particularly conducted, given that smaller crystallite sizes would lead to an enhanced ionic percolation network by increasing the microstructure homogeneity in catholyte. Such SE could be obtained only by avoiding a post synthesis annealing treatment. Finally, electrochemical properties of the different reported grades will also be discussed in this study. We demonstrate here 1. the beneficial effect of Li₄P₂S₇ to obtain a pure sulfur-based solid electrolyte with nanometric crystallites without solid state synthesis and 2. the impact of impurities on its ionics and electrochemical properties.

由于其高离子电导率和易加工性，对作为固体电解质的 Argyrodite Li ₆ PS ₅ Cl 的研究正在增加。然而，全固态电池的发展依赖于生产具有良好纯度的这种化合物的能力。这项工作展示了不同银锭的表征结果：商业和自制的。同时，从 Li ₄ P ₂ S ₇合成 Li ₆ PS ₅ Cl前体首次报道。将通过使用 X 射线衍射结合拉曼光谱和电化学阻抗光谱技术来探索纯度对这些特性的影响。考虑到较小的微晶尺寸会通过增加阴极电解液中的微观结构均匀性而导致增强的离子渗透网络，因此将特别进行晶体特性研究。例如SE只能通过避免获得交合成退火处理。最后，本研究还将讨论不同报告等级的电化学性能。我们在此证明 1. Li ₄ P ₂ S ₇的有益效果 获得具有纳米微晶的纯硫基固体电解质，无需固态合成和 2. 杂质对其离子和电化学性能的影响。