I4̅-type LiZnPS₄ solid electrolyte was synthesized starting from Li₂S, P₂S₅, and ZnS, and its room temperature ionic conductivity, σ_25°C, was ∼10^–8 S/cm. To improve σ_25°C, compositions of Li_1+2xZn_1–xPS₄ (x = 0.125, 0.25, 0.375, 0.5, 0.625, 0.75, 0.8, 0.9) were synthesized from mixtures of LiZnPS₄ and amorphous Li₃PS₄ (a-LPS). The samples with x ≤ 0.8 were confirmed by means of XRD and Raman spectroscopy to have the I4̅ structure. The maximum σ_25°C was 5.7 × 10^–4 S/cm at x = 0.625. NMR measurement revealed that Li_1+2xZn_1–xPS₄ (x ≤ 0.625) is almost a single phase material and not a simple mixture of LiZnPS₄ and a-LPS, confirming that its crystal structure is responsible for the improved ionic conductivity. Li_2.25Zn_0.375PS₄ (x = 0.625) was reactive to graphite and indium anodes but stable against a Li₄Ti₅O₁₂ anode and a 4 V class cathode. We fabricated an all-solid-state battery in the form of graphite|a-LPS|Li_2.25Zn_0.375PS₄|Li₂O-ZrO₂ coated Li(Ni, Mn, Co)O₂ and examined its performance. It showed a first-cycle discharge capacity of ∼144 mAh/g_–NMC with a capacity retention of 83% after 100 cycles.

中文翻译：

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合成及电化学性质我4-类型Li _{1 + 2 X}的Zn _{1- X} PS ₄固体电解质

我4型LiZnPS ₄固体电解质合成选自Li开始₂ S，P ₂小号₅，和ZnS，和其室温的离子电导率，σ _25℃，〜10是^-8 S /厘米。为了提高σ25 _°C，由LiZnPS ₄和无定形Li _3的混合物合成了Li _{1 + 2 x} Zn _{1- x} PS ₄（x = 0.125，0.25，0.375，0.5，0.625，0.75，0.8，0.9）的组成PS ₄（a-LPS）。带x的样本≤0.8通过XRD和拉曼的手段确认光谱分析具有我4结构。x = 0.625时，最大σ25 _°C为5.7×10 ^–4 S / cm 。NMR测定结果表明，李_{1 + 2 X}的Zn _{1- X} PS ₄（X ≤0.625）几乎是单相材料和LiZnPS的不是一个简单的混合物₄和-LPS，确认其结晶结构是负责改进的离子电导率。Li _2.25 Zn _0.375 PS ₄（x = 0.625）对石墨和铟阳极具有反应性，但对Li ₄稳定Ti ₅ O ₁₂阳极和4 V级阴极。我们以石墨| a-LPS | Li _2.25 Zn _0.375 PS ₄ | Li ₂ O-ZrO ₂涂覆的Li（Ni，Mn，Co）O ₂的形式制造了全固态电池，并研究了其性能。它显示出约144 mAh / g _–NMC的第一循环放电容量，经过100次循环后的容量保持率为83％。