Sulfide-based solid electrolytes exhibit high ionic conductivities of more than 10⁻⁴ S cm⁻¹ at room temperature. However, sulfide electrolytes have a major disadvantage because they are hygroscopic. To reduce costs and develop practical all-solid-state batteries, it is imperative to enhance their chemical stability in air. In this study, Li₂O is added to 75Li₂S·25P₂S₅ glasses to improve their chemical stability to moisture in air, and (75 − x)Li₂S·25P₂S₅·xLi₂O samples are synthesized. The effects of the addition of Li₂O on the electrical properties and thermal behavior of 75Li₂S·25P₂S₅ glasses are examined. With an increase in the Li₂O content, the crystallization temperature of 75Li₂S·25P₂S₅ glasses shifts to the high-temperature side, and the glass phase stabilizes over a wide temperature range. Specifically, the substitution of Li₂O with Li₂S enhances the thermal stability of glasses. This is attributed to the change in the precipitated crystalline phase, β-Li₃PS₄ (x = 0, 5) → thio-LISICON III Li_3.2P_0.96S₄ (x = 10, 15). In addition, the (75 − x)Li₂S·25P₂S₅·xLi₂O glass ceramics for x = 15 exhibit higher conductivity than pristine glasses because of the thio-LISICON III Li_3.2P_0.96S₄ crystalline phase. Thus, the addition of more than 10 mol% of Li₂O ensures a good balance between thermal stability, atmospheric stability, and conductivity.

硫化物基固体电解质在室温下表现出大于10 ^-4  S cm ^-1的高离子电导率。然而，硫化物电解质由于具有吸湿性而具有主要缺点。为了降低成本并开发实用的全固态电池，必须提高其在空气中的化学稳定性。在这项研究中，将Li ₂ O添加到75Li ₂ S·25P ₂ S ₅玻璃中以提高其对空气中水分的化学稳定性，并且（75-  x）Li ₂ S·25P ₂ S ₅ · x Li ₂ O样品为合成的。锂添加的影响_研究了2 O对75Li ₂ S·25P ₂ S ₅玻璃的电性能和热行为的影响。随着Li ₂ O含量的增加，75Li ₂ S·25P ₂ S ₅玻璃的结晶温度移向高温侧，并且玻璃相在较宽的温度范围内稳定。具体地，用Li ₂ S代替Li ₂ O增强了玻璃的热稳定性。这归因于该变化在沉淀的结晶相，β -Li ₃ PS ₄（X  = 0,5）→硫代LISICON III栗_3.2 P _0.96 S ₄（x  = 10，15）。另外，x  ＝ 15的（75-  x）Li ₂ S·25P ₂ S ₅ · x Li ₂ O玻璃陶瓷由于硫代-LISICON III Li _3.2 P _0.96 S ₄结晶相而显示出比原始玻璃更高的电导率。因此，添加超过10mol％的Li ₂ O确保了热稳定性，大气稳定性和电导率之间的良好平衡。