All-solid-state batteries (ASSBs) have high safety and high energy density. Li₁₀SnP₂S₁₂ sulfide solid electrolyte has attracted extensive attention due to its low fabrication cost and outstanding performance in ASSBs. However, its ionic conductivity and stability to lithium and air need to be further improved. Here, in order to avoid the formation of impurities related to Sn-related compounds, the content of SnS₂ in the raw materials is reduced, and to improve ionic conductivity and stability to lithium and air. The S site is doped with O by the solid-phase sintering method, and a series of Li₁₀Sn_0.95P₂S_11.9−xO_x (0 ≤x ≤ 1) electrolytes are prepared. Li₁₀Sn_0.95P₂S_11.4O_0.5 (LS_0.95PSO_0.5) has a high ionic conductivity of 3.96 mS cm⁻¹ and low activation energy after cold pressing. According to the Hard-Soft-Acid-Base theory, doping O into the electrolyte in advance will improve the stability. The ionic conductivity decay of LS_0.95PSO_0.5 after exposure to air is smaller, which proves that O doping improves the air stability of the electrolyte. LS_0.95PSO_0.5 also shows good stability to lithium. The assembled LNO@LCO/LS_0.95PSO_0.5/Li-In ASSB exhibits a high first-cycle discharge capacity of 133 mA h g⁻¹ and good cycling stability.

全固态电池（ASSB）具有高安全性和高能量密度。Li ₁₀ SnP ₂ S ₁₂硫化物固体电解质由于其较低的制造成本和在ASSBs中的优异性能而受到广泛关注。但其离子电导率和对锂和空气的稳定性有待进一步提高。这里，为了避免与Sn相关化合物相关的杂质的形成，降低原料中SnS _{2的含量，并提高离子电导率和对锂和空气的稳定性。}S位通过固相烧结法掺杂O，一系列Li ₁₀ Sn _0.95 P ₂ S _11.9-x O _x(0≤x≤1)电解质制备。Li ₁₀ Sn _0.95 P ₂ S _11.4 O _0.5 (LS _0.95 PSO _0.5 )具有3.96 mS cm ^-1的高离子电导率和冷压后的低活化能。根据硬-软-酸-碱理论，提前将O掺杂到电解液中会提高稳定性。_{LS 0.95} PSO _0.5暴露于空气后的离子电导率衰减更小，证明O掺杂提高了电解液的空气稳定性。LS _0.95 PSO _0.5对锂也表现出良好的稳定性。组装好的 LNO@LCO/LS _0.95PSO _0.5 /Li-In ASSB 具有 133 mAh g ^-1的高首循环放电容量和良好的循环稳定性。