Synthesis, structure, and electrochemical properties of crystalline Li–P–S–O solid electrolytes: Novel lithium-conducting oxysulfides of Li10GeP2S12 family
作者： Kota Suzuki , Masamitsu Sakuma , Satoshi Hori , Tetsuya Nakazawa , Miki Nagao
DOI: 10.1016/J.SSI.2016.02.002
关键词: Crystal structure 、 Isostructural 、 Chemistry 、 Electrochemical window 、 Lithium 、 Mineralogy 、 Ionic bonding 、 Ternary operation 、 Solid solution 、 Crystallography 、 Fast ion conductor
摘要: Abstract Novel lithium-ion (Li+)-conducting oxysulfides of the Li10GeP2S12 family were found in ternary Li2S–P2S5–P2O5 system; Li10GeP2S12-type solid solutions with compositions Li3 + 5xP1 − xS4 − zOz (x = 0.03–0.08, z = 0.4–0.8) confirmed. The showed ionic conductivities from 4.14 × 10− 5 to 2.64 × 10− 4 S cm− 1 at 298 K and a wide electrochemical window 0–5.0 V (vs. Li/Li+). Among synthesized, purest phase had composition Li3.35P0.93S3.5O0.5 (x = 0.07, z = 0.5). Structural analysis revealed that novel are isostructural original structure (P/□)(S/O)4 tetrahedra, which indicates presence cation defects oxygen substitution crystal structure. Electrochemical stability was confirmed voltage range 0–5.0 V. solid-electrolyte interphase (SEI) resistivity its cycle-dependence evaluation for new materials demonstrated lower resistivities furnished well-contacted SEI layers during charge–discharge process.
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