Fast Lithium-Ion Conducting Glass- Ceramics in the System Li_2S-SiS_2-P_2S_5

摘要

Novel glass-ceramics solid electrolytes were prepared from mechanically milled glassy powders in the ternary system Li_2S-SiS_2-P_2S_5. With an increase in the heat-treatment temperature, an ambient temperature conductivity of the obtained glass-ceramics reached 1.2 X 10~(-3) S cm~(-1), which is higher than the maximum conductivity of the solid solutions in the system Li_4SiS_4-Li_3PS_4. The enhancement on conductivity by heat-treatment over the crystallization temperature is due to the formation of the highly conductive crystalline phase with the same superlattice structure as the thin-LISICON phase of Li_(4-x)Ge_(1x)P_xS_4 (0.6 < x < 0.8) showing high conductivities over 10~(-3) S cm~(-1) at room temperature.