Fabrication and electrochemical properties of Li₄Ti₅O₁₂@Li₆PS₅Cl for all-solid-state lithium batteries using simple mechanical method

Li₆PS₅Cl-coated Li₄Ti₅O₁₂ materials was fabricated by a simple liquid-phase treatment method. Charge-discharge tests show that Li₆PS₅Cl-coated Li₄Ti₅O₁₂ (LTO@LPSCl)/Li₆PS₅Cl/Li all-solid-state lithium batteries exhibit high reversible capacity (~158 mA h·g^-1) after 250 cycles under 0.05 C and excellent rate capacity (~50 mA h·g^-1) under 1 C at 80 °C. A combination of scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) mapping, and electrochemical impedance spectra (EIS) reveals that good wettability of liquid with Li₄Ti₅O₁₂ materials and Li₆PS₅Cl is responsible for Li₆PS₅Cl nanoparticle coated on the surface of Li₄Ti₅O₁₂ materials homogenously, which build the stable interface between active materials and solid state electrolyte, reduce the interface resistance effectively, and result in excellent electrochemical performances.