Fabrication and All Solid-State Battery Performance of TiS₂/Li₁₀GeP₂S₁₂ Composite Electrodes

Abstract

TiS₂/Li₁₀GeP₂S₁₂ composite electrodes were fabricated using a mill pot rotator, and their electrochemical properties were investigated in all solid-state batteries of TiS₂ cathode/Li₁₀GeP₂S₁₂ solid-electrolyte/In-Li anode. The batteries compressed under a pressure of 19 MPa demonstrated poor cycle stability and rate capability because of the deterioration of physical contact between the TiS₂ and the Li₁₀GeP₂S₁₂. The battery performance was considerably improved by applying a pressure of 228 MPa throughout the electrochemical cycling while maintaining the contact area. The battery delivered the reversible a capacity of over 160 mAh･g⁻¹ under 1 C operation with high capacity retention.