Invited Paper: Recent Development of Bulk-Type Solid-State Rechargeable Lithium Batteries with Sulfide Glass-ceramic Electrolytes

The recent development of bulk-type solid-state rechargeable lithium batteries with sulfide glass-ceramics as a solid electrolyte was reviewed. Sulfide glasses and glass-ceramics in the system Li2S-P(2)S(5)have an advantage of high conductivity, wide electrochemical window and low grain-boundary resistance. Bulk-type solid-state batteries composed of compressed powder layers of electrode and electrolyte were fabricated with Li2S-P2S5 glass-ceramic electrolytes. Formation of a favorable solid-solid interface between electrode and electrolyte is a key to achieving excellent performance in solid-state batteries. The mechanochemical preparation of nanocomposite electrodes and surface modification of active materials by softening of the electrolyte, or PLD coating, were useful for increasing the electrode-electrolyte contact area and improving battery performance.