Abstract
All-solid-state rechargeable lithium batteries are attracting much attention because of their high safety without leakage and flammability, long cycle lives, possible use of high-capacity electrode and versatile geometries. Development of solid electrolytes suitable for the batteries and formation of favorable electrode-electrolyte solid interfaces are keys to realize bulk-type all-solid-state batteries. Sulfide electrolytes in the system Li2S-P2S5 have advantages of high conductivity, wide electrochemical window, good formability and appropriate elastic property. Sulfide electrolyte thin films were coated on LiCoO2 electrode particles by pulsed laser deposition and liquid-phase techniques. These techniques are effective in forming good electrode-electrolyte contacts and increasing amounts of LiCoO2 in a positive electrode layer. All-solid-state In/Li2S-P2S5/LiCoO2 batteries using the electrolyte-coated LiCoO2 operated as lithium secondary batteries at 25ºC.
