ELECTROCHEMICAL PROPERTIES AND CYCLING PERFORMANCES OF COMPOSITE ELECTRODES IN SOLID-STATE LITHIUM BATTERIES

The construction of solid state batteries including a fast-ion-conducting electrolyte, insertion compounds and a lithium anode is discussed in this paper. The solid electrolyte is composed of a thin layer of vitreous B2O3-Li2O doped with lithium salts such as LiCl or Li2SO4. To overcome the principal difficulty which is identified as polarization loss, the positive electrode used is composite in form, including in suitable proportions the active material, the solid electrolyte and a small amount of polytetrafluoroethylene powder. The characteristics of composite-electrode cells are investigated for the systems Li-TiS2, Li-MoS2 and Li-NiPS3. The discharge curves are compared for different values of the current density. The cycling performances of solid state lithium batteries are reported in relation to the active material, and limitations are given for each case.