Abstract
This thesis work belongs to the actual industrial dynamic around all-solid-state batteries developpement. We aim, firstly, to replace the liquid electrolytes by solid one in conventional Li-ion batteries, and secondly, to use lithium metal as anode material for more volumetric and gravimetric energy density. For this purpose, the Li6PS5Cl compound was synthesised and used as solid electrolyte in dry-assembled batteries obtained by uniaxial compression of powders at room temperature. Scientific and technological issues were identified during this study : parasitic reactions between electrolyte and active material involving the protection of the latter by an inert coating, and/or the importance of pressure control during battery assembly and cycling. For a future industrial application, we tried to formulate our electrodes in wet/liquid process as the conventional Li-ion batteries. The suspension of particles in a solvent has shown its limits and we have chosen to dissolve the solid electrolyte in the mixing step. This study, widely discussed in the last part of the manuscript, aimed to properly disperse the electrolyte in the electrode composite, in addition to the coating of the active material's particles by the solid electrolyte, for better ionic percolation