[en] All-solid-state Li-S batteries are fabricated with lithium silicide anodes (Li_4.4Si), sulfide-based glass electrolyte (Li₂S-P₂S₅), and sulfur composite (sulfur + acetylene black + solid electrolyte) cathode. Various preparation methods, such as mortar mixing (MM), ball milling (BM), and secondary ball milling (SBM), are applied for the sulfur composite cathode. By changing the preparation methods from MM to SBM, the electrode morphology and the electrolyte/cathode interfacial area are significantly improved, as confirmed with BET, SEM/EDS, and GITT analyses. These effects are reflected in the charge-discharge tests, resulting in higher capacity of the SBM cell. Pyrolytic graphite sheet (PGS) is employed for the gradient structure of the sulfur composite cathode, and the cell with PGS shows higher volumetric capacity and equivalent gravimetric capacity than do cells with the conventional cathode structure. This is because the cathode thickness is reduced and the electron transport to/from the current collector is facilitated. Thus, the present work indicates that design and preparation of the electrode greatly affects the performance of solid state batteries with sulfur composite cathodes. - Highlights: • All solid state batteries were fabricated with sulfur composite electrode. • Changing the preparation methods affected the electrode morphology. • The additional ball milling step is preferred for achieving higher performance. • The gradient structure was effective for increasing volumetric capacity. • Equivalent gravimetric capacity was achieved with the gradient structure.