All-solid state All-solid state battery All-solid-state battery Covalent bonds Electrode active materials Electrodes High safety Higher energy density Layered semiconductors Mechanochemical synthesis Molybdenum compounds Molybdenum sulfide Positive electrode Positive electrodes Sodium Sodium battery Sodium compounds Sodium secondary batteries Solid electrolytes Solid-State Batteries Solid-state cells Sulfur compounds X ray photoelectron spectroscopy