Half-Covered 'Glitter-Cake' AM@SE Composite: A Novel Electrode Design for High Energy Density All-Solid-State Batteries

• A novel 'glitter-cake' AM@SE composite design enables high volumetric energy density (1258 Wh L−1) at 85 wt% active material content in all-solid-state batteries. • The core–shell structure with a thin, conformal SE shell from mechanofusion ensures efficient ionic and electronic transport pathways. • Small SE particles act as fillers to reduce porosity, enhancing electrode density and interfacial contact. • The optimized electrode design outperforms reported ASSB cells, providing guidance for high-energy-density electrode engineering.