Recently, Xiaomi Auto's patent titled "Solid-State Battery Composite Electrode, Preparation Method Thereof, and Solid-State Battery Including the Same" has been officially announced. The patent involves a solid-state battery composite electrode and its preparation method. According to the patent abstract, the patent pertains to a solid-state battery composite electrode and its preparation method. The composite electrode consists of a current collector and an electrode material layer, with the electrode material layer stacked along the thickness direction of the current collector. The electrode material layer comprises a matrix and a solid-state electrolyte, with the solid-state electrolyte extending through the entire electrode material layer along the thickness direction of the current collector. The matrix is composed of electrode active material, conductive agent, and adhesive, while the solid-state electrolyte contains polymers and metal salts.