Electrochemical Properties of Composite Cathode Using Bimodal Sized Electrolyte for All-Solid-State Batteries

To enhance the packing density of composite cathode for all-solid-state lithium-ion batteries, the effect of a bimodal sized solid electrolyte was studied. The composite cathode, which is fabricated using the powder compression method, consisted of the cathode active material, a conductive agent, and the solid electrolyte. However, the composite cathode construction had voids. The voids in the composite cathode were restricted to ionic conduction between the cathode active materials and the solid electrolytes. Suppression of the voids in the composite cathode improved the electrochemical performance of the all-solid-state battery. A composite cathode using bimodal sized electrolyte powders demonstrated better cell performance than that using only fine or coarse sized electrolyte powders. These results demonstrated that the composite cathode using the bimodal sized electrolyte enhanced the electrochemical performance of the all-solid-state battery because it improved the packing density of the cathode.