Li<bold>3</bold>PO<bold>4</bold> Coated Li[Ni<bold>0.75</bold>Co<bold>0.1</bold>Mn<bold>0.15</bold>]O<bold>2</bold> Cathode for All-Solid-State Batteries Based on Sulfide Electrolyte

Surface coating of cathodes is an essential process for all-solid-state batteries (ASSBs) based on sulfide electrolytes as it efficiently suppresses interfacial reactions between oxide and electrolytes. Based computational calculations, Li3PO4 has been suggested a promising material because its higher stability with sulfides optimal ionic conductivity. However, hardly applied to the ASSBs due absence suitable process, including selection source that compatible ASSBs. In this study, polyphosphoric acid (PPA) (NH4)2HPO4 were used materials preparing ASSBs, properties layer coated compared. The fabricated using was rough inhomogeneous, which not protection cathodes. Moreover, water-based solution can deteriorate electrochemical performance high-Ni are vulnerable water. contrast, when alcohol-based solvent used, PPA enabled formation thin homogeneous cathode surface. As consequence, containing Li3PO4-coated prepared by exhibited significantly enhanced discharge rate capabilities compared pristine or source.