The molding of the ceramic solid electrolyte sheet prepared by tape casting

Abstract

Abstract Ceramic oxide solid-state electrolytes are more popular among researchers because of their excellent thermal stability, wide electrochemical window, excellent lithium-ion conductivity and high elastic modulus. Lithium-ion solid-state batteries with tantalum-doped Li6.4La3Zr1.4Ta0.6O12 (LLZTO) inorganic ceramic electrolytes have attracted much attention due to their extraordinary lithium-ion conductivity, incombustibility, and wide electrochemical window. Tape casting is a common method for ceramic molding, which is mainly used to prepare ceramic packaging substrate. However, the preparation process of casting slurry is tedious and time-consuming. In this study, a one-step vibration ball-milling method was proposed to prepare a non-aqueous-based casting slurry, which only took 2 hours. By optimizing the process parameters, the LLZTO solid electrolyte film prepared by tape casting had a uniform texture, and its thickness could be as thin as several microns. The perovskite-type LLZTO-independent ceramic electrolyte film with a thickness of 83 μm was prepared by tape casting. The Li+ ionic conductivity of the LLZTO solid-state electrolyte membrane is 2.0×10−5 S·cm−1. The Li-symmetric battery with all-solid-state lithium assembled using 83 μm thick LLZTO exhibited stable Li deposition and stripping properties.