This product is a LATP solid electrolyte oil-based slurry with a solid content of 20% and an average particle size of 300 nm, designed for the fabrication of composite solid electrolytes or protective coatings in advanced lithium battery research. The oil-based formulation offers compatibility with non-polar solvents and hydrophobic binders, facilitating uniform deposition in tape-casting, screen-printing, or spin-coating processes. With a consistent particle size distribution and pre-dispersed state, it enables reproducible ionic conductivity measurements and stable electrode–electrolyte interfaces. Prior to use, gentle dispersion and stirring are recommended to ensure optimal uniformity. Supplied in 20 kg containers with a two-week delivery lead time, this slurry is suitable for scalable solid-state battery development and fundamental studies on oxide electrolyte integration.