SOLID-STATE ELECTROLYTE AND METHOD OF MANUFACTURE THEREOF

A method of manufacturing a solid-state electrolyte including: providing a solvent; dissolving a precursor compound including lithium, a precursor compound including lanthanum, and a precursor compound including zirconium in the solvent to provide a precursor composition, wherein a content of lithium in the precursor composition is greater than a stoichiometric amount; spraying the precursor composition onto a heated substrate to form a film; and heat-treating the film at 300° C. to 800° C. to manufacture the solid state electrolyte, wherein the solid-state electrolyte includes LiAlLaZrOwherein 0≤x≤1, and wherein the solid state electrolyte is in a form a film having a thickness of 5 nanometers to 1000 micrometers.