LITHIUM-ION CONDUCTOR, LITHIUM BATTERY INCLUDING THE SAME, AND METHOD OF PREPARING LITHIUM-ION CONDUCTOR

A lithium-ion conductor and an all-solid-state battery including the lithium-ion conductor. The lithium-ion conductor including: a first compound represented by Formula 1; and a second compound represented by Formula 2, wherein the lithium-ion conductor has a first peak at a diffraction angle (2θ) of 23.8° to 24.5° in an X-ray diffraction spectrum: wherein Formula 1 and Formula 2 are as described herein.