In this study, amorphous lithium thio-germanate thin-films were prepared as electrolytes for solid-state
lithium rechargeable batteries by using RF sputtering deposition in an Ar atmospheres. High quality
lithium germanium sulfide, nLi2S þ GeS2(n ¼ 1, 2, and 3) thin-films have been successfully made by RF
sputtering and synthesized as solid-state electrolytes. Although these materials are unstable in air the
thin-films were thoroughly characterized by X-ray diffraction (XRD), Scanning electron spectroscopy
(SEM), Raman spectroscopy, Infrared spectroscopy (IR), and impedance spectroscopy using special setups
to prevent contamination. The ionic conductivities of the thin-films are ~3 order magnitude higher than
reported values for oxide thin-films. In this way, this work may provide a new way for developing new
thin-film electrolytes for solid-state lithium ion batteries.