CHARACTERISTICS OF LITHIUM LANTHANUM TITANATE THIN FILMS MADE BY ELECTRON BEAM EVAPORATION FROM NANOSTRUCTURED La0.67-xLi 3xTiO3 TARGET

Abstract

Bulk nanostructured perovskites of La 0.67-x Li 3x TiO 3 (LLTO) were prepared by using thermally ball-grinding from compounds of La 2 O 3 , Li 2 CO 3 and TiO 2 . From XRD analysis, it was found that LTTO materials were crystallized with nano-size grains of an average size of 30 nm. The bulk ionic conductivity was found strongly dependent on the Li + composition, the samples with x = 0.11 (corresponding to a La 0.56 Li 0.33 TiO 3 compound) have the best ionic conductivity, which is ca. 3.2 x 10 -3 S/cm at room temperature. The LLTO amorphous films were made by electron beam deposition. At room temperature the smooth films have ionic conductivity of 3.5 x 10 -5 S/cm and transmittance of 80%. The optical bandgap of the films was found to be of 2.3 eV. The results have shown that the perovskite La 0.56 Li 0.33 TiO 3 thin films can be used for a transparent solid electrolyte in ionic battery and in all-solid-state electrochromic devices, in particular.

Perovskite Solid-State Electrolytes for Lithium Metal Batteries

“…Epitaxial growth of LLTO thin films on single crystal substrates prepared by e-beam evaporation results in uniform LLTO grains without obvious pinholes or cracks [93]. The orientational growth of LLTO thin films significantly affects the size of the LLTO lattices.…”