Li7-xLa3Sn2-xNbxO12 (x=0.25-1) cubic lithium garnet

The great demand for batteries with high power and energy densities promotes active research on lithium garnets for advanced safe lithium ion battery technologies. Lithium garnets Li7La3M2O12 (M = Zr, Hf) in cubic phase exhibits two orders of higher conductivity compared to their tetragonal phase. Earlier efforts to stabilize related Li7La3Sn2O12 in cubic phase by solid state method was unsuccessful. In this work, an attempt has been made to synthesise Sn-based lithium garnets in cubic phase. The addition of Al2O3 chemically did not help to stabilize Li7La3Sn2O12 in cubic phase through solid state method. Sn-based lithium garnets Li7-xLa3Sn2-xNbxO12 (x = 0-1) were prepared through solid state reaction method. Li7-xLa3Sn2-xNbxO12 with x >= 0.25 stabilizes in cubic structure at sintering temperature around 950 degrees C. (C) 2012 Elsevier B.V. All rights reserved.