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Abstract: An attempt has been made in this work to increase the bulk and total conductivity of Li7La3Zr2O12 (LLZ) with partial substitution of trivalent Y for a tetravalent Zr using yttria-stabilized ZrO2 (3% YSZ) as reactant. The small doping of Y for Zr helps to increase the bulk and total conductivity to 9.56×10−4 and 8.10×10−4 Scm −1, respectively, at 25°C. The presence of small amount of Y helped to get well sintered pellet relatively at lower temperature with lower sintering time compared to LLZ, which helps to improve the overall conductivity. [Copyright &y& Elsevier]

Abstract: 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-x La3Sn2-x Nb x O12 (x =0–1) were prepared through solid state reaction method. Li7-x La3Sn2-x Nb x O12 with x ≥0.25 stabilizes in cubic structure at sintering temperature around 950°C. [Copyright &y& Elsevier]