Abstract
A cubic Li5La3Nb2O12 phase with a garnet framework was synthesized by the sol–gel process, in which lithium hydroxide, niobium oxide and acetic lanthanum were used as starting materials, while water was used as solvent. Pure garnet-like Li5La3Nb2O12 powders were obtained after heating the gel precursor at 700 °C for 6 h with 10 % excess lithium salt. The calcination temperature is nearly 250 °C lower than that by the solid state reaction. The phase transforms from cubic to tetragonal symmetry with loss of lithium at 717 °C, but the garnet framework remains stable to above 900 °C. A pellet annealed at 900 °C for 6 h had a room-temperature Li+-ion conductivity σLi (22 °C) = 1.0 × 10−5 S cm−1, a little higher than that attained by solid-state synthesis. The Li5La3Nb2O12 compound was chemically stable against two commonly used cathode materials, LiMn2O4 and LiCoO2, up to 900 °C and against metallic lithium.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (50954006), the Hunan Science and Technology Department (2009GK3152), the Hunan Provincial Construction Department (201012) and the Changsha Science and Technology Department (K1003048-11).
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Peng, H., Wu, Q. & Xiao, L. Low temperature synthesis of Li5La3Nb2O12 with cubic garnet-type structure by sol–gel process. J Sol-Gel Sci Technol 66, 175–179 (2013). https://doi.org/10.1007/s10971-013-2984-y
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DOI: https://doi.org/10.1007/s10971-013-2984-y