Synthesis of Lithium Garnet Oxides of the Compositions Series Li_7-xLa₃Zr_2-xTa_xO₁₂

王治安¹，MO Jun²，WU Yuping^3,4，叶红齐¹，WU Xiongwei^1,2

1. Department of Chemistry and Chemical Engineering, Central South University2. College of Science,National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanica, College of Agronomy, Hunan Agricultural University3. New Energy and Materials Laboratory (NEML), Department of Chemistry & Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University4. College of Energy, Nanjing University of Technology

摘 要：In order to obtain a safe,reliable,long-lived battery system without use of flammable,volatile,and relatively unstable organic liquid-based electrolytes,lithium garnet oxides with formulas Li_7-xLa₃Zr_2-xTa_xO₁₂（x=0.2-1）were synthesized by the solid state reaction method.Single cubic phases were observed in the composition x range between 0.2 and 1.The lattice parameters decreased with the addition of Ta due to the smaller ionic radius of Ta⁵⁺compared with that of Zr⁴⁺,following the Vegard’s law.The total conductivity of the x=0.3 composition is 6.03×10^-5 S·cm^-1at room temperature with an activation energy of 0.30 eV.These lithium garnet oxides exhibit lithium ionic transport that is relevant to lithium battery application.

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