High Ionic Conductivity Lithium Garnet Oxides of Li7−xLa3Zr2−xTaxO12 Compositions

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Lithium garnet oxides of the composition series Li 7− x La 3 Zr 2− x Ta x O 12 ( x = 0−2) were synthesized by the solid state reaction and characterized by the powder X-ray diffraction and the impedance spectroscopy. Single cubic phases were obtained between x = 0.2 and 2, while the end-member Li 7 La 3 Zr 2 O 12 exhibited a tetragonal phase. The lattice parameters of the cubic series followed the Vegard's law. The maximum bulk (9.6 × 10 −4 S/cm) and total (6.9 × 10 −4 S/cm) conductivities were achieved at x = 0.3 and x = 0.2, respectively at room temperature. Electrochemical tests with a hybrid solid|liquid electrolyte configuration were performed to evaluate the electrochemical performance of the solid electrolytes.