High lithium ionic conductivity in the garnet‐type oxide Li7−2xLa3Zr2−xMoxO12 (x=0‐0.3) ceramics by sol‐gel method

Abstract Lithium garnet‐type oxides Li 7−2 x La 3 Zr 2− x M o x O 12 ( x =0, 0.1, 0.2, 0.3) ceramics were prepared by a sol‐gel method. The influence of molybdenum on the structure, microstructure and conductivity of Li 7 La 3 Zr 2 O 12 were investigated by X‐ray diffraction, scanning electron microscopy, and impedance spectroscopy. The cubic phase Li 7 La 3 Zr 2 O 12 has been stabilized by partial substitution of Mo for Zr at low temperature. The introduction of Mo ( x ≥0.1) can accelerate densification. Li 6.6 La 3 Zr 1.8 Mo 0.2 O 12 sintered at lower temperature 1100°C for 3 hours exhibits highest total ionic conductivity of 5.09 × 10 −4 S/cm. Results indicate that the Mo doping LLZO synthesized by sol‐gel method effectively lowers its sintering temperature and improves the ionic conductivity.