Journal of Industrial and Engineering Chemistry, Vol.36, 279-283, April, 2016
Cubic phase behavior and lithium ion conductivity of Li7La3Zr2O12 prepared by co-precipitation synthesis for all-solid batteries
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Li7La3Zr2O12 powders with cubic phase and high ionic conductivity were synthesized using co-precipitation process, in which the mixture precursors of La-Zr-(OH)x and Li source were calcined and sintered at different conditions. XRD analysis showed that cubic phase of garnet-type LLZO powder is formed as calcined at 700 and 800 °C, respectively. However, tetragonal phase is formed at above 900 °C. As these samples were sintered in the form of pellets at 1200 °C, LLZO powder calcined at 700 °C showed excellent ionic conductivity of 3.2 × 10-4 S cm-1 at 25 °C, indicating cubic structure of LLZO single phase and high relative density of above 90% that is different with LLZO powder calcined at 900 °C.
Keywords:All-solid battery;Co-precipitation synthesis;Garnet-like structure;Cubic phase;Ionic conductivity
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