Use of Polyvinylpyrrolidone as a Chelating Agent to Reduce the Calcination Temperature of Li₇La₃Zr₂O₁₂ Synthesized by Using Solution-based Method

In general, several calcination steps and long sintering times at temperatures greater than 1000 - 1200 ◦ C are typically needed in order to achieve the more cubic structure. In this study, using polyvinylpyrrolidone as a chelating agent, cubic Li7La3Zr2O12 was synthesized at a low temperature of 900 ◦ C by using a solution-based method. The resulting cubic phase contained a small amount of the pyrochlore phase, and the lithium-ion conductivity, as determined by using electrochemical impedance spectroscopy, was 1.09 × 10 −6 S/cm at 25 ◦ C.