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.