Study of transport and structural properties of garnet structured Ce3+ doped Li7La3Zr2O12 electrolyte by solid state reaction method

Abstract

Cubic Li7La3Zr2O12 garnet electrolyte is the most studied solid electrolyte material due to its high ionic conductivity (10-4 S/cm) and large electrochemical stability window. It is difficult to stabilize the cubic phase of Li7La3Zr2O12 at room temperature without any doping element. Doping of different supervalent cations at the lithium and zirconium sites to stabilize the cubic phase of Li7La3Zr2O12 electrolyte has been studied by different research groups. In the present study Ce3+ substituted Li7La3Zr2O12 has been prepared by solid state reaction method in different compositions. The structural and transport properties of as prepared electrolyte have been studied by powder XRD and AC impedance spectroscopy. The conductivity values obtained for Ce3+ doped Li7La3Zr2O12are considerably low as compared to pure cubic Li7La3Zr2O12 electrolyte which may be due to the lower ionic radii of cerium as compared to lanthanum.