Co-precipitation synthesis and electrochemical properties of NASICON-type Li1.3Al0.3Ti1.7(PO4)3 solid electrolytes

NASICON-type solid electrolytes have gathered wide attention to meet the requirements of high energy density Li-metal batteries. In this study, Li1.3Al0.3Ti1.7(PO4)3 (LATP) were synthesized through co-precipitation method. The composition, phase transformation, microstructure, and particle size of LATP powder were characterized in detail. Pure LATP phase can be obtained at 800 °C with primary particle size of ~ 590 nm. In addition, the ionic conductivities of LATP pellets increased at first and then decreased with the increased sintering temperature and time. Owing to the highest relative density (95.6%), LATP (sintered at 900 °C for 6 h, LATP-9006) exhibited a highest total conductivity of 2.19 × 10−4 S/cm with a low activation energy of 0.32 eV. The results suggest that co-precipitation synthesized LATP-9006 ceramic electrolyte could be a promising alternative toward achieving a safe solid-state battery. Moreover, the co-precipitation method is suitable for the preparation of other oxide ceramic electrolytes.