Lithium-ion Conductors of NASICON-structured Ca²⁺ Substituted LiZr₂(PO₄)₃ Solid Electrolytes Obtained by Heat Treatment of Amorphous Materials in the Li₂O-CaO-ZrO₂-P₂O₅ System

Amorphous powder in the Li2O-CaO-ZrO2-P2O5 system were prepared by using mechanochemical synthesis process at room temperature.Amorphous materials with the nominal composition of Li1+2xCaxZr2-x(PO4)3(LCZP)(x=0.05, 0.08, 0.1) were calcinated at 900 °C in air.The calcinated LCZP materials were sintered at 1100 °C.The NASICONstructured LCZP(x=0.08)solid electrolytes after sintering exhibited relatively high lithium-ion conductivities of 1.2×10 -5 S cm -1 at 25 °C.The activation energy (Ea) was 35 kJ mol -1 .The LCZP solid electrolytes obtained via the crystallization of amorphous materials would be a potential candidate as lithium-ion conductors for all-solid-state battery applications.