Synthesis of Al-doped lithium manganese oxide from Al2O3-Li2CO3-MnO2 ternary system

Al-doped LiMn2O4 was synthesized by gamma-Al2O3, which has not toxic gas decomposed in the synthesis process. Composition optimization of was carried out in view of the basic knowledge of ternary phase diagram to find the best composition of raw materials in Al2O3-Li2CO3-MnO2 ternary system. The results showed that the Al2O3-Li2O-Mn2O3 ternary eutectic molten compound with single spinel structure and good electrochemical performance could be formed at temperature of 800 degrees C and the molar ratio of the starting materials in the range of n(Al2O3)=0 similar to 3.3 mol%, n(Li2CO3)=18 similar to 22 mol%, n(MnO2)=75 similar to 82 mol%. The Al2O3-Li2O-Mn2O3 ternary eutectic compound with the molar ratio of the starting materials of n(Al2O3):n(Li2CO3):n(MnO2) at 0.02:0.5:1.96, showed the best electrochemical performance among all studied samples.