Abstract: The nanometer powders of pure phase spinel LiMn2O4 were synthesized by molten salt method with Li2CO3 and self-made nanometer Mn2O3.The properties of precursor MnCO3，self-made Mn2O3，and LiMn2O4 were characterized by TG/DTA，XRD，and SEM.Results indicated that the pure phase，ultrafine（particle size about 1μm），and spherical MnCO3 powders with even particle size and narrow distribution were prepared by NH3HCO3 as the precipitant，pH=9，and stirring speed of 400 r/min；the pure phase，nanometer（75~100 nm），no agglomeration，good dispersity，spherical，and dumbbell Mn2O3 powders were prepared by roasting at 550 ℃ for 6 h，and heating rate of 10 ℃/min；the pure phase，nanometer（100 nm） powders of spinel LiMn2O4 with even uniform particle size were prepared at amount-of-substance ratio of Li/Mn was 1.1∶2.0，KCl as molten salt， and roasting at 700 ℃ for 10 h.

Key words: Mn2O3, molten salt method, spinel LiMn2O4, nano-powder