纯相尖晶石型锰酸锂纳米粉体的熔盐法制备

以碳酸锂为锂源，自制的纳米级三氧化二锰为锰源，通过熔盐法合成了纯相的纳米级的尖晶石型锰酸锂粉体。利用热重-差热分析、XRD物相分析和SEM形貌分析等，对前驱体碳酸锰、自制的三氧化二锰和合成物锰酸锂进行了系列表征。研究结果显示：在以碳酸氢铵为沉淀剂、溶液pH=9、搅拌速度为400 r/min的条件下，制得了纯相、超细（粒径在1 μm左右）、粒径均匀的球形碳酸锰粉体；在升温速率为10 ℃/min、550 ℃焙烧6 h的条件下，制得了纯相的、纳米级（75~100 nm）、无团聚、分散性好、球形及哑铃形的三氧化二锰粉体；在锂锰物质的量比为1.1∶ 2.0，以氯化钾为熔盐，700 ℃焙烧10 h的条件下，合成了纯相、纳米级（粒径为100 nm）、粒径均匀的尖晶石型锰酸锂粉体。

Synthesis of pure phase spinel LiMn2O4 nano-powders by molten salt method

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 witheven 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 wereprepared by roasting at 550 ℃ for 6 h，and heating rate of 10 ℃/min；the pure phase，nanometer（100 nm） powders of spinelLiMn2O4 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.