用于锂离子电池球形锰酸锂的工业化制备研究

Industrial Preparation of Spherical LiMn_2O_4 Cathode Material for Lithium Ion Batteries

本文以氢氧化锂、醋酸锰及碳酸锰为原料,采用液相法合成凝胶浆料和半固相浆料,利用喷雾干燥法获得球形锰酸锂前驱体,研究了动态焙烧喷雾干燥前驱体制备球形锰酸锂正极材料用于锂离子电池。研究结果显示,动态低温分解与高温分解相结合的方法能有效保持前驱体的球形,合成的球形锰酸锂具有良好的电化学性能。该方法适合于工业化生产球形锂离子电池正极材料。

Spherical LiMn2O4 particles were successfully synthesized by dynamically sintering spherical precursor powders, which were prepared by slurry spray-drying method. The slurry was prepared by solution method from the starting materials of lithium hydroxide, manganese acetate and manganese carbonate. The results indicated that the two-step dynamic sintering procedure consisting of completely decomposing sprayed precursors at low temperature and further sintering at elevated temperature facilitated spherical particle formation. The spherical LiMn2O4 product made by the dynamic sintering process had a good electrochemical performance for lithium ion batteries. This novel method combining a dynamic sintering system and a spray-drying process was an effective synthesis method for spherical cathode material in lithium ion batteries.