FABRICATION OF LITHIUM-COBALT OXIDE NANO POWDER BY SURFACE MODIFICATION OF PRECURSOR

摘要

PURPOSE: Provided is a preparation method of LiCoO2 powder with nanosize particles and homogeneous particle size distribution by modifying the surface of (Li,Co)-precursors as starting materials and thermal treating. CONSTITUTION: The nanosize LiCoO2 powder is prepared by the following steps of: preparing (Li,Co)-precursors, starting materials, by dissolving Li-acetate and Co-acetate in water and freeze-drying mixed solution; surface-modifying (Li,Co)-precursor powder containing 100-130% of Li, by mixing precursor powder with soluble salt such as K2SO4, (NH4)2CO3, NaCl or KCl in a weight ratio of 6:1 through the mechanical process such as ball milling; heating to 400deg.C at 3deg.C/min and holding for 6hrs to form low-temperature polymorph, and then heating to 800deg.C and holding for 12hrs to get LiCoO2 powder with high-temperature polymorph; washing obtained powder with water to remove soluble salt of the surface of LiCoO2 powder. The resultant LiCoO2 powder is applied to the preparation of positive electrodes and metal oxides powder.