PROCESS FOR PRODUCING A LITHIUM MANGANESE OXIDE SPINEL AS THE CATHODE MATERIAL FOR LITHIUM SECONDARY BATTERIES

摘要

The reaction of a manganese salt and a lithium compound in the finely dispersed phase or in clear solution with citric acid provides a metallic-organic salt mixture which, after the removal of the dispersing agent (H2O, ethanol, homopolar solvent), is thermally decomposed by evaporation and preferably by spray drying to provide a lithium manganese oxide compound with a spinel structure. Despite a relatively low synthesis temperature ( SIMILAR 500 DEG C), the end product obtained after grinding and stoving is free from phase shift and differs from spinels of the same composition but obtained by ceramic methods in a clearly smaller lattice constant. The contracted lattice gives good capacitive behaviour and good cycle stability.