Insertion compounds based on manganese oxide usable as the positive electrode active material in a lithium battery

摘要

The invention relates to the preparation of insertion compounds based on manganese oxide, usable as the positive electrode active material in a lithium battery. These compounds in the hatched area of FIG. 1 can be prepared by reacting in the solid state a manganese oxide powder MnO2- beta , having a specific surface below 7 m2/g and an average grain size below 10 mu m, with a powder of a lithium compound such as Li2CO3 or LiOH, at a temperature of 150 DEG to 500 DEG C. for an adequate time to convert the beta -MnO2 into manganese and lithium oxide having a lacunary or stoichiometric spinel structure.