Commissariat a L'energie Atomique

Electricite De France - Service National

Sadacem, S.a.

Bollore Technologies S.a.

Pierre Strobel

Frederic Le Cras

Didier Bloch

Claude Oberlin

Andre Hatterer

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 MnO.sub.2 -.beta., having a specific surface below 7 m.sup.2 /g and an average grain size below 10 .mu.m, with a powder of a lithium compound such as Li.sub.2 CO.sub.3 or LiOH, at a temperature of 150.degree. to 500.degree. C. for an adequate time to convert the .beta.-MnO.sub.2 into manganese and lithium oxide having a lacunary or stoichiometric spinel structure.

Insertion compounds based on manganese oxide usable as the positive

The method consists in subjecting a mixture of an alkali nitride and/or an alkaline-earth nitride to thermal decomposition in vacuo in the presence of at least one metallic component with which it is desired to alloy the alkali metal and/or the alkaline-earth metal, the metals thus brought together are melted and the alloy thus obtained is homogenized.

Method of fabrication of an alloy containing an alkali metal and/or an

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Saint-Egreve, France

Pierre Strobel