Insertion compounds based on manganese oxide usable as the positive electrode active material in a lithium battery
AssigneesCommissariat a l'Energie Atomique, Electricite de France (Service National), Bollore Technologies, Sadacem
InventorsDidier Bloch, Frederic Le Cras, Pierre Strobel
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Abstract
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.
Claims10
Process for the preparation of an insertion compound based on manganese and lithium oxide by reaction in the solid state between the manganese oxide and a lithium compound, wherein 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, is reacted with a powder of a lithium compound selected from the group consisting of lithium oxides, hydroxides, carbonates and nitrates, which may or may not be hydrated, at a temperature of 150.degree. to 500.degree. C. for a time adequate to convert said MnO.sub.2 -.beta. into manganese and lithium oxide with a lacunary or stoichiometric spinel structure.
Dependencies are inferred from the claim text.