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

US5700442A · kind A · utility

Assignees

• COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES · FR
• Electricite de France - Service National · FR
• Bollore Technologies · FR
• Sadacem, S.A. · BE

Inventors

• Didier Bloch · Biviers, FR
• Frederic Le Cras · L'Isle-d'Abeau, FR
• Pierre Strobel · Mulhouse, FR

Key dates

• Filing date: Jun 19, 1995
• Grant date: Dec 23, 1997
• Expiry date: Jun 19, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E60/10
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

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.