Island-covered lithium cobaltite oxides

Details Island-covered lithium cobaltite oxides Island-covered lithium cobaltite oxides

C - Chemistry, Metallurgy

01

G

C01G 45/00 (2006.01) C01G 51/00 (2006.01) C01G 53/00 (2006.01) H01M 4/52 (2006.01)

Patent

CA 2676390

Disclosed is a cathode active material and a method to produce the same at low cost. The cathode powder comprises modified LiCoO2, and possibly a second phase which is LiM'O2 where M' is Mn, Ni, Co with a stoichiometric ratio Ni: Mn >=1. The modified LiCoO2 is Ni and Mn bearing and has regions of low and high manganese content, where regions with high manganese content are located in islands on the surface. The cathode material has high cycling stability, a very high rate performance and good high temperature storage properties.

Matériau actif de cathode et son procédé de fabrication à faibles coûts. La poudre de cathode comprend du LiCoO2 modifié et, probablement, une seconde phase qui constitue LiM'O2 où M' représente Mn, Ni, Co avec un rapport stoechiométrique Ni: Mn >=1. Le LiCoO2 modifié supporte Ni et Mn et a des régions à faible et forte teneur en manganèse, les régions à forte teneur en manganèse se situant dans des ilôts en surface. Le matériau de cathode a une stabilité de cycle élevée, un certain rendement à rapport très élevé et de bonnes propriétés de stockage à température élevée.

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