Process for producing positive electrode active material for...

Details Process for producing positive electrode active material for... Process for producing positive electrode active material for...

2007-09-18

2007-09-18

Langel, Wayne A. (Department: 1754)

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C423S594200, C423S594400, C423S594800, C423S594120, C423S594150, C423S596000, C423S598000, C423S600000, C429S231300

Reexamination Certificate

active

11128198

ABSTRACT:
To provide a process for producing a lithium-cobalt composite oxide for a positive electrode of a lithium secondary battery excellent in volume capacity density, safety, charge and discharge cyclic durability, press density and productivity, by using in expensive cobalt hydroxide and lithium carbonate. A mixture having a cobalt hydroxide powder and a lithium carbonate powder mixed so that the atomic ratio of lithium/cobalt would be from 0.98 to 1.01, is fired in an oxygen-containing atmosphere at from 250 to 700° C., and the fired product is further fired in an oxygen-containing atmosphere at from 850 to 1,050° C., or such a mixture is heated at a temperature-raising rate of at most 4° C./min in a range from 250 to 600° C. and fired in an oxygen-containing atmosphere at from 850 to 1,050° C.

REFERENCES:
patent: 6617073 (2003-09-01), Matsumoto et al.
patent: 6756155 (2004-06-01), Kweon et al.
patent: 11-292549 (1999-10-01), None
patent: 2001-291507 (2001-10-01), None
patent: 2002-321921 (2002-11-01), None

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