Patent ID: 7981547
Filing Date: 2011-07-19
Classification: C01G,C01P,H01M,Y02E

Abstract:
1. A process for producing a positive electrode active material, comprising: firing, as a cobalt source, a mixture of substantially spherical cobalt hydroxide or tricobalt tetraoxide having such a sharp particle size distribution that the average particle size D50 is from 7 to 20 μm, the average particle size D10 is at least 50% of the average particle size D50 and the average particle size D90 is at most 150% of the average particle size D50, and cobalt oxyhydroxide having an average particle size of secondary particles formed by agglomeration of primary particles of from 7 to 20 μm, in a proportion of from 5:1 to 1:5 as the cobalt atomic ratio, at a temperature of from 700° C. to 1050° C. in an oxygen-comprising atmosphere, to obtain said positive electrode active material which comprises a lithium-cobalt composite oxide represented by the formula Li