Patent ID: 6241959
Filing Date: 2001-06-05
Classification: C01G,C01P,H01M,Y02E

Abstract:
A method for preparing a lithium composite oxide (Li.sub.a Ni.sub.(1-x) Co.sub.x O.sub.2, where a=0.97.about.1.05 and x=0.1.about.0.3), comprising the steps of:(a) coprecipitating a Ni--Co composite hydroxide by adding an aqueous ammonia solution as a complexing agent, and an alkaline solution as a pH-adjusting agent, to an aqueous mixed solution containing a cobalt salt and a nickel salt;(b) mixing lithium hydroxide to the composite hydroxide and thermally treating the mixture at 280.about.420.degree. C.; and(c) thermally treating the product of step (b) at 650.about.750.degree. C.