| abstract |
PROBLEM TO BE SOLVED: To provide a highly reactive cobalt oxide fine powder having fine particles, uniform particle size distribution and high reactivity. An aqueous solution of A cobalt salt is neutralized by excess alkali aqueous solution, the concentration ratio R of alkali to cobalt salt [OH -] / 2 [Co 2+] excess alkali in 1.0 to 1.2 A suspension of cobalt hydroxide having a concentration of 0.1 M or less, then heating the suspension to 60 ° C. or higher, blowing an oxygen-containing gas into the suspension to oxidize cobalt ions, A fine powder of cobalt oxide is precipitated. |