Cobalt hydroxide and tricobalt tetroxide as raw materials for non-aqueous electrolyte battery active material LiCoO2 and method for producing the same

摘要

PROBLEM TO BE SOLVED: To provide a battery having the excellent cycle characteristic by controlling the arrangement of cobalt atoms in a particle, particle shape and particle diameter in the manufacture of cobalt compound as the raw material of the positive electrode active material. SOLUTION: As a deposit tank for manufacturing cobalt hydroxide, a 100l tank is used, and as the cobalt salt solution, cobalt sulfate, which is obtained by dissolving the cobalt metal at 60g/l, is used, and as the caustic alkali solution, the sodium hydroxide solution at 25% by weight is used. The cobalt salt solution is maintained at 8l/h of constant flow quantity and at 40 deg.C of in-tank temperature, and sufficiently agitated, and the sodium hydroxide solution is added so as to maintain the pH at 11-13.5. Thereafter, washing and dehydration is performed, and the cobalt salt solution is heated at 200-700 deg.C in the air atmosphere so as to obtain the tri cobalt tetraoxide.