| 摘要 |
PURPOSE: A positive electrode material has high sphericity, has extremely low specific surface area, and prevents side-reactions with electrolyte solution at high temperatures. CONSTITUTION: A positive electrode material includes spherical cobalt hydroxide which is manufactured by coprecipitating an aqueous solution mixed of a cobalt raw material, a hydroxide raw material, a heterometal raw material for substitution, and amine raw material. The cobalt hydroxide has a composition ratio represented by Co_(1-x)M_x(OH)_2 where x is 0.00<=x<=0.10, and M is Al, Mg, or Ti. The average granularity of the cobalt hydroxide is 15-30 micron. The amine raw material includes ethylene diamine, urea, or succinonitrile. The cobalt raw material includes cobalt metal, oxalic acid manganese, manganese acetate, manganese nitrate, or sulphate manganese. The heterometal includes Al, Mg, or Ti. [Reference numerals] (AA) Start; (BB) End; (S10) Produce round cobalt hydroxide with high-density in which heterometal is substituted, while controlling pH of an aqueous solution mixed of a cobalt raw material, a hydroxide raw material, a heterometal raw material for substitution, and amine raw material; (S20) Heat-treat cobalt hydroxide at 500-800°C to produce round cobalt hydroxide with high-density in which heterometal is substituted; (S30) Mix Li_2CO_3 with cobalt hydroxide and heat-treat at 900-1100°C to produce lithium cobaltate, a raw material for anode; (S40) Pulverize heat-treated anode material for confrication |
