NICKEL COBALT COMPOUND HYDROXIDE AND METHOD FOR PRODUCING THE SAME, AND POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY OBTAINED BY USING THE COMPOUND HYDROXIDE

摘要

PROBLEM TO BE SOLVED: To provide a nickel cobalt compound hydroxide which has a large particle diameter, has high density, and is nearly spherical, and which is suitable as a precursor of a positive electrode active material for a nonaqueous electrolyte secondary battery to further heighten energy density of a battery by improving packing density.SOLUTION: In a method for producing a nickel cobalt compound hydroxide, when the nickel cobalt compound hydroxide is obtained by: supplying a mixed aqueous solution (a) including a nickel salt and a cobalt salt and an aqueous solution (b) including an ammonium ion supplying body; simultaneously making a reaction take place by supplying a caustic alkali aqueous solution (c) while stirring the reaction solution; subjecting the crystallized nickel cobalt compound hydroxide particles to solid-liquid separation; washing it by water; and drying it, the reaction solution is stirred by using a stirring blade having an inclination of 45° or less to the horizontal plane, wherein a rate of an amount supplied of the mixed aqueous solution (a) versus an amount of the reaction solution per supply port is made to be 0.04 vol.%/min or less.