NICKEL-CONTAINING COMPOSITE HYDROXIDE AND PRODUCTION PROCESS THEREFOR, POSITIVE ACTIVE MATERIAL FOR NONAQUEOUS-ELECTROLYTE SECONDARY BATTERY AND PRODUCTION PROCESS THEREFOR, AND NONAQUEOUS-ELECTROLYTE SECONDARY BATTERY

WIPO Patent Application WO/2016/068263

A1

Provided is a nickel composite hydroxide that is a precursor of a positive active material with which a nonaqueous-electrolyte secondary battery having a low irreversible capacity and a high energy density can be configured. An aqueous alkali solution and a complexing agent are added to an aqueous mixture solution containing at least nickel and cobalt to regulate the pH (measured at liquid temperature of 25°C) of this aqueous mixture solution to 11.0-13.0, the ammonium ion concentration to 4-15 g/L, and the reaction temperature to 20-45°C. Using stirring blades having an inclination angle of 20-60° with the horizontal plane, the mixture is stirred to conduct a crystallization reaction under such conditions that when the nickel-containing composite hydroxide to be obtained is roasted in the air at 800°C for 2 hours, then the roasted composite hydroxide has a BET value of 12-50 m2/g. Thus, a nickel composite hydroxide represented by Ni1-x-yCoxAlyMt(OH)2+ α (where 0