Abstract: Provided is a method of manufacturing a composite hydroxide that can appropriately control a BET specific surface area. The method of manufacturing a composite hydroxide containing at least nickel (Ni) and cobalt (Co), wherein a first metal-containing aqueous solution containing A mol % of nickel (Ni) and B mol % of cobalt (Co), a second metal-containing aqueous solution containing C mol % of nickel (Ni) and D mol % of cobalt (Co), wherein A>C, B<D, A+B=100, and C+D=100, an aqueous solution of an alkali metal, and an aqueous solution containing an ammonium-ion supplying material, are separately fed into a reaction vessel; and a solution in the reaction vessel is maintained to have a pH value based on a liquid temperature at 25° C. within a range of 10.0 or higher and 13.0 or lower and a concentration of ammonium ion within a range of 1.0 g/L, or more and 10.0 g/L or less.

Abstract: A nickel-containing hydroxide capable of obtaining a positive electrode active material having excellent initial charge-discharge efficiency and a high volume capacity density. The nickel-containing hydroxide for a precursor of a positive electrode active material of a non-aqueous electrolyte secondary battery, wherein when a peak intensity of a diffraction peak appearing in the range of 2?=19.2±1 in powder X-ray diffraction measurement using CuK? rays is defined as ?, and a peak intensity of a diffraction peak appearing in the range of 2?=38.5±1 in powder X-ray diffraction measurement using CuK? rays is defined as ?, the peak intensity ratio of ?/? is 0.80 or more and 1.38 or less, and the average long diameter of primary particles is 290 nm or more and 425 nm or less.

Abstract: The present disclosure provides a precursor of a positive electrode active material, capable of obtaining the positive electrode active material that can exhibit a high discharge capacity and high charge/discharge efficiency, by being mounted on a secondary battery using a non-aqueous electrolyte, and the positive electrode active material obtained from the precursor, as well as a method for producing the positive electrode active material. The nickel composite hydroxide particles that are precursors of a positive electrode active material of a non-aqueous electrolyte secondary battery, having a void ratio of 45.0% or more and 55.0% or less.

Abstract: A composite hydroxide in which reactivity of a lithium compound is equalized with another composite hydroxide having a large particle diameter. The composite hydroxide includes at least one metal selected from the group consisting of nickel, cobalt, and manganese, the composite hydroxide being a precursor of a positive electrode active material for a non-aqueous electrolyte secondary battery, wherein a secondary particle diameter with a cumulative volume percentage of 50% by volume (D50) is 4.0 ?m or less, tapped density (g/ml)/secondary particle diameter with cumulative volume percentage of 50% by volume (D50) (?m) is 0.60 g/ml·?m or more, and a specific surface area measured by a BET method is 15.0 m2/g or less.