Abstract: Obtaining cobalt hydroxide particles having a high filling property and a high density. The cobalt hydroxide particles used as a precursor for a positive electrode active material of a non-aqueous electrolyte secondary battery, including spherical secondary particles of flocculated primary particles, wherein average aspect ratio of the secondary particles is 0.7 or more, average particle diameter is 5 to 35 ?m, and a value of (d90?d10)/MV indicating a dispersion of a particle size distribution is 0.6 or less, wherein, in sectional observation of the secondary particles, a ratio (N/L) of number (N) of gaps with maximum long diameter 0.3 ?m or more recognized in particles of the secondary particles with sectional long diameter 3 ?m or more to sectional long diameter (L) of the secondary particles is 1.0 or less, and also, maximum long diameter of the gaps is 15% or less of sectional long diameter of the secondary particles.

Abstract: Obtaining cobalt hydroxide particles having a high filling property and a high density. The cobalt hydroxide particles used as a precursor for a positive electrode active material of a non-aqueous electrolyte secondary battery, including spherical secondary particles of flocculated primary particles, wherein average aspect ratio of the secondary particles is 0.7 or more, average particle diameter is 5 to 35 ?m, and a value of (d90-d10)/MV indicating a dispersion of a particle size distribution is 0.6 or less, wherein, in sectional observation of the secondary particles, a ratio (N/L) of number (N) of gaps with maximum long diameter 0.3 ?m or more recognized in particles of the secondary particles with sectional long diameter 3 ?m or more to sectional long diameter (L) of the secondary particles is 1.0 or less, and also, maximum long diameter of the gaps is 15% or less of sectional long diameter of the secondary particles.