Positive electrode active material for non-aqueous electrolyte secondary batteries and its manufacturing method, positive electrode mixture paste for non-aqueous electrolyte secondary batteries and non-aqueous electrolyte secondary batteries

摘要

It is an object of the present invention to provide a positive electrode active material for a non-aqueous electrolyte secondary battery capable of suppressing gelation of a positive electrode mixture paste in manufacturing a non-aqueous electrolyte secondary battery and improving stability. Has a layered crystal structure of a hexagonal system, the general formula _(1): A _{Li 1 + s Ni x Co y} Mn z M w B t O 2 + positive electrode active material for non-aqueous electrolyte secondary batteries represented by _alpha, multiple The positive electrode active material containing a lithium metal composite oxide containing secondary particles in which primary particles are aggregated and a lithium boron compound present on at least a part of the surface of the primary particles, and is measured by a neutralization titration method. A positive electrode active material for a non-aqueous electrolyte secondary battery in which the amount of lithium hydroxide eluted when dispersed in water is 0.01% by mass or more and 0.5% by mass or less with respect to the entire positive electrode active material.