TRANSITION METAL COMPOSITE HYDROXIDE CAPABLE OF SERVING AS PRECURSOR OF POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERIES, METHOD FOR PRODUCING SAME, POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERIES, METHOD FOR PRODUCING POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERIES, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY USING POSITIVE ELECTRODE ACTIVE MATERIAL

摘要

The present invention aims at providing a transition metal composite hydroxide, the use of which as a precursor allows a lithium transition metal composite oxide having a small and highly uniform particle diameter to be obtained. Provided is a method for producing a transition metal composite hydroxide represented by a general formula (1) M x W s A t (OH) 2+± (wherein, x + s + t = 1, 0 s ‰¤ 0.05, 0 s + t ‰¤ 0.15, 0 ‰¤ ± ‰¤ 0.5, M is at least one transition metal selected from Ni, Co and Mn, and A is at least one additive element selected from transition metal elements other than M and W, group 2 elements, and group 13 elements), coated with a compound containing the additive element, and serving as a precursor of a positive electrode active material for nonaqueous electrolyte secondary batteries, the method comprising: a composite hydroxide particle production step including a nucleation stage of forming nuclei and a particle growth stage of growing a formed nucleus; and a coating step forming a coating material containing a metal oxide or hydroxide on the surfaces of composite hydroxide particles obtained through the upstream step.