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 SECOND

摘要

The purpose of the present invention is to provide a transition metal composite hydroxide which is capable of providing a lithium-transition metal composite oxide that has small particle diameters and high particle diameter uniformity when used as a precursor. A method for producing a transition metal composite hydroxide which is represented by general formula (1): MxWsAt(OH)2+a (wherein x + s + t = 1, 0 < s = 0.05, 0 < s + t = 0.15, 0 = a = 0.5, M represents a transition metal including one or more elements selected from among Ni, Co and Mn, and A represents at least one additional element selected from among transition metal elements other than M and W, group 2 elements and group 13 elements) and is coated with a compound that contains the additional element, said transition metal composite hydroxide being capable of serving as a precursor of a positive electrode active material for nonaqueous electrolyte secondary batteries. The method for producing a transition metal composite hydroxide is characterized by comprising: a complex hydroxide particle production step which includes a nucleation stage for performing nucleation and a particle growth stage for growing the thus-formed nuclei; and a coating step wherein the surface of each complex hydroxide particle obtained in the preceding step is covered with a coating material that contains a metal oxide or a metal hydroxide.