POSITIVE ELECTRODE ACTIVE MATERIAL CONTAINING SOLID SOLUTION ACTIVE MATERIAL, POSITIVE ELECTRODE CONTAINING THE POSITIVE ELECTRODE ACTIVE MATERIAL, AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY USING THE POSITIVE ELECTRODE

摘要

A method for producing a positive electrode active material includes coating a surface of a solid solution active material represented by formula (1): Li_1.5[Ni_0.40Mn_0.60Co_0.40[Li]_0.1]O_z, wherein X represents at least one selected from Ti, Zr and Nb, 0≤e≤0.5, a+b++c+d+e=1.5, 0.1≤d≤0.4, and 1.1≤[a+b+c+e]≤1.4, and z represents the number of oxygen atoms satisfying an atomic valence, with alumina; and preparing the solid solution active material. The preparing comprises mixing an organic acid salt of a transition metal having a melting point of 100° C. to 350° C., melting the mixture obtained in the first step at 100° C. to 350° C., subjecting the molten substance to pyrolysis at a temperature equal to higher than the melting point and calcining the pyrolysate obtained.