[S:1]([O-:5])([O-:4])(=[O:3])=[O:2].[Ni+2:6].[S:7]([O-:11])([O-:10])(=[O:9])=[O:8].[Co+2:12].[Ni].[OH-:14].[Na+].S([O-])([O-])(=O)=[O:17].[Ni+2].S([O-])([O-])(=O)=[O:23].[Co+2]>>[S:1]([O-:5])([O-:4])(=[O:3])=[O:2].[Ni+2:6].[S:7]([O-:11])([O-:10])(=[O:9])=[O:8].[Co+2:12].[OH-:17].[Co+2:12].[Ni+2:6].[OH-:23].[OH-:14].[OH-:2]A nickel sulfate-cobalt sulfate mixed solution is prepared by dissolving nickel sulfate and cobalt sulfate at a molar ratio of Co to Ni of 20%. By adding a solution of sodium hydroxide to the nickel sulfate-cobalt sulfate mixed solution, a nickel-cobalt hydroxide is obtained by co-precipitation. By washing the obtained nickel-cobalt hydroxide in water and drying at 80° C., it becomes powdery and a nickel-cobalt hydroxide, Ni0.8Co0.2(OH)2, in which secondary particles similar to spherical or elliptic spherical particles in shape have been formed is obtained.
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