Cathode active material, method for producing the same, and method for using the same

Abstract

Formula x Li2Ni 1-y1-y2 Mn y1 M 1 y2 O3 (1-x) LiNi 1-z M 2 z O2 (In the formula, x is in the range of 0.01 to 0.5, and z is in the range of 0 to 0.5, M 1 is selected from Ti, Zr, Sn, Ge, Ta, Nb, Sb, W, Mo, and a combination of at least two of the above; M 2 is at least one of Co, Al, Mg, Fe, or Mn, or a combination of at least two of the above; 0.1≦y1≦0.75, 0≦y2≦0.05) A method for producing a complex oxide according to the present invention, The method comprises the steps of: (a) General formula x Ni 1-y1-y2 Mn y1 M 1 y (1-x)Ni 1-z M 2 z TM particulate hydroxide, oxide or oxyhydroxide, or M 1 and / or M 2 providing a corresponding species that does not contain (b) adding a lithium source; (c) heat treating the mixture obtained from step (b) in an oxygen-containing atmosphere in two steps: (c) heating the mixture obtained from step (b) to 680-800° C. in an atmosphere containing oxygen in the range of 10-100% by volume; and (e) heating the intermediate from step (c) to 450-580° C. in an atmosphere containing at least 90% by volume of oxygen; Includes.

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