| 摘要 |
The present invention provides a method for manufacturing an anode active material for a lithium secondary battery comprising the following steps of: a) simultaneously mixing a first metallic salt aqueous solution including nickel, cobalt, manganese and optionally a transition metal, a chelating agent, and a basic aqueous solution in a reactor, and mixing with a lithium raw material and calcining to manufacture a center part including the compound of following Chemical Formula 1: Lix1[Ni1−y1−z1−w1Coy1Mnz1Mw1]O2  Chemical Formula 1 (wherein, 0.9≦̸x1≦̸1.3, 0.1≦̸y1≦̸0.3, 0.0≦̸z1≦̸0.3, 0≦̸w1≦̸0.1, and M is at least one metal selected from the group consisting of Mg, Zn, Ca, Sr, Cu, Zr, P, Fe, Al, Ga, In,Cr, Ge, and Sn); b) simultaneously mixing a second metallic salt aqueous solution including nickel, cobalt, manganese and optionally a transition metal, the chelating agent, and the basic aqueous solution in a reactor, mixing with the lithium raw material and calcining, and grinding thereof to the size of nanometers to manufacture a compound for forming an outer part including the compound of following Chemical Formula 2: Lix2[Ni1−y2−z2−w2Coy2Mnz2Mw2]O2  Chemical Formula 2 (wherein, 0.9≦̸x2≦̸1+z2, 0≦̸y2≦̸0.33, 0≦̸z2≦̸0.5, 0≦̸w2≦̸0.1 and M is at least one metal selected from the group consisting of Mg, Zn, Ca, Sr, Cu, Zr, P, Fe, Al, Ga, In, Cr, Ge, and Sn); c) mixing the center part manufactured from step a) and the compound for forming the outer part manufactured from step b) to form the outer part on the center part surface; and d) heat-treating the compound obtained from step c) at 500-800° C. to form a bi-layer structure in which lithium is present at a continuous concentration-gradient from the contact interface of the center part and the outer part to the surface part of the outer part, and an anode active material for a lithium secondary battery manufactured thereby. |
