| 摘要 |
Provided is a transition metal precursor comprising a composite transition metal compound represented by Formula 1, as a transition metal precursor used in the preparation of a lithium-transition metal composite oxide:
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ M(OH 1-x ) 2 €ƒ€ƒ€ƒ€ƒ€ƒ(1)
wherein M is two or more selected from the group consisting of Ni, Co, Mn, Al, Cu, Fe, Mg, B, Cr and the transition metals of 2 period in the Periodic Table of the Elements; and 0<x<0.5. The transition metal precursor in accordance with the present invention has an oxidation number of a transition metal approximate to an oxidation number of a transition metal of the lithium-transition metal composite oxide prepared therefrom. Therefore, when the lithium-transition metal composite oxide is prepared using such a precursor, an oxidation or reduction process for varying an oxidation number can be simplified, resulting in superior process efficiency. In addition, the-thus prepared lithium-transition metal composite oxide not only exhibits excellent performance as a cathode active material, but also shows significantly less production of reaction by-products such as Li 2 CO 3 or LiOH·H 2 O, which consequently can provide a solution to problems such as gelation of slurry, deterioration in high-temperature performance of the fabricated battery, swelling at high temperatures, etc., due to undesirable by-products. |
