Patent ID: 11955632
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C  Y | IPC C  H

Claim 14:
15. A method of preparing a positive active material from the positive active material precursor of claim 1 for a rechargeable lithium battery, the method comprising:
mixing a nickel compound, a cobalt compound, and optionally a metal compound to obtain a first mixture;
subjecting the first mixture to a co-precipitation reaction to obtain a first resulting product, washing with water, filtering and drying the first resulting product to prepare a transition metal hydroxide precursor represented by Chemical Formula 1A,

NixCoyM1-x-y(OH)2,

wherein M is at least one selected from Mn, Ni, Co, Al, Fe, V, Ti, Mg, Zr, B, F, and Cr, 0.3≤x≤1, 0≤y≤0.7, and 0.3≤x+y≤1;
subjecting the transition metal hydroxide precursor to a primary heat treatment at about 400° C. to about 600° C. for about 0.5 hour to about 20 hours to prepare a transition metal composite oxide precursor; and
mixing the transition metal composite oxide precursor and a lithium salt to obtain a second mixture and performing a secondary heat treatment on the second mixture to prepare a nickel-based lithium transition metal oxide.