Positive active material for rechargeable lithium battery, method of preparing the same and rechargeable lithium battery including the same
A positive electrode active material and lithium battery technology, applied in the direction of active material electrodes, electrode manufacturing, battery electrodes, etc., can solve the problems of increased cation mixing value and degradation of charging/discharging efficiency, etc., to reduce the cation mixing value and improve phase stability and cycle life characteristics, effects of improving charge/discharge capacity and charge/discharge efficiency
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[0104] The method for preparing a positive electrode active material according to an embodiment includes mixing Compound 1A represented by Chemical Formula 1A, Compound 2A represented by Chemical Formula 2A having a smaller particle size than Compound 1A, and a lithium salt to prepare a mixture; The mixture is subjected to a first heat treatment to produce a first combustion product including unreacted residual lithium; and the first combustion product is subjected to a second heat treatment.
[0105] [Chemical Formula 1A]
[0106] Ni x co y m 1 z (OH) 2
[0107] [Chemical Formula 2A]
[0108] Ni x co y m 2 z (OH) 2
[0109] In Chemical Formula 1A and Chemical Formula 2A, 0.5≤x≤0.6, 0.05≤y≤0.35, 0.05≤z≤0.35, x+y+z=1, and M 1 and M 2 are independently at least one metal element selected from Mn, Al, Cr, Fe, V, Mg, Ti, Zr, Nb, Mo, W, Cu, Zn, Ga, In, Sn, La and Ce.
[0110] In chemical formula 1A and chemical formula 2A, Ni, Co, M 1 and M 2 The ideal composition ...
Embodiment 1
[0161] By mixing lithium carbonate (Li 2 CO 3 ) and Ni 0.55 co 0.25 mn 0.20 (OH) 2 A mixture was prepared by supplying Li:(Ni+Co+Mn) in a molar ratio of 1.01:1.00. In this paper, Ni was obtained by mixing Compound 1A and Compound 2A with the same composition but different particle sizes at a weight ratio of 8:2 0.55 co 0.25 mn 0.20 (OH) 2 .
[0162] The as-prepared mixture was subjected to a first heat treatment under conditions of heating at 5°C / min from 25°C to 900°C and holding at 900°C for 2 hours, and then cooling at 5°C / min until 25°C to provide The first compound (Li 1.01 Ni 0.55 co 0.25 mn 0.20 o 2 ) and the second compound (Li 1.01 Ni 0.55 co 0.25 mn 0.20 o 2 ) of the first combustion product. At the same time, the first heat treatment process was performed under an air atmosphere with an embedding height of 5 cm.
[0163] The first combustion product was subjected to a second heat treatment under conditions of heating from 25°C to 850°C at 5°C / mi...
Embodiment 2
[0183] 94 wt% of the positive active material prepared in Example 1, 3 wt% of Ketjen Black and 3 wt% of polyvinylidene fluoride were mixed in N-methylpyrrolidone solvent to prepare positive active material slurry. The positive active material slurry was coated on an aluminum foil, which was then dried and pressed to manufacture a positive electrode. A 2032-type half-cell was fabricated by a conventional method using a positive electrode, a lithium metal counter electrode, and an electrolyte. The electrolyte is a mixed solvent of ethylene carbonate and dimethyl carbonate (volume ratio 50:50), in which 1.0M LiPF is dissolved 6 .
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