CPC H01M 4/525 (2013.01) [H01M 4/0471 (2013.01); H01M 4/505 (2013.01); H01M 10/0525 (2013.01); H01M 2004/028 (2013.01)] | 18 Claims |
1. A positive active material for a rechargeable lithium battery, the positive active material comprising:
a lithium nickel-based metal composite oxide;
a secondary particle, in which a plurality of primary particles are aggregated;
a first boron coating portion on an outer surface of the secondary particle; and
a second boron coating portion on surfaces of the primary particles inside the secondary particle,
wherein a weight of the first boron coating portion is greater than a weight of the second boron coating portion, and
wherein a content of the second boron coating portion is about 10 ppm to about 500 ppm based on the positive active material.
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