Cathode active material for lithium secondary battery and method of manufacturing the same
In a method of manufacturing a cathode active material for a lithium secondary battery, a preliminary lithium metal oxide particle is prepared. The preliminary lithium metal oxide particle is cleaned using a boron compound cleaning solution. A cathode active material for a lithium secondary particle includes a lithium metal oxide particle where a ratio of a B+ peak intensity relative to a sum of peak intensities of Li+, B+ and LiB+ fragments by a TOF-SIMS analysis is in a range from 0.03% to 1.5%.
1. A cathode active material for a lithium secondary battery, comprising:
a lithium metal oxide particle; and
a boron (B) element present on at least a portion of a surface of the lithium metal oxide particle,
wherein a ratio of a B+ peak intensity relative to a sum of peak intensities of Li+, B+, and LiB+ fragments by a TOF-SIMS (Time of Flight Secondary Ion Mass Spectrometry) analysis measured from a surface of the lithium metal oxide particle is in a range from 0.03% to 1.5%, and
the lithium metal oxide particle includes a lithium nickel-based metal oxide represented by Chemical Formula 1:
Li x Ni y M 1-y O 2 [Chemical Formula 1]
wherein, in Chemical Formula 1, 0.95<x<1.08, 0.8≤y≤0.93, and M includes at least one element selected from the group consisting of Co, Mn, Al, Zr, Ti, B, Mg, and Ba.
2. The cathode active material for a lithium secondary battery according to claim 1 , wherein the ratio of the B+ peak intensity is in a range from 0.3% to 1.4%.
3. The cathode active material for a lithium secondary battery according to claim 1 , wherein an amount of boron (B) based on a total weight of the lithium metal oxide particle is in a range from 100 ppm to 800 ppm.
4. The cathode active material for a lithium secondary battery according to claim 1 , wherein the lithium metal oxide particle includes a doping or a coating which contains at least one of Al, Zr, or Ti.
5. A lithium secondary battery, comprising:
a cathode including a cathode active material according to claim 1 ;
an anode; and
a separation layer interposed between the cathode and the anode.