Cathode active material for lithium secondary battery and method of manufacturing the same
AssigneeSK On Co., Ltd.
InventorsSang Bok Kim, Ji Hoon Choi, Jik Soo Kim, Mi Jung Noh, Dong Il Jang, Dong Wook Ha
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Abstract
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%.
Claims5
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:
- LixNiyM1-yO2 [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.
Dependencies are inferred from the claim text.