US 11,888,102 B2
Cathode active material for lithium secondary battery and method of manufacturing the same
Sang Bok Kim, Daejeon (KR); Ji Hoon Choi, Daejeon (KR); Jik Soo Kim, Daejeon (KR); Mi Jung Noh, Daejeon (KR); Dong Il Jang, Daejeon (KR); and Dong Wook Ha, Daejeon (KR)
Assigned to SK On Co., Ltd., Seoul (KR)
Filed by SK ON CO., LTD., Seoul (KR)
Filed on Sep. 8, 2020, as Appl. No. 17/014,314.
Claims priority of application No. 10-2019-0111483 (KR), filed on Sep. 9, 2019.
Prior Publication US 2021/0074996 A1, Mar. 11, 2021
Int. Cl. H01M 4/36 (2006.01); H01M 4/131 (2010.01); H01M 4/1391 (2010.01); H01M 10/0525 (2010.01); H01M 4/525 (2010.01); H01M 4/505 (2010.01); H01M 4/04 (2006.01)
CPC H01M 4/131 (2013.01) [H01M 4/0471 (2013.01); H01M 4/1391 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01)] 5 Claims
OG exemplary drawing
 
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:
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.