US 12,087,945 B2
Cathode active material for lithium secondary battery and lithium secondary battery including the same
Sang Han Lee, Daejeon (KR); Min Gu Kang, Daejeon (KR); Jeong Bae Yoon, Daejeon (KR); and Yong Hyun Cho, Daejeon (KR)
Assigned to SK INNOVATION CO., LTD., Seoul (KR)
Filed by SK INNOVATION CO., LTD., Seoul (KR)
Filed on Jun. 3, 2021, as Appl. No. 17/338,317.
Claims priority of application No. 10-2020-0067818 (KR), filed on Jun. 4, 2020; and application No. 10-2021-0017376 (KR), filed on Feb. 8, 2021.
Prior Publication US 2021/0384505 A1, Dec. 9, 2021
Int. Cl. H01M 4/525 (2010.01); H01M 4/02 (2006.01); H01M 10/0525 (2010.01)
CPC H01M 4/525 (2013.01) [H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A cathode active material for a lithium secondary battery comprising a lithium-transition metal composite oxide particle having a single particle shape having a crystallographic single crystal or polycrystalline structure,
wherein a crystal grain size of the lithium-transition metal composite oxide particle measured by an XRD analysis is in a range from 250 nm to 600 nm, and
an XRD peak intensity ratio defined by Equation 2 of the lithium-transition metal composite oxide particle is 9.8% or less:
XRD peak intensity ratio (%)=100×I(110)/{I(110)+I(003)}  [Equation 2]
wherein, in Equation 2, I(110) is a maximum height of a peak corresponding to a (110) plane by the XRD analysis of the lithium-transition metal composite oxide particle, and I(003) is a maximum height of a peak corresponding to a (003) plane by the XRD analysis of the lithium-transition metal composite oxide particle.