US 11,990,615 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 ON CO., LTD., Seoul (KR)
Filed by SK ON CO., LTD., Seoul (KR)
Filed on Mar. 7, 2023, as Appl. No. 18/179,367.
Application 18/179,367 is a continuation of application No. 17/401,091, filed on Aug. 12, 2021, granted, now 11,637,282.
Claims priority of application No. 10-2020-0101564 (KR), filed on Aug. 13, 2020; and application No. 10-2020-0150764 (KR), filed on Nov. 12, 2020.
Prior Publication US 2023/0223527 A1, Jul. 13, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/505 (2013.01) [H01M 4/525 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A cathode active material for a lithium secondary battery comprising a lithium-transition metal composite oxide particle,
wherein the lithium-transition metal composite oxide particle contains nickel,
wherein a lattice strain (η) calculated by applying Williamson-Hall method defined by Equation 1 to XRD peaks measured through X-ray diffraction (XRD) analysis is 0.18 or less,
β cos θ=η sin θ+λ/D  [Equation 1]
wherein, in Equation 1, β represents full width at half maximum (FWHM) (rad) of one of the peaks, θ represents a diffraction angle (rad) of the one of the peaks, η represents a lattice strain (dimensionless number), λ represents an X-ray wavelength (Å), and D represents a crystallite size (Å).