	US 12,113,217 B2
	Cathode active material for lithium secondary battery and lithium secondary battery including the same
Ji Yae Do, Daejeon (KR); Min Suk Kang, Daejeon (KR); Min Cheol Beak, Daejeon (KR); Kwang Ho Lee, Daejeon (KR); and Wan Uk Choi, Daejeon (KR)
Assigned to SK INNOVATION CO., LTD., Seoul (KR); and SK ON CO., LTD., Seoul (KR)
Filed by SK INNOVATION CO., LTD., Seoul (KR); and SK ON CO., LTD., Seoul (KR)
Filed on Nov. 3, 2023, as Appl. No. 18/501,932.
Claims priority of application No. 10-2022-0148163 (KR), filed on Nov. 8, 2022.
Prior Publication US 2024/0154118 A1, May 9, 2024
Int. Cl. H01M 4/58 (2010.01); C01B 25/45 (2006.01); H01M 4/131 (2010.01); H01M 10/052 (2010.01); H01M 4/02 (2006.01)

CPC H01M 4/5825 (2013.01) [C01B 25/45 (2013.01); H01M 4/131 (2013.01); H01M 10/052 (2013.01); C01P 2002/54 (2013.01); C01P 2002/60 (2013.01); C01P 2002/72 (2013.01); C01P 2006/40 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)]

12 Claims

1. A cathode active material for a lithium secondary battery comprising a lithium metal phosphate particle having a crystallite size in a range from 150 nm to 450 nm in a direction of a crystallographic plane (020) as measured by an X-ray diffraction (XRD) analysis,

wherein a particle crystallite size ratio determined by Equation 2 based on a measurement by the XRD analysis is greater than 0 and less than 1:

particle crystallite size ratio=Lp(020)/Lp(200) [Equation 2]

wherein, in Equation 2, Lp(020) is a value in nm corresponding to the crystallite size in the direction of the crystallographic plane (020) of the lithium metal phosphate particle, and Lp(200) is a value in nm corresponding to a crystallite size in a direction of a crystallographic plane (020) of the lithium metal phosphate particle.