US 12,132,198 B2
Cathode active material for lithium secondary battery and lithium secondary battery including the same
Sang Bok Kim, Daejeon (KR); Sang Hye Shin, Daejeon (KR); Sang Min Park, Daejeon (KR); Tae Kyoung Lee, Daejeon (KR); Myoung Lae Kim, Daejeon (KR); Jeong Bae Yoon, Daejeon (KR); Jik Soo Kim, Daejeon (KR); and Ji Hoon Choi, Daejeon (KR)
Assigned to SK ON CO., LTD., Seoul (KR)
Filed by SK INNOVATION CO., LTD., Seoul (KR)
Filed on Nov. 25, 2022, as Appl. No. 17/994,177.
Application 17/994,177 is a continuation of application No. 17/512,440, filed on Oct. 27, 2021, granted, now 11,637,279.
Claims priority of application No. 10-2021-0052405 (KR), filed on Apr. 22, 2021.
Prior Publication US 2023/0105644 A1, Apr. 6, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/60 (2006.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/364 (2013.01) [H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 4/60 (2013.01); H01M 10/0525 (2013.01); H01M 2004/028 (2013.01)] 12 Claims
 
1. A method of manufacturing a cathode active material for a lithium secondary battery comprising:
preparing a preliminary lithium-transition metal composite oxide particle;
mixing the preliminary lithium-transition metal composite oxide particle with a sulfonyl-based compound aqueous solution including the sulfonyl-based compound represented by Structural Formula 1 below; and
performing a drying and a heat treatment on the mixed preliminary lithium-transition metal composite oxide particle and the sulfonyl-based compound aqueous solution, to prepare a lithium-transition metal composite oxide particle comprising a plurality of primary particles and a lithium-sulfur-containing portion formed between the primary particles,
wherein an average sulfur signal value of the lithium-sulfur-containing portion measured through energy dispersive spectroscopy (EDS) is 1.2 to 3.8 times greater than an average sulfur signal value in the primary particles measured through the EDS:

OG Complex Work Unit Chemistry
(In Structural Formula 1, n is 0≤n<3, R1 and R2 are O−, NH2, NH3+, OH, or a hydrocarbon group having 1 to 3 carbon atoms that can be substituted with a substituent, and the substituent includes a halogen, cyano group, hydroxyl group, phosphoric acid group, carboxyl group or a salt thereof).