US 12,463,206 B2
Cathode active material for lithium secondary battery and method of manufacturing the same
Sang Bok Kim, Daejeon (KR); Jik Soo Kim, Daejeon (KR); Hyo Shin Kwak, Daejeon (KR); and Myoung Lae Kim, Daejeon (KR)
Assigned to SK ON CO., LTD., Seoul (KR)
Filed by SK ON CO., LTD., Seoul (KR)
Filed on Jul. 14, 2022, as Appl. No. 17/864,956.
Application 17/864,956 is a continuation of application No. 16/692,895, filed on Nov. 22, 2019, granted, now 11,502,291.
Claims priority of application No. 10-2018-0147722 (KR), filed on Nov. 26, 2018.
Prior Publication US 2022/0376234 A1, Nov. 24, 2022
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 4/62 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/366 (2013.01) [H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 4/62 (2013.01); H01M 4/628 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 6 Claims
 
1. A cathode active material for a lithium secondary battery, comprising:
a lithium metal oxide particle represented by General Formula 1;
a metal oxide coating layer containing at least one selected from a group consisting of Al2O3, ZrO2 and TiO2 on at least a portion of the lithium metal oxide particle; and
an organic poly-phosphate forming a coating layer on at least a portion of the lithium metal oxide coating layer or an organic poly-phosphonate forming a coating layer on at least a portion of the metal oxide coating layer;
wherein the coating layer including the organic poly-phosphate or the organic poly-phosphonate is coupled to the lithium metal oxide particle by an organic ligand bond or an organic metal complex bond,
wherein, an ion fragment peak of PO+ is detected by a Time of Flight Secondary Ion Mass Spectrometry (TOF-SIMS) analysis of a surface of the cathode active material,
wherein the organic poly-phosphate is derived from an organic poly-phosphate compound represented by Structural Formula 1 below or an organic poly-phosphate salt thereof, and the organic poly-phosphonate is derived from an organic poly-phosphonate compound represented by Structural Formula 2 below or an organic poly-phosphonate salt thereof:
LixNiyM1-yO2  [General Formula 1]
wherein, in the General Formula 1 above, 0.95≤x≤1.08, 0.5≤y≤1, and M is at least one element selected from a group consisting of Co and Mn,

OG Complex Work Unit Chemistry
wherein, in the Structural Formulae 1 and 2 above, m is an integer from 2 to 20, R1 represents a C1-C10 hydrocarbon group substituted with a substituent group or an unsubstituted C1-C10 hydrocarbon group, and the substituent group includes halogen, a cyano group, a hydroxyl group, a phosphoric acid group, a carboxylic group or a salt thereof, or
wherein, in the Structural Formulae 1 and 2 above, m is an integer from 2 to 20, R1 represents a C1-C10 hydrocarbon group substituted with a substituent group, wherein the substituent group includes at least one selected from a group consisting of a carbon-carbon double bond, —O—, —S—, —CO—, —OCO—, —SO—, —CO—O—, —O—CO—O—, —S—CO—, —S—CO—O—, —CO—NH—, —NH—CO—O—, —NR′—,

OG Complex Work Unit Chemistry
—S—S— and —SO2—, and R′ is hydrogen or a C1-C8 alkyl group.