	US 11,990,610 B2
	Negative electrode active material for secondary battery and method of manufacturing the same
Joon Hyung Moon, Daejeon (KR); Eun Jun Park, Daejeon (KR); and Ju Ho Chung, Daejeon (KR)
Assigned to SK ON CO., LTD., Seoul (KR)
Filed by SK ON CO., LTD., Seoul (KR)
Filed on Mar. 31, 2023, as Appl. No. 18/194,508.
Claims priority of application No. 10-2022-0040992 (KR), filed on Apr. 1, 2022.
Prior Publication US 2023/0402586 A1, Dec. 14, 2023
Int. Cl. H01M 4/48 (2010.01); H01M 4/04 (2006.01); H01M 4/36 (2006.01); H01M 4/485 (2010.01); H01M 4/58 (2010.01); H01M 4/60 (2006.01); H01M 4/62 (2006.01); H01M 10/052 (2010.01); H01M 4/02 (2006.01)

CPC H01M 4/366 (2013.01) [H01M 4/0471 (2013.01); H01M 4/364 (2013.01); H01M 4/485 (2013.01); H01M 4/5825 (2013.01); H01M 4/602 (2013.01); H01M 4/625 (2013.01); H01M 10/052 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)]

20 Claims

1. A negative electrode active material for a secondary battery comprising a core-shell composite including:

a core including a silicon oxide (SiO_x, 0<x≤2) and a metal silicate in at least a part of the silicon oxide; and

a shell outside the core and including a metal-substituted organic compound,

wherein the metal of the metal silicate and the substituted metal of the organic compound are independent of each other, wherein each of the metal of the metal silicate and the substituted metal of the organic compound includes an alkali metal or an alkaline earth metal,

wherein a concentration of the substituted metal on an outer surface of the core-shell composite is lower than a concentration of the substituted metal in an interface between the core and the shell, based on a cross-section through the center of the core-shell composite.