	US 12,074,312 B2
	Negative electrode for lithium secondary battery and method of manufacturing the same
Eun Jun Park, Daejeon (KR); Gwi Ok Park, Daejeon (KR); Hyo Shik Kil, Daejeon (KR); and In Ae Lee, Daejeon (KR)
Assigned to SK ON CO., LTD., Seoul (KR)
Filed by SK On Co., Ltd., Seoul (KR)
Filed on Jun. 21, 2023, as Appl. No. 18/338,348.
Claims priority of application No. 10-2022-0076674 (KR), filed on Jun. 23, 2022.
Prior Publication US 2023/0420642 A1, Dec. 28, 2023
Int. Cl. H01M 4/134 (2010.01); H01M 4/139 (2010.01); H01M 10/052 (2010.01); B82Y 30/00 (2011.01); H01M 4/02 (2006.01)

CPC H01M 4/134 (2013.01) [H01M 4/139 (2013.01); H01M 10/052 (2013.01); B82Y 30/00 (2013.01); H01M 2004/027 (2013.01)]

9 Claims

1. A negative electrode for a lithium secondary battery comprising a silicon-based negative electrode active material including iron and aluminum,

wherein in ICP analysis of a negative electrode active material layer including the silicon-based negative electrode active material, contents of elements in the negative electrode active material layer satisfy the following Relations (1) to (3):

A/(B²+C²)≤4,500 ppm⁻¹, (1)

5 ppm≤B≤1,500 ppm, (2)

2.5 ppm≤C≤1,000 ppm, (3)

wherein A is a Li content in ppm, B is an Fe content in ppm, and C is an Al content in ppm, based on the total weight of the negative electrode active material layer,

wherein in Relation (1), 5,000 ppm≤A≤150,000 ppm is satisfied.