US 12,381,204 B2
Negative electrode for lithium secondary battery and lithium secondary battery including the same
Jun Hee Han, Daejeon (KR); Hyo Mi Kim, Daejeon (KR); Moon Sung Kim, Daejeon (KR); Sang Baek Ryu, Daejeon (KR); Seung Hyun Yook, Daejeon (KR); and Hwan Ho Jang, Daejeon (KR)
Assigned to SK On Co., Ltd., Seoul (KR)
Filed by SK On Co., Ltd., Seoul (KR)
Filed on Jun. 15, 2021, as Appl. No. 17/347,742.
Claims priority of application No. 10-2020-0073050 (KR), filed on Jun. 16, 2020.
Prior Publication US 2021/0391570 A1, Dec. 16, 2021
Int. Cl. H01M 4/36 (2006.01); H01M 4/02 (2006.01); H01M 4/133 (2010.01); H01M 4/48 (2010.01); H01M 4/587 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/366 (2013.01) [H01M 4/133 (2013.01); H01M 4/364 (2013.01); H01M 4/483 (2013.01); H01M 4/587 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 9 Claims
 
1. A negative electrode for a lithium secondary battery, comprising:
a current collector;
a first negative electrode active material layer disposed on the current collector and including a first graphite-based active material containing artificial graphite and natural graphite, and a first silicon-based active material; and
a second negative electrode active material layer disposed on the first negative electrode active material layer and including a second graphite-based active material containing artificial graphite and natural graphite, and a second silicon-based active material,
wherein the first graphite-based active material has a content of the artificial graphite equal to or less than that of the natural graphite, and the second graphite-based active material has a content of the artificial graphite greater than that of the natural graphite,
wherein the second graphite-based active material contains the artificial graphite and the natural graphite in a weight ratio of 80:20 to 60:40, wherein a thickness ratio between the first negative electrode active material layer and the second negative electrode active material layer is greater than 3:7 and equal to or less than 5:5, and
further comprising a third negative electrode active material layer disposed on the second negative electrode active material layer and including a third graphite-based active material containing artificial graphite,
wherein the third graphite-based active material is a granular-type artificial graphite.