US 12,034,164 B2
Negative electrode for secondary battery, and secondary battery including same
Kwang Ho Jeong, Daejeon (KR); Hyun Joong Jang, Daejeon (KR); and Da Bin Chung, Daejeon (KR)
Assigned to SK On Co., Ltd., Seoul (KR)
Filed by SK ON CO., LTD., Seoul (KR)
Filed on Oct. 27, 2021, as Appl. No. 17/511,744.
Claims priority of application No. 10-2020-0142111 (KR), filed on Oct. 29, 2020.
Prior Publication US 2022/0140342 A1, May 5, 2022
Int. Cl. H01M 4/583 (2010.01); H01M 4/02 (2006.01); H01M 4/48 (2010.01); H01M 4/62 (2006.01)
CPC H01M 4/583 (2013.01) [H01M 4/48 (2013.01); H01M 4/622 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 11 Claims
 
1. A negative electrode for a secondary battery, comprising:
a current collector;
a first negative electrode active material layer formed on the current collector and containing a first active material; and
a second negative electrode active material layer formed on the first negative electrode active material layer and containing a second active material,
wherein the second active material is a bimodal active material comprising small particles and large particles having different particle sizes,
a particle size (D2) of the second active material is smaller than a particle size (D1) of the first active material, and
the particle size of the second active material is an average particle size based on a weight ratio of the small particles and the large particles wherein at least one of the first and second negative electrode active material layers further comprises a silicon oxide-based active material (SiOx (0<x<2)),
wherein the silicon oxide-based active materials in the thirst and second negative electrode active material layers satisfy the following Relational Equation 1:
W2>2*W1  [Relational Equation 1]
wherein W1 is a content of the silicon oxide-based active material in the first negative electrode active material layer, W2 is a content of the silicon oxide-based active material in the second negative electrode active material layer.