US 12,119,476 B2
Secondary battery electrode including mixture layer of double layer structure containing active materials of different particle diameters, and method for manufacturing the same
Dae Jin Lee, Daejeon (KR); Dong Hwi Kim, Daejeon (KR); Jin Tae Hwang, Daejeon (KR); Hyeong Il Kim, Daejeon (KR); Seul Ki Chae, Daejeon (KR); Wang Mo Jung, Daejeon (KR); and Dong Hun Lee, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/278,233
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Jul. 29, 2020, PCT No. PCT/KR2020/009990
§ 371(c)(1), (2) Date Mar. 19, 2021,
PCT Pub. No. WO2021/096025, PCT Pub. Date May 20, 2021.
Claims priority of application No. 10-2019-0145833 (KR), filed on Nov. 14, 2019.
Prior Publication US 2022/0310984 A1, Sep. 29, 2022
Int. Cl. H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 4/131 (2010.01); H01M 4/62 (2006.01); H01M 10/052 (2010.01)
CPC H01M 4/0404 (2013.01) [H01M 4/0435 (2013.01); H01M 4/131 (2013.01); H01M 4/623 (2013.01); H01M 10/052 (2013.01); H01M 2004/028 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An electrode for a secondary battery, comprising:
a current collector layer;
a lower mixture layer disposed on one or both surfaces of the current collector layer and including a first active material; and
an upper mixture layer disposed on a surface of the lower mixture layer which is opposite to a surface of the lower mixture layer that comes in contact with the current collector layer, and including a second active material,
wherein the second active material includes particles having diameters within a first particle diameter range and particles having diameters within a third particle diameter range,
wherein the first active material includes particles having diameters within a second particle diameter range and particles having diameters within the third particle diameter range,
wherein following conditions 1 and 2 are satisfied:
D1>D2>D3  [Condition 1]
D1−D3≥5 (μm)  [Condition 2]
wherein in the conditions 1 and 2,
D1 is an average particle diameter of the particles having diameters within the first particle diameter range,
D2 is an average particle diameter of the particles having diameters within the second particle diameter range, and
D3 is an average particle diameter of the particles having diameters within the third particle diameter range, and
wherein in the upper mixture layer, a content ratio of the particles having diameters within the first particle diameter range to the particles having diameters within the third particle diameter range is in a range of 6:4 to 9:1 by weight, and
a concentration of the particles having diameters within the first particle diameter range is higher in the upper mixture layer than in the lower mixture layer.