US 12,444,732 B2
Anode including graphite and silicon-based material having different diameters and lithium secondary battery including the same
Junghyun Choi, Daejeon (KR); Hyeon Min Song, Daejeon (KR); Joo Hwan Sung, Daejeon (KR); Han Sol Park, Daejeon (KR); Minsu Cho, Daejeon (KR); Sunghae Park, Daejeon (KR); Jingoo Kwak, Daejeon (KR); Younguk Park, Daejeon (KR); Sue Jin Kim, Daejeon (KR); and Jinsu Jang, Daejeon (KR)
Assigned to LG ENERGY SOLUTION LTD., Seoul (KR)
Appl. No. 17/047,593
Filed by LG ENERGY SOLUTION LTD., Seoul (KR)
PCT Filed Jun. 26, 2019, PCT No. PCT/KR2019/007740
§ 371(c)(1), (2) Date Oct. 14, 2020,
PCT Pub. No. WO2020/085610, PCT Pub. Date Apr. 30, 2020.
Claims priority of application No. 10-2018-0127486 (KR), filed on Oct. 24, 2018; and application No. 10-2019-0072305 (KR), filed on Jun. 18, 2019.
Prior Publication US 2021/0151744 A1, May 20, 2021
Int. Cl. H01M 4/36 (2006.01); H01M 4/02 (2006.01); H01M 4/48 (2010.01); H01M 4/587 (2010.01); H01M 10/0525 (2010.01)
CPC 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)] 8 Claims
 
1. An anode for a lithium secondary battery, wherein an anode material layer is formed on at least one surface of an anode current collector, and the anode material layer comprises large-particle graphite, a small-particle silicon-based material, fine-particle graphite, and a carbon nanotube, and the large-particle graphite, the small-particle silicon-based material, and the fine-particle graphite satisfy the following ratios:
D1:D2=1:0.24-0.4 and D1:D3=1:0.16-0.3; or D1:D2=1:0.2-0.4 and D2:D3=1:0.33-0.4,
wherein D1 is an average diameter D50 of the large-particle graphite selected in the range of 5 to 25 μm, D2 is an average diameter D50 of the small-particle silicon-based material, and D3 is an average diameter D50 of the fine-particle graphite,
wherein the small-particle silicon-based material comprises at least one selected from the group consisting of SiOx (0<x<2) and metal-doped SiOx (0<x<2), and
wherein the anode material layer comprises 60 to 95.5 wt % of the large-particle graphite, 0.5 to 30 wt % of the small-particle silicon-based material, 0.5 to 20 wt % of the fine-particle graphite, and 0.005 to 20 wt % of the carbon nanotube, based on a total weight of the large-particle graphite, the small-particle silicon-based material, the fine-particle graphite and the carbon nanotube.