US 11,901,540 B2
Composite anode active material, method of preparing the same, and lithium secondary battery including anode including composite anode active material
Jae Phil Cho, Ulsan (KR); Yeong Uk Son, Ulsan (KR); Ji Young Ma, Ulsan (KR); and Nam Hyung Kim, Ulsan (KR)
Assigned to UNIST(ULSAN NATIONAL INSTITUTE OF SCIENCE AND TECHNOLOGY), Ulsan (KR)
Filed by UNIST(ULSAN NATIONAL INSTITUTE OF SCIENCE AND TECHNOLOGY), Ulsan (KR)
Filed on Mar. 17, 2021, as Appl. No. 17/204,707.
Application 17/204,707 is a division of application No. 16/036,761, filed on Jul. 16, 2018, granted, now 10,985,370.
Claims priority of application No. 10-2017-0096382 (KR), filed on Jul. 28, 2017; and application No. 10-2018-0064476 (KR), filed on Jun. 4, 2018.
Prior Publication US 2021/0202944 A1, Jul. 1, 2021
Int. Cl. H01M 4/04 (2006.01); H01M 4/133 (2010.01); H01M 4/134 (2010.01); H01M 4/36 (2006.01); H01M 4/587 (2010.01); H01M 4/38 (2006.01); H01M 4/1393 (2010.01); H01M 4/1395 (2010.01); H01M 4/583 (2010.01); H01M 10/0525 (2010.01); H01M 4/62 (2006.01); H01M 4/02 (2006.01); H01M 4/66 (2006.01); C01B 32/184 (2017.01); H01M 50/44 (2021.01)
CPC H01M 4/0419 (2013.01) [H01M 4/0471 (2013.01); H01M 4/0492 (2013.01); H01M 4/133 (2013.01); H01M 4/134 (2013.01); H01M 4/1393 (2013.01); H01M 4/1395 (2013.01); H01M 4/366 (2013.01); H01M 4/386 (2013.01); H01M 4/587 (2013.01); C01B 32/184 (2017.08); H01M 4/364 (2013.01); H01M 4/583 (2013.01); H01M 4/623 (2013.01); H01M 4/661 (2013.01); H01M 10/0525 (2013.01); H01M 50/44 (2021.01); H01M 2004/028 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method of preparing a composite anode active material, the method comprising:
spray-drying a solution including a carbon source and a pore-forming agent to obtain a composite structure;
etching the composite structure to form a porous composite structure;
providing a non-carbonaceous material to the porous composite structure to form a first coating layer on a surface of the porous composite structure; and
providing a carbon precursor to the first coating layer to form a second coating layer comprising a carbonaceous material on the first coating layer arranged on the surface of the porous composite,
wherein the pore-forming agent is a silicon oxide, and
wherein the porous composite structure has a plurality of pores, and the pores have an average pore diameter of about 200 nm to about 300 nm.