US 11,837,717 B2
Negative electrode active material for lithium secondary battery and method of preparing the same
Hyun Chul Kim, Daejeon (KR); Yong Ju Lee, Daejeon (KR); and Eun Kyung Kim, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 15/577,233
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Sep. 23, 2016, PCT No. PCT/KR2016/010682
§ 371(c)(1), (2) Date Nov. 27, 2017,
PCT Pub. No. WO2017/052281, PCT Pub. Date Mar. 30, 2017.
Claims priority of application No. 10-2015-0135474 (KR), filed on Sep. 24, 2015.
Prior Publication US 2018/0151874 A1, May 31, 2018
Int. Cl. H01M 4/36 (2006.01); H01M 4/587 (2010.01); H01M 4/134 (2010.01); H01M 10/052 (2010.01); H01M 4/38 (2006.01); H01M 4/48 (2010.01); H01M 10/0525 (2010.01); H01M 4/62 (2006.01); B01J 13/04 (2006.01); B01J 13/20 (2006.01); H01M 4/133 (2010.01)
CPC H01M 4/366 (2013.01) [B01J 13/04 (2013.01); B01J 13/20 (2013.01); H01M 4/133 (2013.01); H01M 4/134 (2013.01); H01M 4/36 (2013.01); H01M 4/38 (2013.01); H01M 4/386 (2013.01); H01M 4/483 (2013.01); H01M 4/587 (2013.01); H01M 4/625 (2013.01); H01M 10/052 (2013.01); H01M 10/0525 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A negative electrode active material, consisting of:
particles represented by SiOa (0<a<1), wherein in the particles, a ratio of crystalline silicon and crystalline silica contained therein is expressed as 1−(a/2):(a/2), and wherein the particles represented by SiOa (0<a<1) consist of crystalline silicon and crystalline silica, and no amorphous silicon is present; and
wherein each particle has a carbon coating layer distributed on a surface of each particle,
wherein each particle has a bimodal pore structure inside each particle including mesopores and macropores,
wherein a specific surface area of the negative electrode active material is in a range of 1 m2/g to 20 m2/g, and
wherein each particle has the bimodal pore structure formed uniformly from an inner central portion to a surface portion of each particle.