US 11,929,497 B2
Negative electrode active material, negative electrode including the negative electrode active material, secondary battery including the negative electrode, and method of preparing the negative electrode active material
Dong Hyuk Kim, Daejeon (KR); Eun Kyung Kim, Daejeon (KR); Yong Ju Lee, Daejeon (KR); Rae Hwan Jo, Daejeon (KR); and Jung Hyun Choi, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Filed by LG CHEM, LTD., Seoul (KR)
Filed on Nov. 1, 2019, as Appl. No. 16/671,487.
Application 16/671,487 is a continuation of application No. PCT/KR2018/005228, filed on May 4, 2018.
Claims priority of application No. 10-2017-0057050 (KR), filed on May 4, 2017; and application No. 10-2018-0051920 (KR), filed on May 4, 2018.
Prior Publication US 2020/0067088 A1, Feb. 27, 2020
Int. Cl. H01M 4/583 (2010.01); H01M 4/131 (2010.01); H01M 4/134 (2010.01); H01M 4/1395 (2010.01); H01M 4/38 (2006.01); H01M 4/485 (2010.01); H01M 4/587 (2010.01); H01M 4/62 (2006.01); H01M 10/052 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/386 (2013.01) [H01M 4/131 (2013.01); H01M 4/134 (2013.01); H01M 4/1395 (2013.01); H01M 4/485 (2013.01); H01M 4/587 (2013.01); H01M 4/625 (2013.01); H01M 10/052 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A negative electrode active material particle comprising:
a silicon-based compound comprising SiOx, wherein 0.5<x<1.3;
an amorphous carbon layer disposed on the silicon-based compound;
a graphene layer disposed on the amorphous carbon layer; and
at least one cavity present on at least a portion of a surface of the amorphous carbon layer and positioned between the amorphous carbon layer and the graphene layer,
wherein the graphene layer has a thickness of 0.5 nm to 200 nm,
wherein the silicon-based compound has an average particle diameter (D50) in a range of 5 μm to 20 μm, and
wherein an outer surface of the graphene layer is spherical.