US 12,463,209 B2
Negative electrode and secondary battery including the same
Se Mi Park, Daejeon (KR); Yong Ju Lee, Daejeon (KR); Su Min Lee, Daejeon (KR); and Dong Hyuk Kim, Daejeon (KR)
Assigned to LG ENERGY SOLUTION LTD., Seoul (KR)
Appl. No. 17/771,107
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Dec. 17, 2020, PCT No. PCT/KR2020/018532
§ 371(c)(1), (2) Date Apr. 22, 2022,
PCT Pub. No. WO2021/125825, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 10-2019-0169171 (KR), filed on Dec. 17, 2019.
Prior Publication US 2022/0367864 A1, Nov. 17, 2022
Int. Cl. H01M 4/48 (2010.01); H01M 4/02 (2006.01); H01M 4/131 (2010.01); H01M 4/134 (2010.01); H01M 4/36 (2006.01); H01M 4/38 (2006.01); H01M 4/58 (2010.01); H01M 4/62 (2006.01); H01M 10/052 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/483 (2013.01) [H01M 4/5825 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 4/131 (2013.01); H01M 4/134 (2013.01); H01M 4/362 (2013.01); H01M 4/364 (2013.01); H01M 4/366 (2013.01); H01M 4/386 (2013.01); H01M 4/625 (2013.01); H01M 10/052 (2013.01); H01M 10/0525 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A negative electrode comprising:
a current collector; and
a negative electrode active material layer disposed on the current collector,
wherein the negative electrode active material layer includes a conductive material, a negative electrode active material, and a binder,
the negative electrode active material includes a silicon-based active material having a convexity of 0.8 or more and 0.97 or less as measured using a particle shape analyzer, and
the convexity is defined by the following Formula 1:
Convexity=Convex hull perimeter/Actual perimeter  Formula 1
wherein the convex hull perimeter is a total length of sides of the smallest convex polygon that contains all surface roughness points of particles of the silicon-based active material measured from a two-dimensional image thereof.