US 12,107,267 B2
Negative active material composite for rechargeable lithium battery, method of preparing the same, and negative electrode and rechargeable lithium battery including the same
Changsu Shin, Yongin-si (KR); Young-Min Kim, Yongin-si (KR); Soonho Ahn, Yongin-si (KR); Jaehou Nah, Yongin-si (KR); and Jaemyung Kim, Yongin-si (KR)
Assigned to Samsung SDI Co., Ltd., Yongin-si (KR)
Filed by Samsung SDI Co., Ltd., Yongin-si (KR)
Filed on Apr. 9, 2020, as Appl. No. 16/844,968.
Application 16/844,968 is a continuation in part of application No. 16/700,132, filed on Dec. 2, 2019, abandoned.
Claims priority of application No. 10-2019-0024133 (KR), filed on Feb. 28, 2019; and application No. 10-2020-0015218 (KR), filed on Feb. 7, 2020.
Prior Publication US 2020/0280062 A1, Sep. 3, 2020
Int. Cl. H01M 4/00 (2006.01); H01M 4/04 (2006.01); H01M 4/134 (2010.01); H01M 4/1395 (2010.01); H01M 4/36 (2006.01); H01M 4/38 (2006.01); H01M 4/66 (2006.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/386 (2013.01) [H01M 4/0471 (2013.01); H01M 4/134 (2013.01); H01M 4/1395 (2013.01); H01M 4/364 (2013.01); H01M 4/663 (2013.01); H01M 4/667 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A negative active material composite,
comprising: a core and a coating layer around the core,
the core comprising amorphous carbon and silicon nanoparticles,
the silicon nanoparticles having an aspect ratio of about 2 to about 8,
the coating layer comprising amorphous carbon,
an average distance between adjacent silicon nanoparticles being less than or equal to about 70 nm,
a total pore volume of pores in the negative active material composite being less than or equal to about 3.0×10−2 cm3/g,
the negative active material composite comprises about 60 wt % to about 80 wt % of the silicon nanoparticles and about 20 wt % to about 40 wt % of the amorphous carbon, based on a total weight of the negative active material composite,
the negative active material composite has a BET specific surface area of less than 10 m2/g, and
an average pore size of the negative active material composite is less than or equal to about 200 nm.