US 12,074,320 B2
Negative electrode active material for secondary battery and manufacturing method thereof
Seung Chul Park, Yuseong-gu Daejeon (KR); Eui Joon Song, Daedeok-gu Daejeon (KR); Young Tai Cho, Seo-gu Daejeon (KR); and Jee Hye Park, Yuseong-gu Daejeon (KR)
Assigned to Nexeon Limited, Oxfordshire (GB)
Filed by NEXEON LTD., Oxfordshire (GB)
Filed on Jan. 18, 2023, as Appl. No. 18/098,415.
Application 18/098,415 is a continuation of application No. 16/326,873, granted, now 11,588,152, previously published as PCT/KR2017/009218, filed on Aug. 23, 2017.
Claims priority of application No. 10-2016-0106852 (KR), filed on Aug. 23, 2016.
Prior Publication US 2023/0155119 A1, May 18, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/38 (2006.01); C01B 33/021 (2006.01); H01M 4/02 (2006.01); H01M 4/134 (2010.01); H01M 4/1395 (2010.01); H01M 4/36 (2006.01); H01M 10/052 (2010.01)
CPC H01M 4/386 (2013.01) [C01B 33/021 (2013.01); H01M 4/134 (2013.01); H01M 4/1395 (2013.01); H01M 4/366 (2013.01); H01M 10/052 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A negative electrode active material for a secondary battery, wherein the negative electrode active material comprises silicon-based primary particles,
a particle size distribution of the silicon-based primary particles is 50 nm≤D10<80 nm, 80 nm≤D50 (median particle diameter)≤100 nm, and 105 nm<D90≤150 nm,
the particle size distribution width (D90−D10)/D50 of the silicon-based primary particles is 1.0 or less,
circularity of the silicon-based primary particles is in a range of 0.6 to 0.8, wherein the circularity is defined as:

OG Complex Work Unit Math
where A is a projected area of the two-dimensionally projected silicon-based primary particles, and P is a perimeter of the two-dimensionally projected silicon-based primary particles, and
wherein the silicon-based primary particles comprise a silicon particle core and a silicon oxide layer formed on the core.