US 12,249,703 B2
Negative electrode active material for lithium secondary battery and lithium secondary battery comprising the same
Su-Min Lee, Daejeon (KR); Je-Young Kim, Daejeon (KR); Sun-Young Shin, Daejeon (KR); and Yong-Ju Lee, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/042,514
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Jun. 12, 2019, PCT No. PCT/KR2019/007098
§ 371(c)(1), (2) Date Sep. 28, 2020,
PCT Pub. No. WO2019/240496, PCT Pub. Date Dec. 19, 2019.
Claims priority of application No. 10-2018-0067287 (KR), filed on Jun. 12, 2018.
Prior Publication US 2021/0028438 A1, Jan. 28, 2021
Int. Cl. H01M 4/131 (2010.01); H01M 4/133 (2010.01); H01M 4/134 (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 4/131 (2013.01) [H01M 4/133 (2013.01); H01M 4/134 (2013.01); H01M 4/366 (2013.01); H01M 4/386 (2013.01); H01M 4/66 (2013.01); H01M 10/0525 (2013.01); H01M 2004/027 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A negative electrode active material for a lithium secondary battery, comprising:
silicon oxide particles and graphite,
wherein the silicon oxide particles have a full width at half maximum peak ranging between 3 and 5 μm in a particle size distribution on a volume percent basis and the silicon oxide particles have an average particle size (D50) of 1 μm to 20 μm,
wherein the silicon oxide particles comprise doped silicon oxide particles doped with a metal of lithium, magnesium, calcium, or aluminum,
wherein a weight ratio of graphite to silicon oxide is 99:1 to 70:30,
wherein the graphite comprises natural graphite, and
wherein the full width at half maximum peak is calculated by fitting the particle size distribution curve using Lorentzian distribution, and determining a width at one-half of a peak in the distribution curve of a single peak.