US 12,438,144 B2
Anode active material for lithium secondary battery, method for preparing same, and lithium secondary battery comprising same
Yong Jung Kim, Pohang-si (KR); Seung Jae You, Pohang-si (KR); Eun-Tae Kang, Pohang-si (KR); and Jung Gyu Woo, Pohang-si (KR)
Assigned to POSCO HOLDINGS INC., Seoul (KR)
Appl. No. 17/298,404
Filed by POSCO, Pohang-si (KR); and RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY, Pohang-si (KR)
PCT Filed Aug. 13, 2019, PCT No. PCT/KR2019/010322
§ 371(c)(1), (2) Date May 28, 2021,
PCT Pub. No. WO2020/111446, PCT Pub. Date Jun. 4, 2020.
Claims priority of application No. 10-2018-0152144 (KR), filed on Nov. 30, 2018.
Prior Publication US 2021/0408527 A1, Dec. 30, 2021
Int. Cl. H01M 4/36 (2006.01); C01B 32/21 (2017.01); C01B 33/02 (2006.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 4/133 (2010.01); H01M 4/134 (2010.01); H01M 4/38 (2006.01); H01M 4/587 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/362 (2013.01) [C01B 32/21 (2017.08); C01B 33/02 (2013.01); H01M 4/0433 (2013.01); H01M 4/0471 (2013.01); H01M 4/133 (2013.01); H01M 4/134 (2013.01); H01M 4/386 (2013.01); H01M 4/587 (2013.01); H01M 10/0525 (2013.01); H01M 2004/027 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method of preparing an anode active material for a lithium secondary battery, comprising:
preparing a porous silicon-carbon mixed powder by mixing nano-silicon particles, graphite particles, and pitch particles by dry milling;
adding the porous silicon-carbon mixed powder and a binder to distilled water to prepare a mixed solution;
spray-drying the mixed solution to prepare primary particles;
inserting the primary particles into a mold and press-molding to produce secondary particles;
heat-treating the secondary particles to produce heat-treated secondary particles; and
pulverizing and sieving the heat-treated secondary particles,
wherein, in the preparing of the porous silicon-carbon mixed powder, the pitch particles are included in an amount of greater than or equal to 30 wt % based on 100 wt % of the porous silicon-carbon mixed powder.