US 12,315,913 B2
Negative electrode active material, preparation method thereof, negative electrode including the negative electrode active material, and secondary battery including the negative electrode
Su Min Lee, Daejeon (KR); Yong Ju Lee, Daejeon (KR); Rae Hwan Jo, Daejeon (KR); and Dong Hyuk Kim, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
Filed on Feb. 8, 2023, as Appl. No. 18/107,263.
Application 18/107,263 is a division of application No. 16/772,585, granted, now 11,605,811, previously published as PCT/KR2019/001297, filed on Jan. 30, 2019.
Claims priority of application No. 10-2018-0011185 (KR), filed on Jan. 30, 2018.
Prior Publication US 2023/0197938 A1, Jun. 22, 2023
Int. Cl. H01M 4/1395 (2010.01); H01M 4/04 (2006.01); H01M 4/1397 (2010.01); H01M 4/36 (2006.01); H01M 4/485 (2010.01); H01M 4/58 (2010.01); C01B 33/06 (2006.01); C01B 33/113 (2006.01); C01B 33/24 (2006.01); C01B 33/32 (2006.01)
CPC H01M 4/1395 (2013.01) [H01M 4/0471 (2013.01); H01M 4/1397 (2013.01); H01M 4/366 (2013.01); H01M 4/485 (2013.01); H01M 4/5825 (2013.01); C01B 33/06 (2013.01); C01B 33/113 (2013.01); C01B 33/24 (2013.01); C01B 33/32 (2013.01); H01M 4/58 (2013.01)] 6 Claims
 
1. A method for preparing a negative electrode active material, the method comprising:
mixing a core comprising an SiOx (0<x<2) particle and magnesium powder to form a first mixture;
subjecting the first mixture to a first heat treatment forming a shell comprising magnesium silicate and SiOx formed on a surface of the core comprising SiOx, wherein the magnesium silicate comprises at least one selected from the group consisting of Mg2SiO4, and MgSiO3 to produce a core-shell structure;
mixing the core-shell structure and lithium powder to form a second mixture; and
subjecting the second mixture to a second heat treatment creating a lithium-containing compound formed in the core comprising the SiOx,
wherein the lithium-containing compound comprises at least one selected from the group consisting of lithium silicate and lithium silicide,
wherein the lithium silicate comprises at least one selected from the group consisting of Li2Si2O5, Li2SiO3, and Li4SiO4 and the lithium silicide comprises LiySi (2<y<5).