US 11,942,640 B2
Negative electrode active material for lithium secondary battery and lithium secondary battery comprising the same
Il-Geun Oh, Daejeon (KR); Dong-Hyuk Kim, Daejeon (KR); and Yong-Ju Lee, Daejeon (KR)
Assigned to LG Energy Solution, Ltd., Seoul (KR)
Appl. No. 17/420,592
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Jan. 20, 2020, PCT No. PCT/KR2020/000961
§ 371(c)(1), (2) Date Jul. 2, 2021,
PCT Pub. No. WO2020/149724, PCT Pub. Date Jul. 23, 2020.
Claims priority of application No. 10-2019-0007121 (KR), filed on Jan. 18, 2019.
Prior Publication US 2022/0077467 A1, Mar. 10, 2022
Int. Cl. H01M 4/58 (2010.01); H01M 4/04 (2006.01); H01M 4/36 (2006.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/5825 (2013.01) [H01M 4/0471 (2013.01); H01M 4/364 (2013.01); H01M 10/0525 (2013.01); H01M 2004/027 (2013.01)] 10 Claims
 
1. A negative electrode active material for a lithium secondary battery comprising:
a silicon-silicon oxide-magnesium silicate composite comprising:
a silicon oxide (SiOx, 0<x≤2) matrix; and
silicon (Si) crystal grains, MgSiO3 crystal grains and Mg2SiO4 crystal grains present in a silicon oxide matrix;
wherein the MgSiO3 crystal grains have a crystal size of 5-30 nm and the Mg2SiO4 crystal grains have a crystal size of 20-100 nm in the silicon-silicon oxide-magnesium silicate composite, and
a weight content ratio of MgSiO3 crystal grains to Mg2SiO4 crystal grains is 2:1-1:1.