US 11,923,540 B2
Lithium-doped silicon-based oxide negative electrode active material, method of preparing the same, and negative electrode and secondary battery including the same
Eunjun Park, Daejeon (KR); Joon-Sup Kim, Daejeon (KR); Gwi Ok Park, Daejeon (KR); Hansu Kim, Seoul (KR); Donghan Youn, Namyangju-si (KR); and Dong Jae Chung, Seoul (KR)
Assigned to SK On Co., Ltd., Seoul (KR)
Filed by SK On Co., Ltd., Seoul (KR)
Filed on Jul. 23, 2021, as Appl. No. 17/383,619.
Claims priority of application No. 10-2020-0094454 (KR), filed on Jul. 29, 2020.
Prior Publication US 2022/0037656 A1, Feb. 3, 2022
Int. Cl. H01M 4/48 (2010.01); H01M 4/04 (2006.01); H01M 4/58 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/483 (2013.01) [H01M 4/0471 (2013.01); H01M 4/5825 (2013.01); H01M 10/0525 (2013.01); H01M 2004/027 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A negative electrode active material comprising: negative electrode active material particles including a silicon oxide represented by SiOx, where 0<x≤2, and at least one lithium silicate selected from Li2SiO3, Li2Si2O5, and Li4SiO4 in at least a part of the silicon oxide,
wherein the negative electrode active material has a content of a nitrogen element according to X-ray photoelectron spectroscopy (XPS) of 1.45 atom % or less, and
wherein the negative electrode active material particles include 70 to 85 wt % of the lithium silicate with respect to a total weight.