Lithium-Doped Silicon-Based Oxide Negative Electrode Active Material, Method of Preparing the Same, and Negative Electrode and Secondary Battery Including the Same

Patent metadata

Field	Value
Publication number	US-2026081141-A1
Application number	US-202519393857-A
Country	US
Kind code	A1
Filing date	Nov 19, 2025
Priority date	Jul 29, 2020
Publication date	Mar 19, 2026
Grant date	—

Abstract

Provided are a negative electrode active material which includes negative electrode active material particles which includes a silicon oxide (SiO x , 0<x≤2); and at least one lithium silicate selected from Li 2 SiO 3 , Li 2 Si 2 O 5 , and Li 4 SiO 4 in at least a part of the silicon oxide. A signal generated in a region of 200 to 600 cm −1 according to a Raman spectrum is subjected to deconvolution into three peaks, which are set to peak A, peak B, and peak C from lowest to highest of an absolute value of a wavenumber. Also disclosed are a method of preparing the same, and a negative electrode and a lithium secondary battery including the negative electrode active material.

First claim

What is claimed is:

1 . A method of preparing a negative electrode active material, the method comprising:
preparing silicon compound particles; and mixing the silicon compound particles and a Li precursor and performing heat treatment to prepare negative electrode active material particles including a silicon oxide (SiO x , 0<x≤2) and at least one lithium silicate selected from Li 2 SiO 3 , Li 2 Si 2 O 5 , and Li 4 SiO 4 in at least a part of the silicon oxide, wherein the negative electrode active material comprises: the negative electrode active material particles including a silicon oxide (SiO x , 0<x≤2) and at least one lithium silicate selected from Li 2 SiO 3 , Li 2 Si 2 O 5 , and Li 4 SiO 4 in at least a part of the silicon oxide, and wherein when a signal generated in a region of 200 to 600 cm −1 according to a Raman spectrum is subjected to deconvolution into three peaks, which are set to peak A, peak B, and peak C from lowest to highest of an absolute value of a wavenumber, the negative electrode active material particles satisfy the following Relation 1:

0.3
≤

D
⁡
(

=

C
′

/

B
′

-

C
″

/

B
″

)

≤

1
.
0

[

Relation
⁢

1

]

wherein
D is a difference value of a peak area ratio (C″/B″) from a peak intensity ratio (C′/B′),
the peak intensity ratio (C′/B′) is a ratio of an intensity of the peak C to an intensity of the peak B, and
the peak area ratio (C″/B″) is a ratio of an area of the peak C to an area of the peak B.

2 . The method of claim 1 , wherein the silicon compound particles are prepared by comprising subjecting a mixed raw material powder comprising Si powder and SiO 2 powder to heat treatment at a temperature of lower than 900° C.

3 . The method of claim 1 , wherein the mixing of the silicon compound particles and the Li precursor is performed so that a Li/Si mole ratio is more than 0.3 and 1.0 or less.

4 . The method of claim 1 , wherein the Li precursor is one or more selected from LiOH, Li, LiH, Li 2 O, and Li 2 CO 3 .

5 . The method of claim 1 , wherein the heat treatment for a mixture comprising the silicon compound particles and the Li precursor is performed at higher than 500° C. and lower than 700° C.

Assignees

• Sk On Co Ltd

Inventors

• Park Eunjun
• Kim Joon Sup
• Park Gwi Ok
• Yoon Jeongbae
• Lee Suk Chin
• Kim Hansu
• Youn Donghan
• Chung Dong Jae

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/483 Primary

  for non-aqueous cells (H01M4/485 takes precedence) · CPC title

• C01P2002/74

  by peak-intensities or a ratio thereof only · CPC title

• C01P2002/82

  by IR- or Raman-data · CPC title

• C01P2002/54

  one element only · CPC title