Negative electrode for lithium secondary battery and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-12142757-B2
Application number	US-202318522233-A
Country	US
Kind code	B2
Filing date	Nov 29, 2023
Priority date	Jun 23, 2022
Publication date	Nov 12, 2024
Grant date	Nov 12, 2024

Abstract

Provided are a negative electrode for a lithium secondary battery and a method of manufacturing the same. The negative electrode for a lithium secondary battery according to an embodiment of the present invention includes a negative electrode active material including: a silicon oxide, lithium, and sodium or potassium, wherein in ICP analysis of a negative electrode active material layer including the negative electrode active material, contents of elements in the negative electrode active material layer satisfy the following Relations (1) and (2):

300≤10 6 *A /( B 2 +C 2 )≤12.0*10 6   (1)

800≤ A ≤140,000  (2)
wherein A is a Li content in ppm, B is a Na content in ppm, and C is a K content in ppm, based on the total weight of the ICP-analyzed negative electrode active material layer.

First claim

What is claimed is:

1. A material comprising:
a silicon oxide;
lithium; and
sodium or potassium,
wherein
300≤10 6 *A /( B 2 +C 2 )≤12.0*10 6 , and  (1)

800≤ A≤ 140,000,  (2)

where A is a Li content in ppm, B is a Na content in ppm, and C is a K content in ppm, based on the total weight of the material.

2. The material of claim 1 , wherein
50≤ B≤ 20,000, and  (3)

15≤ C≤ 10,000.  (4)

3. The material of claim 1 , wherein
200≤ B≤ 20,000, or  (3)

30≤ C≤ 10,000.  (4)

4. The material of claim 1 , wherein
25≤ B+C.   (3)

5. The material of claim 1 , further comprising lithium silicate represented by the following Chemical Formula 1:
Li x Si y O z   [Chemical Formula 1]

wherein 1≤x≤6, 1≤y≤4, and 0<z≤7.

6. The material of claim 1 , further comprising an artificial graphite.

7. The material of claim 1 , further comprising single-walled carbon nanotubes.

8. The material of claim 1 , further comprising one or more of Si, a Si-containing alloy, and a Si/C composite.

9. The material of claim 8 , wherein the Si-containing alloy comprises a S-Q alloy, wherein Q is an element selected from the group consisting of alkali metals, alkaline earth metals, group 13 elements, group 14 elements other than Si, group 15 elements, group 16 elements, transition metals, rare earth elements, and combinations thereof.

10. The material of claim 9 , wherein Q is an element selected from the group consisting of Li, Mg, Na, K, Ca, Sr, Ba, Ra, Sc, Y, Ti, Zr, Hf, Rf, V, Nb, Ta, Db, Cr, Mo, W, Sg, Tc, Re, Bh, Fe, Pb, Ru, Os, Hs, Rh, Ir, Pd, Pt, Cu, Ag, Au, Zn, Cd, B, Al, Ga, Sn, In, Ge, P, As, Sb, Bi, S, Se, Te, Po, and combinations thereof.

11. A lithium secondary battery comprising
a current collector; and
a negative electrode active material layer on the current collector,
wherein the negative electrode active material layer comprises the material of claim 1 and a binder.

12. The lithium secondary battery of claim 11 , wherein
50≤ B≤ 20,000, and  (3)

15≤ C≤ 10,000.  (4)

13. The lithium secondary battery of claim 11 , wherein
200≤ B≤ 20,000, or  (3)

30≤ C≤ 10,000.  (4)

14. The lithium secondary battery of claim 11 , wherein
25≤ B+C.   (3)

15. The lithium secondary battery of claim 11 , wherein the material further comprising lithium silicate represented by the following Chemical Formula 1:
Li x Si y O z   [Chemical Formula 1]

wherein 1≤x≤6, 1≤y≤4, and 0≤z≤7.

16. The lithium secondary battery of claim 11 , wherein the material further comprising an artificial graphite.

17. The lithium secondary battery of claim 11 , wherein the material further comprising single-walled carbon nanotubes.

18. The lithium secondary battery of claim 11 , wherein the material further comprising one or more of Si, a Si-containing alloy, and a Si/C composite.

19. The lithium secondary battery of claim 18 , wherein the Si-containing alloy comprises a S-Q alloy, wherein Q is an element selected from the group consisting of alkali metals, alkaline earth metals, group 13 elements, group 14 elements other than Si, group 15 elements, group 16 elements, transition metals, rare earth elements, and combinations thereof.

20. The lithium secondary battery of claim 11 , wherein Q is an element selected from the group consisting of Li, Mg, Na, K, Ca, Sr, Ba, Ra, Sc, Y, Ti, Zr, Hf, Rf, V, Nb, Ta, Db, Cr, Mo, W, Sg, Tc, Re, Bh, Fe, Pb, Ru, Os, Hs, Rh, Ir, Pd, Pt, Cu, Ag, Au, Zn, Cd, B, Al, Ga, Sn, In, Ge, P, As, Sb, Bi, S, Se, Te, Po, and combinations thereof.

Assignees

• Sk On Co Ltd

Inventors

• Park Eun Jun
• Park Gwi Ok
• Kil Hyo Shik
• Lee In Ae

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/364

  as mixtures · CPC title

• H01M4/483

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