Composite, carbon composite including the composite, electrode, lithium battery, electroluminescent device, biosensor, semiconductor device, and thermoelectric device including the composite and/or the carbon composite

Patent metadata

Field	Value
Publication number	US-10692622-B2
Application number	US-201815928397-A
Country	US
Kind code	B2
Filing date	Mar 22, 2018
Priority date	Sep 30, 2013
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

A composite including: silicon (Si); a silicon oxide of the formula SiOx, wherein 0<x<2; and a graphene disposed on the silicon oxide.

First claim

What is claimed is:

1. A composite comprising:
silicon;
silicon oxide of the formula SiO x on the silicon, wherein 0<x<2; and
graphene directly on the silicon oxide,
wherein the graphene is oriented at an angle of about 0° to about 90°, with respect to a surface of the silicon,
wherein the graphene comprises a plurality of graphene nanosheets or a plurality of graphene layers, and wherein adjacent graphene nanosheets of the plurality of graphene nanosheets or the plurality of graphene layers form an acute angle.

2. The composite of claim 1 , wherein the graphene is oriented parallel to a surface of the silicon.

3. The composite of claim 1 , wherein the graphene is oriented at an angle of about 5° to about 80°, with respect to the surface of the silicon.

4. The composite of claim 3 , wherein the graphene is oriented at an angle of about 10° to about 70°, with respect to the surface of the silicon.

5. The composite of claim 1 , wherein the silicon oxide has a thickness of about 300 μm or less.

6. The composite of claim 1 , wherein the silicon is in the form of a nanowire, a nanoparticle, a nanotube, a nanorod, a wafer, a nanoribbon, or a combination thereof.

7. The composite of claim 1 , wherein the silicon has a cross-sectional diameter of less than about 500 nm.

8. The composite of claim 7 , wherein the silicon has a cross-sectional diameter of about 10 nm to about 300 nm.

9. The composite of claim 1 , wherein the plurality of graphene nanosheets or the plurality of graphene layers, which are non-adjacent at a surface of the silicon oxide, form an acute angle.

10. The composite of claim 1 , wherein the graphene is present in an amount of about 0.001 part to about 10 parts by weight, based on 100 parts by weight of the composite.

11. The composite of claim 1 , wherein a distance between the graphene and the silicon oxide is about 10 nm or less.

12. An electrode comprising the composite of claim 1 .

13. The electrode of claim 12 , wherein the composite further comprises a metal oxide or an aluminum fluoride, and the metal oxide is at least one selected from a magnesium oxide, a manganese oxide, an aluminum oxide, a titanium oxide, a zirconium oxide, a tantalum oxide, a tin oxide, and a hafnium oxide.

14. The electrode of claim 12 , wherein the electrode further comprises at least one second carbon-containing negative electrode active material, and the at least one second carbon-containing negative electrode active material is at least one of natural graphite, artificial graphite, expansion graphite, graphene, carbon black, fullerene soot, carbon nanotube, or carbon fiber.

15. The electrode of claim 12 , wherein the electrode further comprises a conducting agent, and wherein the conducting agent is at least one of acetylene black, ketjen black, natural graphite, artificial graphite, carbon black, carbon fiber, or a metal powder of at least one of copper, nickel, aluminum, or silver.

16. A lithium battery comprising the electrode of claim 12 .

17. A device comprising the composite of claim 1 .

18. The device of claim 17 , wherein the device is an electroluminescent device, a biosensor, a semiconductor device, or a thermoelectric device.

19. A carbon composite comprising the composite of claim 1 and a carbonaceous material.

20. The carbon composite of claim 19 , wherein the carbonaceous material is at least one of graphene, graphite, or carbon nanotube.

21. An electrode comprising the carbon composite of claim 19 .

22. The electrode of claim 21 , wherein the carbon composite further comprises a metal oxide or an aluminum fluoride , and the metal oxide is at least one selected from a magnesium oxide, a manganese oxide, an aluminum oxide, a titanium oxide, a zirconium oxide, a tantalum oxide, a tin oxide, and a hafnium oxide.

23. A method of manufacturing a composite, the method comprising:
contacting a reaction gas to a structure comprising silicon and a silicon oxide of the formula SiOx wherein 0<x<2; and
heat-treating the reaction gas and the structure to form graphene on the silicon and manufacture the composite,
wherein the reaction gas is at least one selected from a compound represented by Formula 1, a compound represented by Formula 2, and an oxygen-containing gas represented by Formula 3:
C n H (2n+2−a) [OH] a   Formula 1

wherein, in Formula 1, n is an integer of 1 to about 20, and a is an integer of 0 or 1,
C n H (2n)   Formula 2

wherein, in Formula 2, n is an integer of 2 to about 6, and
C x H y O z   Formula 3

wherein, in Formula 3, x is an integer of 0 or 1 to about 20, y is 0 or an integer of 1 to about 20, and z is an integer of 1 or 2,
wherein the composite comprises
silicon;
silicon oxide of the formula SiO x on the silicon, wherein 0<x<2; and
graphene directly on the silicon oxide,
wherein the graphene is oriented at an angle of about 0° to about 90°, with respect to a surface of the silicon,
wherein the graphene comprises a plurality of graphene nanosheets or a plurality of graphene layers, and
wherein adjacent graphene nanosheets of the plurality of graphene nanosheets or the plurality of graphene layers form an acute angle.

24. The method of claim 23 , wherein the reaction gas is at least one compound represented by Formula 2 and methane.

25. The method of claim 24 , wherein the reaction gas is methane.

26. The method of claim 23 , wherein the oxygen-containing gas comprises at least one selected from carbon dioxide, carbon monoxide, and water.

27. The method of claim 23 , wherein the heat-treating is performed at a temperature in a range of about 700° C. to about 1100° C.

28. The method of claim 23 , wherein the silicon is in the form of a silicon nanoparticle.

29. The method of claim 28 , wherein the silicon has a cross-sectional diameter of a silicon nanowire may be less than about 500 nm.

30. The method of claim 29 , wherein the silicon has a diameter of about 10 nm to about 300 nm.

31. The method of claim 23 , wherein the graphene is oriented at an angle of about 10° to about 70°, with respect to the surface of the silicon nanoparticle.

32. The method of claim 31 , wherein the graphene is present in an amount of about 0 .001 part to about 10 parts by weight, based on 100 parts by weight of the composite.

33. The method of claim 23 , wherein graphene nanosheets, which are non-adjacent at the surface of the silicon nanoparticle, form an acute angle.

34. A method of manufacturing a negative electrode active material, the method comprising:
contacting a reaction gas to a structure comprising silicon oxide of the formula SiOx wherein 0<x<2; and
heat-treating the reaction gas and the structure to form graphene on the silicon oxide and manufacture the negative electrode active material,
wherein the reaction gas is at least one selected from a compound represented by Formula 1, a compound represented by Formula 2, and an oxygen-containing gas represented by Formula 3:
C n H (2n+2−a) [OH] a   Formula 1

wherein, in Formula 1, n is an integer of 1 to about 20, and a is an integer of 0 or 1,
C n H (2n)   Formula 2

wherein, in Formula 2, n is an integer of 2 to about 6, and
C x H y O z   Formula 3

wherein, in Formula 3,

Assignees

• Samsung Electronics Co Ltd

Inventors

• Son Inhyuk
• Song Hyunjae
• Song Inyong
• Choi Jaeman
• Hwang Seungsik
• Ku Junhwan
• Park Jonghwan
• Chung Yeonji

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• Y10T428/292

  In coating or impregnation · CPC title

• H01B1/04 Primary

  mainly consisting of carbon-silicon compounds, carbon or silicon · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title