Highly crystalline 3D graphene

Patent metadata

Field	Value
Publication number	US-10233087-B2
Application number	US-201514820411-A
Country	US
Kind code	B2
Filing date	Aug 6, 2015
Priority date	Aug 6, 2015
Publication date	Mar 19, 2019
Grant date	Mar 19, 2019

Abstract

Disclosed here is a composition comprising at least one graphene aerogel comprising a three-dimensional structure of graphene sheets, wherein the graphene sheets are covalently interconnected, and wherein the graphene aerogel is highly crystalline. Also described is a method for making a graphene aerogel, comprising preparing a mixture comprising a graphene oxide suspension and at least one catalyst; curing the reaction mixture to produce a wet gel; drying the wet gel to produce a dry gel; and pyrolyzing the dry gel at a temperature of 1500-3500° C. to produce the graphene aerogel.

First claim

What is claimed is:

1. A composition comprising at least one graphene aerogel comprising a three-dimensional structure of graphene sheets, wherein the graphene sheets are covalently interconnected, wherein the graphene aerogel has a Raman spectra in which I D /I G is 0.7 or less, wherein the graphene aerogel has an electrical conductivity of 200-600 S/m and a density of 80 mg/ml or less, and wherein the graphene aerogel is produced by a process comprising thermal annealing at a temperature of 1500-3500° C.

2. The composition of claim 1 , wherein the graphene aerogel has a Raman spectra in which I G′ /I G is 0.5 or more.

3. The composition of claim 1 , wherein the graphene aerogel has an average crystallite size L a of 30 nm or more.

4. The composition of claim 1 , wherein the graphene aerogel has an electrical conductivity of 300-600 S/m.

5. The composition of claim 1 , wherein the graphene aerogel has an oxidation temperature T O of 700° C. or more.

6. The composition of claim 1 , wherein the graphene aerogel has a Young's modulus of 50 MPa or more.

7. The composition of claim 1 , wherein the graphene aerogel has a density of 60 mg/ml or less.

8. The composition of claim 1 , wherein the graphene aerogel has a BET surface area of 300 m 2 /g or more.

9. The composition of claim 1 , wherein the graphene aerogel has a pore volume of at least 1 cm 3 /g.

10. The composition of claim 1 , wherein pores having a diameter of 100 nm or less account for 50% or more of the total pore volume of the graphene aerogel.

11. The composition of claim 1 , wherein pores having a diameter of 100 nm or less account for 50% or more of the total pore number of the graphene aerogel.

12. The composition of claim 1 , wherein 70% or more of the covalent bonds interconnecting the graphene sheets are sp 2 carbon bonds.

13. The composition of claim 1 , wherein the graphene aerogel has an atomic oxygen content of 5% or less.

14. The composition of claim 1 , wherein the graphene aerogel is in the form of a monolith having at least one lateral dimension of 1 mm or more.

15. The composition of claim 1 , wherein the graphene aerogel consists essentially of covalently interconnected graphene sheets.

16. The composition of claim 1 , wherein the composition does not comprise a macroporous foam.

17. A method for making the graphene aerogel of claim 1 , comprising:
preparing a mixture comprising a graphene oxide suspension and at least one catalyst;
curing the mixture to produce a wet gel;
drying the wet gel to produce a dry gel; and
thermally annealing the dry gel at a temperature of 1500-3500° C. to produce the graphene aerogel.

18. The method of claim 17 , wherein the dry gel is thermally annealed at a temperature of 2000-3000° C.

19. The method of claim 17 , wherein the mixture consists essentially of the graphene oxide, the catalyst, and at least one solvent.

20. A device comprising the composition of claim 1 .

Assignees

• L Livermore Nat Security Llc
• Univ California

Inventors

• Worsley Marcus A
• Woo Leta
• Mickelson William
• Zettl Alex

Classifications

• C01P2006/12

  Surface area · CPC title

• C01P2006/10

  Solid density · CPC title

• C01P2006/14

  Pore volume · CPC title

• C01B32/184 Primary

  Preparation · CPC title

• C01B2204/22

  Electronic properties · CPC title