Graphene fiber and method of manufacturing same

Patent metadata

Field	Value
Publication number	US-10683590-B2
Application number	US-201615744509-A
Country	US
Kind code	B2
Filing date	Jul 18, 2016
Priority date	Jul 16, 2015
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

Embodiments of the invention relate generally to graphene fibers and, more particularly, to graphene fibers comprising intercalated large-sized graphene oxide (LGGO)/graphene sheets and small-sized graphene oxide (SMGO)/graphene sheets having high thermal and electrical conductivities and high mechanical strength. In one embodiment, the invention provides a graphene fiber comprising: a plurality of intercalated graphene sheets including: a plurality of large-sized graphene sheets; and a plurality of small-sized graphene sheets, wherein at least one of the plurality of small-sized graphene sheets is disposed between at least two of the plurality of large-sized graphene sheets.

First claim

What is claimed is:

1. A graphene fiber comprising:
a plurality of intercalated graphene sheets including:
a plurality of large-sized graphene sheets; and
a plurality of small-sized graphene sheets,

wherein at least one of the plurality of small-sized graphene sheets is disposed between at least two of the plurality of large-sized graphene sheets.

2. The graphene fiber of claim 1 , wherein each of the plurality of large-sized graphene sheets is between about 1 μm and about 100 μm in at least one dimension.

3. The graphene fiber of claim 2 , wherein each of the plurality of large-sized graphene sheets is between about 10 μm and about 50 μm in at least one dimension.

4. The graphene fiber of claim 3 , wherein each of the plurality of large-sized graphene sheets is between about 20 μm and about 30 μm in at least one dimension.

5. The graphene fiber of claim 1 , wherein each of the small-sized graphene sheets is between about 20 nm and about 5 μm in at least one dimension.

6. The graphene fiber of claim 5 , wherein each of the small-sized graphene sheets is between about 0.1 μm and about 2 μm in at least one dimension.

7. The graphene fiber of claim 6 , wherein each of the small-sized graphene sheets is between about 0.5 μm and about 1 μm in at least one dimension.

8. The graphene fiber of claim 1 , wherein the plurality of small-sized graphene sheets comprises between about 10 wt % and about 30 wt % of the graphene fiber.

9. The graphene fiber of claim 1 , wherein the graphene fiber has a thermal conductivity between about 500 Wm-1K-1 and about 1340 Wm-1K-1.

10. The graphene fiber of claim 1 , wherein the graphene fiber has an electrical conductivity between about 0.9×105 S/m and about 2.25×105 S/m.

11. The graphene fiber of claim 1 , wherein the graphene fiber has a tensile strength between about 600 MPa and about 1140 MPa.

12. The graphene fiber of claim 1 , wherein the graphene fiber has a Young's modulus between about 40 GPa and about 140 GPa.

13. A method of manufacturing a graphene fiber with aligned structures, the method comprising:
mixing a quantity of a dispersion of large-sized graphene oxide (LGGO) and a quantity of a dispersion of small-sized graphene oxide (SMGO);
spinning the mixed LGGO/SMGO dispersions to form a graphene oxide (GO) fiber; and
annealing the GO fiber at high temperatures for carbonization and graphitization to form a graphene fiber.

14. The method of claim 13 , wherein mixing includes mixing the LGGO dispersion and the SMGO dispersion at proportions of between about 70 wt % and about 90 wt % LGGO dispersion and between about 30 wt % and about 10 wt % SMGO dispersion.

15. The method of claim 13 , wherein mixing includes mixing the LGGO dispersion and the SMGO dispersion at a proportion of about 70 wt % LGGO dispersion and about 30 wt % SMGO dispersion.

16. The method of claim 13 , wherein the LGGO dispersion includes LGGO sheets of between about 1 μm and about 100 μm in at least one dimension.

17. The method of claim 13 , wherein the SMGO dispersion includes SMGO sheets of between about 20 nm and about 5 μm in at least one dimension.

18. The method of claim 13 , wherein spinning includes wet-spinning and dry-spinning.

19. The method of claim 13 , wherein annealing includes annealing the GO fiber at a temperature between about 1400° C. and about 3000° C.

20. The method of claim 13 , wherein any or all of the LGGO dispersion, the SMGO dispersion, or the LGGO/SMGO dispersion includes as a solvent water and/or a compatible organic solvent selected from a group consisting of: N-Methyl-2-pyrrolidone and dimethylformamide.

Assignees

• Rensselaer Polytech Inst

Inventors

• Lian Jie
• Xin Guoqing

Classifications

• C01B32/174

  Derivatisation; Solubilisation; Dispersion in solvents · CPC title

• D01D5/06

  Wet spinning methods {(D01D5/0046 takes precedence)} · CPC title

• C01B2204/24

  Thermal properties · CPC title

• D01F9/12 Primary

  Carbon filaments; Apparatus specially adapted for the manufacture thereof · CPC title

• D01D10/02

  Heat treatment (heating for finishing D02J13/00) · CPC title