Carbon fiber composition including graphene nano-powder and fabrication method for carbon fiber using the same

Patent metadata

Field	Value
Publication number	US-10407801-B2
Application number	US-201615346134-A
Country	US
Kind code	B2
Filing date	Nov 8, 2016
Priority date	Jul 13, 2012
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

The present disclosure relates to a carbon fiber composition and a fabrication method for high-performance carbon fiber using the same. The method can fabricate high-performance carbon fiber (or graphite fiber) with lowering a graphitization temperature by using graphene carbon fiber composition including nano-sized graphene.

First claim

What is claimed is:

1. A method for fabricating high-performance carbon fiber, the method comprising steps of:
a mixing step to make a graphene carbon fiber composition by mixing a composition for fabricating carbon fiber, and graphene powder, wherein the composition for fabricating carbon fiber includes one selected from the group consisting of, pitch, rayon and combinations thereof; and
a heat treatment step of the graphene carbon fiber composition, and
wherein the graphene powder serves as a seed of nanoribbon-shaped graphite to be formed during carbon fiber fabricating processes.

2. The method of claim 1 , wherein the graphene powder is fabricated by decomposing crystalline graphite, and has a particle size of 20 nm or less.

3. The method of claim 2 , wherein the crystalline graphite is a graphite structure grown in a helix shape.

4. The method of claim 1 , wherein a content of the graphene powder is more than 0.1 wt % based on 100 wt % of the sum of the composition for fabricating carbon fiber and the graphene powder.

5. The method of claim 1 , the mixing step further comprising a solvent, wherein the solvent is selected from the group consisting of alcohol, acetone, dimethylformamide (DMF), tetrahydrofuran (THF) and combinations thereof.

6. The method of claim 1 , wherein the composition for fabricating carbon fiber further includes polyacrylonitrile (PAN).

7. A method for fabricating high-performance carbon fiber, the method comprising steps of:
a mixing step to fabricate a graphene suspension by mixing a composition for fabricating carbon fiber with graphene powder to form a graphene carbon fiber composition, and dispersing the graphene carbon fiber composition in a solvent, wherein the composition for fabricating carbon fiber includes one selected from the group consisting of, pitch, rayon and combinations thereof;
a fabrication step to fabricate mixed-fiber by controlling a viscosity of the graphene suspension and performing a fiberization process of the graphene suspension;
a stabilization step to stabilize the fibers by heating at 200˜400° C. under atmosphere; and
a heat treatment step of fabricating nano ribbon-shaped graphite by graphitization of the stabilized fibers at a temperature less than 2,500° C.,
wherein the graphene powder included in the graphene carbon fiber composition serves as a seed of graphite to be formed during high-performance carbon fiber fabricating processes.

8. The method of claim 7 , wherein the graphitization of the heat treatment step is performed at a temperature in the range of 1,500° C. and greater to less than 2,500° C.

9. The method of claim 7 , wherein the composition for fabricating carbon fiber further includes polyacrylonitrile (PAN).

Assignees

• Korea Inst Sci & Tech

Inventors

• Lee Jae Kap
• Choi Won Kook

Classifications

• C01B32/205

  Preparation · CPC title

• D01F9/16

  from products of vegetable origin or derivatives thereof, e.g. from cellulose acetate (D01F9/18 takes precedence) · CPC title

• D01F9/145

  from pitch or distillation residues · CPC title

• Y10S977/842

  for carbon nanotubes or fullerenes · CPC title

• C01B32/184

  Preparation · CPC title