Process for preparing a silicon-carbon nanocomposite nanofiber

Patent metadata

Field	Value
Publication number	US-10450674-B2
Application number	US-201715463226-A
Country	US
Kind code	B2
Filing date	Mar 20, 2017
Priority date	Mar 14, 2013
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

Provided herein are nanofibers comprising carbon precursors, nanofibers comprising carbon matrices, and processes for preparing the same. In specific examples, provided herein are high performance lithium ion battery anodic nanofibers comprising non-aggregated silicon domains in a continuous carbon matrix.

First claim

We claim:

1. A process for preparing a nanofiber, the process comprising:
providing a fluid stock comprising (i) a polymer, and (ii) a carbon component, the carbon component being graphene and not carbon nanotubes, the graphene and polymer being present in a graphene-to-polymer weight ratio being at least 1:10;
electrospinning the fluid stock, producing a composite comprising polymer and graphene; and
thermally treating the composite, producing a nanofiber comprising graphene,
wherein the graphene of the fluid stock and/or nanofiber are optionally functionalized.

2. The process of claim 1 , wherein the electrospinning is gas-assisted.

3. The process of claim 2 , wherein the electrospinning is coaxially gas-assisted.

4. The process of claim 1 , wherein the graphene has an aspect ratio of at least 2.

5. The process of claim 1 , wherein the fluid stock further comprises a plurality of silicon nanoparticles.

6. The process of claim 1 , wherein the graphene-to-polymer weight ratio is at least 1:2.

7. The process of claim 6 , wherein the graphene-to-polymer weight ratio is at least 1:1.

8. The process of claim 1 , wherein the graphene is functionalized with one or more carboxyl group, one or more hydroxyl group, one or more alkoxyl group, or a combination thereof.

Assignees

• Univ Cornell

Inventors

• Joo Yong Lak
• Kim Kyoung Woo
• Kim Yong Seok

Classifications

• D04H1/728

  by electro-spinning {(electro-spinning methods and apparatus D01D5/0007)} · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• D01F1/02

  Addition of substances to the spinning solution or to the melt (addition of substances to viscose D01F2/08) · CPC title

• D01D5/0015 Primary

  characterised by the initial state of the material · CPC title

• D01D1/02 Primary

  Preparation of spinning solutions · CPC title