Production of carbon nanotube modified battery electrode powders via single step dispersion

Patent metadata

Field	Value
Publication number	US-11081684-B2
Application number	US-201715604131-A
Country	US
Kind code	B2
Filing date	May 24, 2017
Priority date	May 24, 2017
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

Methods of making single walled carbon nanotubes (SWNTs) including a single step for preparing a homogeneous dispersion of SWNTs in a battery electrode powder. The method may comprise providing a reactor in fluid communication with a mixer, wherein an aerosol containing SWNTs is transmitted from the reactor directly to the mixer containing a battery electrode powder.

First claim

The invention claimed is:

1. A method for preparing a dispersion of single walled carbon nanotubes in a battery electrode powder, the method comprising:
preparing an aerosol containing single walled carbon nanotubes in a reactor; and
transmitting the aerosol directly from the reactor to a mixer containing the battery electrode powder to produce the dispersion,
wherein the battery electrode powder comprises a primary battery electrode powder material and a secondary material, the secondary material being a surfactant optionally together with a binder,
wherein a ratio of single walled carbon nanotubes to battery electrode powder is from about 0.01 to 50 wt %; and
wherein the surfactant comprises sodium dodecyl sulfate, wherein the aerosol is continuously transmitted to the mixer as the single walled carbon nanotubes are prodiced in the reactor.

2. The method according to claim 1 , wherein the primary battery electrode powder material comprises an organic solvent.

3. The method according to claim 2 , wherein the organic solvent comprises n-methylpyrrolidone.

4. The method according to claim 1 , wherein the battery electrode powder is continually mixed as the aerosol is transmitted to the mixer.

5. The method according to claim 4 , wherein the battery electrode powder is continually mixed by a mechanical stirrer, a magnetic stirrer, a ball miller, a sonicator, or a combination thereof provided as part of the mixer.

6. The method according to claim 1 , wherein the single walled carbon nanotubes are produced by contacting a carbon source and a catalyst in the reactor.

7. The method according to claim 6 , wherein the catalyst comprises a metal.

8. The method according to claim 6 , wherein a catalyst precursor is converted to the catalyst in the reactor.

9. The method according to claim 6 , wherein the catalyst comprises nanoparticles.

10. A method for preparing a dispersion of single walled carbon nanotubes in a battery electrode powder, the method comprising:
preparing an aerosol containing single walled carbon nanotubes in a reactor; and
transmitting the aerosol directly from the reactor to a mixer containing the battery electrode powder to produce the dispersion,
wherein the battery electrode powder comprises a primary battery electrode powder material and a secondary material, the secondary material being an anionic surfactant optionally together with a binder, and
wherein a ratio of single walled carbon nanotubes to battery electrode powder is from about 0.01 to 50 wt %, and wherein the aerosol is continuously transmitted to the mixer as the single walled carbon nanotubes are produced in the reactor.

Assignees

• Honda Motor Co Ltd
• Nanosynthesis Plus Ltd

Inventors

• Harutyunyan Avetik
• Pierce Neal
• Pigos Elena Mora

Classifications

• H01M4/623

  fluorinated polymers · CPC title

• H01M4/04 Primary

  Processes of manufacture in general · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/0419 Primary

  involving spraying · CPC title

• C01B2202/02

  Single-walled nanotubes · CPC title