Flash carbon coating on active surfaces, methods of manufacture thereof and articles comprising the same

Patent metadata

Field	Value
Publication number	US-11476463-B2
Application number	US-202016987597-A
Country	US
Kind code	B2
Filing date	Aug 7, 2020
Priority date	Aug 7, 2020
Publication date	Oct 18, 2022
Grant date	Oct 18, 2022

Abstract

Disclosed herein is a method comprising mixing an electroactive particle with a carbonaceous material to form a particle mixture that comprises a carbon coated particle; subjecting the carbon coated particle to a pulsed voltage between parallel plate electrodes or between rolls of a roll mill; and converting the carbon coated particle to a graphite coated particle via localized Joule heating. Disclosed herein too is an apparatus comprising a mixing device that is operative to mix an electroactive particle with a carbonaceous material to form a particle mixture that comprises a carbon coated particle; and a device for applying a pulsed voltage to the particle mixture; where the applying of the pulsed voltage is conducted when the particle mixture is located between opposing plate electrodes or between opposing rolls of a roll mill; where the device for applying the pulsed voltage converts the carbon coated particle into a graphite coated particle.

First claim

What is claimed is:

1. A method comprising:
mixing an electroactive particle with a non-conductive carbonaceous material to form a particle mixture that comprises a coated particle comprising the electroactive particle having a coating consisting of the carbonaceous material;
subjecting the coated particle to a pulsed voltage between parallel plate electrodes or between rolls of a roll mill to convert the coated particle to a graphite coated particle via localized Joule heating.

2. The method of claim 1 , where the pulsed voltage is 10 to 200 volts.

3. The method of claim 1 , where the pulsed voltage has a pulse duration of 5 to 50 milliseconds.

4. The method of claim 1 , where the particle mixture further comprises a solvent.

5. The method of claim 1 , where the parallel plate electrodes comprise a refractory material.

6. The method of claim 5 , where the refractive material is copper, graphite or tungsten.

7. The method of claim 1 , where the graphite coated particle comprises an amorphous layer and a graphite layer.

8. The method of claim 7 , where the amorphous layer is disposed between the electroactive particle and the graphite layer.

9. The method of claim 1 , where the graphite coated particle comprises only a graphite layer disposed on the electroactive particle.

10. The method of claim 1 , further comprising transporting the particle mixture while applying the pulsed voltage to the particle mixture.

11. The method of claim 1 , further comprising discharging the particle mixture from a mixing device to the parallel plate electrode.

12. The method of claim 1 wherein the carbonaceous material is selected from the group consisting of polymers, carbon containing gases, aliphatic or aromatic hydrocarbons with or without oxygen atoms, organic polymers or combinations thereof.

13. A method comprising:
mixing an electroactive particle with a carbonaceous material to form a particle mixture that comprises a carbon coated particle;
subjecting the carbon coated particle to a pulsed voltage between parallel plate electrodes or between rolls of a roll mill; and
converting the carbon coated particle to a graphite coated particle via localized Joule heating where the particle mixture is discharged from a mixing device to a moving sheet which is a current collector.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Cain Jeffrey D
• Moylan Thomas E
• Bobel Andrew C
• Wang Lei

Classifications

• C01B32/205

  Preparation · CPC title

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M4/366

  as layered products · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/583 Primary

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title