Supercapacitor electrodes including graphenic carbon particles

Patent metadata

Field	Value
Publication number	US-10240052-B2
Application number	US-201514979025-A
Country	US
Kind code	B2
Filing date	Dec 22, 2015
Priority date	Sep 30, 2011
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

Supercapacitor electrodes comprising active charge supporting particles, graphenic carbon particles, and a binder are disclosed. The active charge supporting particles may comprise activated carbon. The graphenic carbon particles may be thermally produced. The electrodes may further comprise electrically conductive carbon.

First claim

We claim:

1. A supercapacitor electrode comprising:
a conductive foil substrate layer; and
electrode coating layers on opposite sides of the conductive foil substrate layer, wherein each electrode coating layer comprises:
from 50 to 95 weight percent active carbon particles;
from 1 to 10 weight percent thermally produced graphenic carbon particles comprising one or more layers of one-atom-thick planar sheets of sp 2 -bonded carbon atoms densely packed in a honeycomb crystal lattice having an aspect ratio of greater than 3:1 and a B.E.T. specific surface area of at least 70 square meters per gram; and
from 1 to 15 weight percent binder.

2. The supercapacitor electrode of claim 1 , wherein the active carbon particles comprise from 60 to 90 weight percent of each of the electrode coating layers.

3. The supercapacitor electrode of claim 1 , wherein the thermally produced graphenic carbon particles comprise from 2 to 5 weight percent of each of the electrode coating layers.

4. The supercapacitor electrode of claim 1 , wherein each of the electrode coating layers further comprises conductive carbon black in an amount of up to 20 weight percent of the electrode coating layer.

5. The supercapacitor electrode of claim 4 , wherein the weight ratio of the thermally produced graphenic carbon particles to the conductive carbon black is 50 percent or less.

6. The supercapacitor electrode of claim 1 , wherein the supercapacitor electrode has a specific capacitance of at least 100 F/g at a current density of 1 A/g.

7. The supercapacitor electrode of claim 1 , wherein the supercapacitor electrode has a specific capacitance of at least 110 F/g at a current density of 1 A/g.

8. The supercapacitor electrode of claim 1 , wherein the supercapacitor electrode has an energy density of at least 2 Wh/kg.

9. A supercapacitor comprising a supercapacitor electrode of claim 1 .

10. The supercapacitor electrode of claim 1 , wherein the graphenic carbon particles comprise one or more layers of one-atom-thick planar sheets of sp 2 -bonded carbon atoms densely packed in a honeycomb crystal lattice having an aspect ratio of greater than 3:1 and a B.E.T. specific surface area of at least 70 square meters per gram.

11. The supercapacitor electrode of claim 10 , wherein the graphenic carbon particles have an oxygen content of 2 atomic percent or less.

12. The supercapacitor electrode of claim 10 , wherein at least a portion of the planar sheets of the graphenic carbon particles are curved, curled, creased or buckled.

13. An electrode coating comprising:
from 50 to 95 weight percent active carbon particles;
from 1 to 10 weight percent thermally produced graphenic carbon particles comprising one or more layers of one-atom-thick planar sheets of sp 2 -bonded carbon atoms densely packed in a honeycomb crystal lattice having an aspect ratio of greater than 3:1 and a B.E.T. specific surface area of at least 70 square meters per gram; and
from 1 to 15 weight percent binder.

14. An electrode coating of claim 13 , wherein the graphenic carbon particles have an oxygen content of 2 atomic percent or less.

15. An electrode coating of claim 13 , wherein at least a portion of the planar sheets of the graphenic carbon particles are curved, curled, creased or buckled.

Assignees

• Ppg Ind Ohio Inc

Inventors

• Asay David B
• Vanier Noel R
• Atmuri Anand K
• Hellring Stuart D
• Hung Cheng-Hung
• Kahle Charles F
• Burgman John W
• Yi Ran

Classifications

• H01G11/48

  Conductive polymers · CPC title

• H01G11/36

  Nanostructures, e.g. nanofibres, nanotubes or fullerenes · CPC title

• Y02E60/13

  Energy storage using capacitors · CPC title

• C09D5/24 Primary

  Electrically-conducting paints {(conductive materials H01B1/00)} · CPC title

• H01G11/34 Primary

  characterised by carbonisation or activation of carbon · CPC title