High-voltage devices

• US 10,614,968 B2
• Filed: 01/19/2017
• Issued: 04/07/2020
• Est. Priority Date: 01/22/2016
• Status: Active Grant

• Current Assignee: Regents of the University of California (University of California)
• Original Assignee: Regents of the University of California (University of California)
• Inventors: Kaner, Richard Barry, El-Kady, Maher F.
• Primary Examiner(s): McFadden, Michael P
• Application Number:
  US15/410,404
• Publication Number:
  US 20170213657A1
• Time in Patent Office: 1,174 Days
• Field of Search: 361502
• CPC Class Codes: H01G 11/26 characterised by their structure, e.g. multi-layered, porosity or surface features
• CPC Class Codes: H01G 11/28 arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives
• CPC Class Codes: H01G 11/30 characterised by their material
• CPC Class Codes: H01G 11/60 characterised by the solvent
• CPC Class Codes: H01G 11/68 characterised by their material
• CPC Class Codes: H01G 11/70 characterised by their structure
• CPC Class Codes: H01G 11/86 specially adapted for electrodes carbonisation or activation of carbon for the manufacture of electrodes H01G11/34
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

The present disclosure provides supercapacitors that may avoid the shortcomings of current energy storage technology. Provided herein are supercapacitor devices, and methods of fabrication thereof comprising the manufacture or synthesis of an active material on a current collector and/or the manufacture of supercapacitor electrodes to form planar and stacked arrays of supercapacitor electrodes and devices. Prototype supercapacitors disclosed herein may exhibit improved performance compared to commercial supercapacitors. Additionally, the present disclosure provides a simple, yet versatile technique for the fabrication of supercapacitors through masking and etching.

Claims

1. A supercapacitor device comprising:

an array of electrodes, wherein each electrode comprises

a current collector; and

an active material directly on a portion of a first surface of the current collector,

wherein the active material comprises two or more expanded and interconnected carbon layers, wherein at least one of the carbon layers is corrugated and one atom thick, wherein a portion of the carbon layers is separated by a distance of about 25 nm to about 150 nm.

2. The supercapacitor device of claim 1, further comprising the active material directly on a portion of a second surface of the current collector.

3. The supercapacitor device of claim 1, wherein each electrode in the array of electrodes is separated from a subsequent electrode by a gap.

4. The supercapacitor device of claim 1, wherein the current collector comprises a metal film, a polymeric film, or any combination thereof, wherein the metal film comprises silver, copper, gold, aluminum, calcium, tungsten, zinc, brass, bronze, nickel, lithium, iron, platinum, tin, carbon steel, lead, titanium, stainless steel, mercury, chromium, gallium arsenide, or any combination thereof, and wherein the polymeric film comprises polyfluorene, polyphenylene, polypyrene, polyazulene, polynaphthalene, polyacetylene, poly p-phenylene vinylene, polypyrrole, polycarbazole, polyindole, polyazepinem, polyaniline, polythiophene, poly 3,4-ethylenedioxythiophene, poly p-phenylene sulfide, polyacetylene, or any combination thereof.

5. The supercapacitor device of claim 1, wherein the active material comprises carbon, activated carbon, graphene, polyaniline, polythiophene, an interconnected corrugated carbon-based network (ICCN), or any combination thereof.

6. The supercapacitor device of claim 1, wherein the active material has a specific surface area of from about 250 meters squared per gram to about 3,500 meters squared per gram.

7. The supercapacitor device of claim 1, wherein the active material has a conductivity of from about 750 siemens/meter to about 3,000 siemens/meter.

8. The supercapacitor device of claim 1, wherein the array of electrodes is a two-dimensional planar array of electrodes.

9. The supercapacitor device of claim 8, further comprising an aqueous electrolyte, wherein the number of electrodes is 5, provided that a produced voltage potential across the array of electrodes is from 2.5 V to 10 V.

10. The supercapacitor device of claim 8, further comprising an electrolyte comprising tetraethyl ammonium tetrafluoroborate (TEABF₄) in acetonitrile, wherein the number of electrodes is 5, provided that a voltage potential produced across the array of electrodes is from 6 V to 24 V.

11. The supercapacitor device of claim 8, further comprising an aqueous electrolyte, wherein the number of electrodes is 180, provided that a voltage potential produced across the array of electrodes is from 100 V to 360 V.

12. The supercapacitor device of claim 8, further comprising an electrolyte comprising tetraethyl ammonium tetrafluoroborate (TEABF₄) in acetonitrile, wherein the number of electrodes is 72, provided that a voltage potential produced across the array of electrodes is from 100 V to 360 V.

13. The supercapacitor device of claim 1, wherein the array of electrodes is a stacked array of electrodes.

14. The supercapacitor device of claim 13, further comprising at least one or more of a separator and a support between a pair of adjacent electrodes.

15. The supercapacitor device of claim 13, wherein the stacked array of electrodes comprises one or more single-sided electrodes and one or more double-sided electrodes.

16. The supercapacitor device of claim 1, further comprising an electrolyte, wherein the electrolyte is a liquid, a solid, a gel, or any combination thereof comprising a polymer, silica, fumed silica, fumed silica nano-powder, 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, phosphoric acid, tetraethyl ammonium tetrafluoroborate (TEABF₄), acetonitrile, 1-ethyl-3-methylimidazoliumtetrafluoroborate, ethanolammonium nitrate, a dicarboxylate, a prostaglandin, adenosine monophosphate, guanosine monophosphate, a p-aminohippurate, polysiloxane, polyphosphazene, potassium hydroxide, polyvinyl alcohol or any combination thereof.

17. The supercapacitor device of claim 1, wherein the array of electrodes comprises a linear array of electrodes comprising at least one isobilateral electrode and at least two anisobilateral electrodes.

18. A method of fabricating an array of electrodes comprising:

a) applying an active material directly onto a portion of a first surface of a current collector, wherein the active material comprises two or more expanded and interconnected carbon layers, wherein at least one of the carbon layers is corrugated and one atom thick, wherein a portion of the carbon layers is separated by a distance of about 25 nm to about 150 nm; and

b) drying the active material on the current collector;

provided that each electrode is separated from a subsequent electrode by a gap.

19. The method of claim 18, further comprising:

c) applying the active material directly onto a portion of a second surface of the current collector; and

d) drying the active material on the current collector.

20. The method of claim 19, wherein at least one or more of a tape and a mask shields a portion of the second surface of the current collector to thereby prevent application of the active material onto the shielded portion of the second surface of the current collector.

21. The method of claim 19, wherein the active material is applied in the form of a slurry.

22. The method of claim 21, wherein the slurry is applied to the second surface of the current collector by a doctor blade.

23. The method of claim 19, wherein the applying the active material directly onto the first surface of the current collector and the applying the active material directly onto the second surface of the current collector are performed simultaneously.

24. The method of claim 19, wherein the drying of the active material on the current collector occurs at a temperature of from about 40°

C. to about 160°

C.

25. The method of claim 19, wherein the drying of the active material on the current collector occurs over a period of time of from about 6 hours to about 24 hours.

26. The method of claim 18, wherein the array of electrodes comprises a planar array of electrodes.

27. The method of claim 26, wherein the planar array of electrodes is fabricated by etching or cutting the active material and the current collector.

28. The method of claim 18, wherein the array of electrodes comprises a stacked array of electrodes.

29. The method of claim 28, further comprising positioning at least one or more of a separator and a support, between a pair of consecutive electrodes.

30. The method of claim 19, further comprising:

e) dispersing an electrolyte on the array of electrodes;

f) encasing the array of electrodes in a sheath; and

g) inserting the encased array of electrodes into a housing.

31. The method of claim 30, wherein the electrolyte is a liquid, a solid, a gel, or any combination thereof comprising a polymer, silica, fumed silica, fumed silica nano-powder, 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, phosphoric acid, tetraethyl ammonium tetrafluoroborate (TEABF₄), acetonitrile, 1-ethyl-3-methylimidazoliumtetrafluoroborate, ethanolammonium nitrate, a dicarboxylate, a prostaglandin, adenosine monophosphate, guanosine monophosphate, a p-aminohippurate, polysiloxane, polyphosphazene, potassium hydroxide, polyvinyl alcohol or any combination thereof.