Capacitor with electrodes made of an interconnected corrugated carbon-based network

Patent metadata

Field	Value
Publication number	US-11257632-B2
Application number	US-201816029930-A
Country	US
Kind code	B2
Filing date	Jul 9, 2018
Priority date	Mar 5, 2012
Publication date	Feb 22, 2022
Grant date	Feb 22, 2022

Abstract

Capacitors having electrodes made of interconnected corrugated carbon-based networks (ICCNs) are disclosed. The ICCN electrodes have properties that include high surface area and high electrical conductivity. Moreover, the electrodes are fabricated into an interdigital planar geometry with dimensions that range down to a sub-micron scale. As such, micro-supercapacitors employing ICCN electrodes are fabricated on flexible substrates for realizing flexible electronics and on-chip applications that can be integrated with micro-electromechanical systems (MEMS) technology and complementary metal oxide semiconductor technology in a single chip. In addition, capacitors fabricated of ICCN electrodes that sandwich an ion porous separator realize relatively thin and flexible supercapacitors that provide compact and lightweight yet high density energy storage for scalable applications.

First claim

What is claimed is:

1. An energy storage device comprising: a substrate; a first electrode and a second electrode disposed on a first surface of the substrate, wherein at least one of the first electrode or the second electrode is made of a patterned interconnected corrugated carbon-based network (ICCN) comprising a plurality of expanded and interconnected corrugated carbon sheets that form a network of pores, wherein the network of pores has a surface area of greater than about 1000 m 2 /g; a non-conductive liner covering at least a portion of the first electrode and at least a portion of the second electrode, the liner having a central window; and an electrolyte placed within the central window and contacting the first electrode and the second electrode.

2. The energy storage device of claim 1 , wherein the first electrode and the second electrode are interdigitated.

3. The energy storage device of claim 2 , wherein the interdigitated first electrode and second electrode comprise digits having a width of at least about 330 μm.

4. The energy storage device of claim 2 , wherein an interspace distance between the first electrode and the second electrode is less than about 150 μm.

5. The energy storage device of claim 1 , wherein both the first electrode and the second electrode are made of the patterned ICCN.

6. The energy storage device of claim 1 , wherein the first electrode or the second electrode is made of a metal.

7. The energy storage device of claim 1 , having a power density of greater than about 150 W/cm 3 .

8. The energy storage device of claim 1 , having a time constant of less than about 20 ms.

9. The energy storage device of claim 1 , wherein the electrolyte is disposed between the first electrode and the second electrode.

10. The energy storage device of claim 9 , wherein the electrolyte provides a voltage window between a maximum charged voltage and a minimum discharged voltage of about 2.5 V.

11. The energy storage device of claim 9 , wherein the electrolyte is an ionogel.

12. The energy storage device of claim 9 , wherein the electrolyte comprises fumed silica (FS) nano-powder and an ionic liquid.

13. The energy storage device of claim 12 , wherein the ionic liquid comprises 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide.

14. The energy storage device of claim 9 , wherein the electrolyte is a hydrogel.

15. The energy storage device of claim 14 , wherein the hydrogel comprises poly(vinyl alcohol) (PVA)-H 2 SO 4 or poly(vinyl alcohol) (PVA)-H 3 PO 4 .

16. The energy storage device of claim 1 , wherein the plurality of expanded and interconnected corrugated carbon sheets has an electrical conductivity that is greater than about 1500 S/m.

17. The energy storage device of claim 1 , wherein the plurality of expanded and interconnected corrugated carbon sheets yields an electrical conductivity that is greater than about 1500 S/m and a surface area that is greater than about 1000 m 2 /g.

18. The energy storage device of claim 1 , wherein the plurality of expanded and interconnected corrugated carbon sheets has a thickness of about 7 μm to about 8 μm.

19. The energy storage device of claim 1 , wherein the plurality of expanded and interconnected corrugated carbon sheets has a sheet resistance that is tunable within a range of about 20 megaohms per square to about 80 ohms per square.

20. The energy storage device of claim 1 , wherein a number of carbon sheets in the plurality of expanded and interconnected corrugated carbon sheets is greater than about 100.

21. The energy storage device of claim 1 , wherein the energy storage device comprises a capacitor, a battery, a supercapacitor, an electrochemical capacitor, or an electrochemical double layer capacitor.

22. The energy storage device of claim 1 , wherein the electrolyte is a gel electrolyte.

Assignees

• Univ California

Inventors

• El-Kady Maher F
• Strong Veronica A
• Kaner Richard B

Classifications

• Y02E60/13

  Energy storage using capacitors · CPC title

• H01G11/26

  characterised by their structure, e.g. multi-layered, porosity or surface features · CPC title

• H01G11/56

  Solid electrolytes, e.g. gels; Additives therein · CPC title

• H01G11/24

  characterised by structural features of the materials making up or comprised in the electrodes, e.g. form, surface area or porosity; characterised by the structural features of powders or particles used therefor · CPC title

• H01G11/36

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