Methods and applications for conductive graphene inks

Patent metadata

Field	Value
Publication number	US-2018305570-A1
Application number	US-201815956356-A
Country	US
Kind code	A1
Filing date	Apr 18, 2018
Priority date	Apr 21, 2017
Publication date	Oct 25, 2018
Grant date	—

Abstract

The present disclosure provides for an exemplary energy storage device and methods of forming thereof, comprising an exemplary conductive graphene ink on exemplary substrates to form durable, flexible, and facile graphene films and energy storage devices for use with and within a variety of electronics and devices.

First claim

What is claimed is:

1 . A conductive graphene ink comprising:
a binder solution comprising a binder and a first solvent; a reduced graphene oxide dispersion comprising reduced graphene oxide, and a second solvent; a third solvent; a conductive additive; a surfactant; and a defoamer.

2 . The conductive graphene ink of claim 1 , wherein at least one of the first solvent, the second solvent, and the third solvent comprises water, ethanol, isopropyl alcohol, N-methyl-2-pyrrolidone, cyclohexanone, terpineol, 3-methoxy-3-methyl-1-butanol, 4-hydroxyl-4-methyl-pentan-2-one, methyl isobutyl ketone, or any combination thereof.

3 . The conductive graphene ink of claim 1 , wherein the binder comprises carboxymethyl cellulose, polyvinylidene fluoride, poly(vinyl alcohol), poly(vinyl pyrrolidone), poly(ethylene oxide), ethyl cellulose, or any combination thereof.

4 . The conductive graphene ink of claim 1 , wherein the conductive additive comprises carbon black, acetylene black, channel black, furnace black, lamp black, thermal black, silver nanoparticles, silver nanorods, silver nanowires, silver nanoflowers, silver nanofibers, silver nanoplatelets, silver nanoribbons, silver nanocubes, silver bipyramids, or any combination thereof.

5 . The conductive graphene ink of claim 1 , wherein the surfactant comprises perfluorooctanoic acid, perfluorooctane sulfonate, perfluorohexane sulfonic acid, perfluorononanoic acid, perfluorodecanoic acid, polyethylene glycol alkyl ether, octaethylene glycol monododecyl ether, a pentaethylene glycol monododecyl ether, polypropylene glycol alkyl ether, glucoside alkyl ether, decyl glucoside, lauryl glucoside, octyl glucoside, polyethylene glycol octylphenyl ether, dodecyldimethylamine oxide, polyethylene glycol alkylphenyl ether, polyethylene glycol octylphenyl ether, Triton X-100, polyethylene glycol alkylphenyl ether, nonoxynol-9, glycerol alkyl ester polysorbate, sorbitan alkyl ester, polyethoxylated tallow amine, Dynol 604, or any combination thereof.

6 . The conductive graphene ink of claim 1 , wherein the defoamer comprises mineral oil, vegetable oil, white oil, polydimethylsiloxane, silicone glycol, a fluorosilicone, polyethylene glycol, ethylene glycol, propylene glycol, glycol stearate, stearin, ethanol, isopropyl alcohol, N-methyl-2-pyrrolidone, cyclohexanone, terpineol, 3-methoxy-3-methyl-1-butanol, 4-hydroxyl-4-methyl-pentan-2-one, methyl isobutyl ketone, Surfynol DF-1100, alkyl polyacrylate, or any combination thereof.

7 . The conductive graphene ink of claim 1 , wherein the conductive graphene ink has a viscosity of at most about 10,000 centipoise.

8 . The conductive graphene ink of claim 1 , wherein the conductive graphene ink has a surface area of at least about 40 m 2 /g.

9 . A method of forming a conductive graphene ink comprising:
forming a binder solution comprising: heating a first solvent; adding a binder to the first solvent; mixing the binder and the first solvent; and cooling the binder and the first solvent; forming a reduced graphene oxide dispersion comprising a second solvent and reduced graphene oxide; forming a graphene solution comprising the binder solution, the reduced graphene oxide dispersion, a third solvent, a conductive additive, a surfactant, and a defoamer; and mixing the graphene solution to form a conductive graphene ink.

10 . The method of claim 9 , wherein at least one of the first solvent, the second solvent, and the third solvent comprises water, ethanol, isopropyl alcohol, N-methyl-2-pyrrolidone, cyclohexanone, terpineol, 3-methoxy-3-methyl-1-butanol, 4-hydroxyl-4-methyl-pentan-2-one, methyl isobutyl ketone, or any combination thereof.

11 . The method of claim 9 , wherein the binder comprises carboxymethyl cellulose, polyvinylidene fluoride, poly(vinyl alcohol), poly(vinyl pyrrolidone), poly(ethylene oxide), ethyl cellulose, or any combination thereof.

12 . The method of claim 9 , wherein the conductive additive comprises carbon black, acetylene black, channel black, furnace black, lamp black, thermal black, silver nanoparticles, silver nanorods, silver nanowires, silver nanoflowers, silver nanofibers, silver nanoplatelets, silver nanoribbons, silver nanocubes, silver bipyramids, or any combination thereof.

13 . The method of claim 9 , wherein the surfactant comprises a polyethylene glycol alkyl ether, polyethylene glycol octylphenyl ether, polyethylene glycol alkylphenyl ether, octaethylene glycol monododecyl ether, pentaethylene glycol monododecyl ether, polypropylene glycol alkyl ether, glucoside alkyl ether, decyl glucoside, lauryl glucoside, octyl glucoside, polyethylene glycol octylphenyl ether, Triton X-100, polyethylene glycol alkylphenyl ether, nonoxynol-9, glycerol alkyl ester polysorbate, sorbitan alkyl ester, polyethylene sorbitan alkyl ester, polyethoxylated tallow amine, Dynol 604, or any combination thereof.

14 . The method of claim 9 , wherein the defoamer comprises mineral oil, vegetable oil, white oil, polydimethylsiloxane, silicone glycol, a fluorosilicone, polyethylene glycol, ethylene glycol, propylene glycol, glycol stearate, stearin, ethanol, isopropyl alcohol, N-methyl-2-pyrrolidone, cyclohexanone, terpineol, 3-methoxy-3-methyl-1-butanol, 4-hydroxyl-4-methyl-pentan-2-one, methyl isobutyl ketone, Surfynol DF-1100, alkyl polyacrylate, or any combination thereof.

15 . The method of claim 9 , wherein the first solvent is heated to a temperature of about 35° C. to about 125° C.

16 . The method of claim 9 , wherein the binder is added to the first solvent during the mixing of the binder and the first solvent, over a period of time of about 45 minutes to about 240 minutes.

17 . The method of claim 9 , wherein, after the binder is fully added to the first solvent, the binder and the first solvent are mixed for a period of time of about 7 minutes to about 30 minutes.

18 . The method of claim 9 , wherein the mixing of the graphene solution is performed with at least one of a stirring speed of about 15 rpm to about 125 rpm, and a dispersing speed of about 50 rpm to about 4,500 rpm.

19 . The method of claim 9 , wherein the graphene solution is mixed under a vacuum degree of about −0.05 MPa to about −0.2 MPa.

20 . The method of claim 9 , wherein the graphene solution is mixed during one or more intervals, wherein each interval comprises a period of time of about 0.5 minutes to about 30 minutes.

21 . The method of claim 9 , wherein the binder and the first solvent are cooled to a temperature of about 10° C. to about 40° C.

Assignees

• Univ California
• Nanotech Energy Inc

Inventors

• El-Kady Maher F
• Mohamed Nahla
• Kavanaugh Jack
• Kaner Richard B

Classifications

• C09D11/106

  containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• H05K2201/026

  Nanotubes or nanowires · CPC title

• H05K1/095

  for polymer thick films, i.e. having a permanent organic polymeric binder · CPC title

• C09D11/38

  characterised by non-macromolecular additives other than solvents, pigments or dyes · CPC title

• H05K2201/0323

  Carbon · CPC title