GRAPHENE-SULFUR COMPOSITIONS AND ELECTRODES MADE THEREFROM

John S. Lettow

Patent

Atlas literature

Patent

US 9,922,744

GRAPHENE-SULFUR COMPOSITIONS AND ELECTRODES MADE THEREFROM

John S. Lettow

Claims

Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.

3 independent · 20 dependent

1
Independentgraphite oxidegraphene sheetsSbinderfree-standing, self-supporting electrode material
A method of making an electrode composition, comprising: oxidizing graphite to graphite oxide using at least one sulfur-containing reagent; exfoliating the graphite oxide to form graphene sheets; blending the graphene sheets, a solvent, a binder, and sulfur to form a suspension; applying the suspension to a substrate, removing a quantity of the solvent from the suspension; removing the suspension from the substrate; heating the suspension to decompose the binder thereby forming a free-standing, self- supporting material; and wherein the graphene sheets completely comprise fully exfoliated single sheets of graphene; are approximately 1 nm thick; display no signature corresponding to graphite or graphite oxide in their X-ray diﬀraction pattern; and comprise at least about 1 weight percent sulfur. Currently amended
1. 2
  Dependent← claim 1graphite oxidegraphene sheets
  The method of claim 1, wherein the step of exfoliating the graphite oxide comprises thermally exfoliating the graphite oxide to form the graphene sheets. Previously presented
2. 3
  Dependent← claim 1graphene sheets
  The method of claim 1, wherein the graphene sheets comprise. Previously presented
3. 4
  Dependent← claim 1graphene sheets
  The method of claim 1, further comprising cross-linking the graphene sheets. Currently amended
4. 5
  Dependent← claim 1H₂SO₄
  The method of claim 1, wherein the sulfur-containing reagent is sulfuric acid. Previously presented
5. 6
  Dependent← claim 1H₂SO₄permanganate salt
  The method of claim 1, wherein the graphite is oxidized to graphite oxide using a mixture comprising sulfuric acid and at least permanganate salt. Previously presented
6. 7
  Dependent← claim 1graphene sheets
  The method of claim 1, wherein the graphene sheets have a surface area of at least about 100 m 2/g. Previously presented
7. 8
  Dependent← claim 1binder
  The method of claim 1, wherein the step of heating the suspension to decompose the binder results in no more than 60% of the binder by mass remaining after the decomposition. Previously presented
8. 9
  Dependent← claim 1free-standing, self-supporting electrode material
  The method of claim 1, wherein the free-standing, self-supporting material is formed in a manner to comprise a radius of curvature of less than 1 cm when bent. Previously presented
9. 10
  Dependent← claim 1SNa₂S₂O₃HCl
  The method of claim 1, wherein the sulfur comprises elemental sulfur formed by reacting sodium thiosulfate with hydrochloric. Currently amended
10. 12
  Dependent← claim 1graphene sheets
  The method of claim 1, wherein the graphene sheets have a carbon to oxygen molar ratio of at least about 50:1. Previously presented
11. 21
  Dependent← claim 1S
  The method of claim 1, wherein the sulfur least one functional group that reacts with the
13
Independentgraphite oxidegraphene sheetsSorganosulfur compoundelectrode
An electrode, comprising a composition made by (1) oxidizing graphite to graphite oxide using at least one sulfur-containing reagent, (2) exfoliating the graphite oxide to form graphene sheets, and (3) blending the graphene sheets with elemental sulfur and/or at least one organosulfur compound, wherein the graphene sheets comprise at least about 1 weight percent sulfur. Canceled
1. 14
  Dependent← claim 13cathode
  The electrode of claim 13, in the form of a cathode. Canceled
2. 15
  Dependent← claim 13graphene sheets
  The electrode of claim 13, wherein the graphene sheets comprise at least about 1 weight percent sulfur. Canceled
3. 16
  Dependent← claim 13H₂SO₄
  The electrode of claim 13, wherein the sulfur-containing reagent is sulfuric acid. Canceled
4. 17
  Dependent← claim 13H₂SO₄permanganate salt
  The electrode of claim 13, wherein the graphite is oxidized to graphite oxide using a mixture comprising sulfuric acid and at least permanganate salt. Canceled
5. 18
  Dependent← claim 13graphene sheets
  The electrode of claim 13, wherein the graphene sheets have a surface area of at least about 100 m2/g. Canceled
6. 22
  Dependent← claim 13organosulfur compound
  The method of claim 13, wherein the organosulfur mercaptocarboxylic acid, a trialkoxysilyldisulﬁde, a carboxylic acid disulﬁde, an amino acid disulﬁde, o -thiocarboxylic acid. Canceled
7. 23
  Dependent← claim 13organosulfur compound
  The method of claim 13, wherein the organosulfur aminophenyl) disulﬁde, cysteine, homocystine, mercaptopropionic acid. Canceled comprises organosulfur conﬁgured to comprise at graphene sheets. Previously presented comprises at least one of an Q-a trialkoxysilyltetrasulﬁde, an amino disulﬁde, an alkylol disulﬁdes, a w-thio alcohols, and a comprises at least one of cystamine, bis-(4-2,2'-dithioethanol, 4-mercapto- 1-butanol, and 3-
19
Independentgraphite oxidegraphene sheetsSorganosulfur compoundbattery or ultracapacitor
A battery or ultracapacitor, comprising an electrode comprising a composition made by (1) oxidizing graphite to graphite oxide using at least one sulfur-containing reagent, (2) exfoliating the graphite oxide to form graphene sheets, and (3) blending the graphene sheets with elemental sulfur and/or at least one organosulfur compound, wherein the graphene sheets comprise at least about 1 weight percent sulfur. Canceled
1. 20
  Dependent← claim 19graphene sheets
  The battery of claim 19, wherein the graphene sheets have a surface area of at least about 100 m 2/g. Canceled

Device structures

Layer stacks claimed or described, ordered top of device to substrate.

free-standing, self-supporting electrode material

Sactive electrode

graphene sheetsactive electrode

electrode

organosulfur compoundactive electrode

Sactive electrode

graphene sheetsactive electrode

cathode

Materials

Materials described outside the worked examples.

graphite oxide

Precursor

graphene sheets

Active Electrode Material

Process steps

Additional fabrication and treatment steps described in the patent.

Chemical Oxidation

Step 1

Process details

description:Oxidizing graphite to graphite oxide using at least one sulfur-containing reagent; preferred reagents include H₂SO₄ and permanganate salts

Materials:CH₂SO₄

Reported properties

Performance values and ranges asserted in the specification or claims.

Property	Value	Material
Surface Area	100–2630 m2/g	graphene sheets
Sulfur Content Wt Percent	≥ 1 wt%

Why these are connected

Related documents with shared materials, methods, properties, or citations.

GRAPHENE-SULFUR COMPOSITIONS AND ELECTRODES MADE THEREFROM | Matter42 Literature