Patent
US 10,458,026Method of Producing Graphene
Derek Fray, Ali Kamali
Cambridge Enterprise Limited·20 August 2015·US
Copyright © 2026 Matter42. All rights reserved.
Patent
Atlas literature
Patent
US 10,458,026Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
I. A method of producing graphene sheets comprising the steps o f, (a) forming a carbonaceous powder by electrochemical erosion of a graphite electrode in a molten salt comprising hydrogen ions, b) recovering the resulting carbonaceo u s powder from the molten salt liquid, and (c) thermally treating the carbonaceous powder by heating the carbonaceous powder in a nonoxidising atmosphere to produce a thermally treated powder comprising graphene sheets the graphite electrode, water from the moist gas either dissolving in the molten or reacting with the molten salt to introduce hydrogen ions into the molten salt.
A method according to claim 1 in which the molten salt comprises lithium chloride. Original
A method according to claim 1 in which electrochemical erosion of the graphite electrode is performed under an atmosphere of moist gas, wherein the molten salt is shrouded under a flow of moist gas. Previously presented
A method according to claim 1 in which the molten salt is sparged with the moist gas during electrochemical erosion of the graphite electrode. Previously presented
A method according to claim 1 in which the temperature of the molten salt during the electrochemical erosion of the graphite electrode is greater than 800 °C. Previously presented
A method according to claim 1 in which the molten salt and the carbonaceous powder is recovered from the molten salt by a process comprising steps of cooling and solidifying the molten salt, and washing the solidified salt from the carbonaceous powder. Previously presented
A method according to claim 1 in which the carbonaceous powder comprises a metal hydride compound prior to the step of thermal treatment, for example lithium hydride, the metal species in the metal hydride being derived from the molten salt. Previously presented
A method according to claim 1 in which the carbonaceous powder is thermally treated by heating to a temperature of greater than 1,000 ° C, for example to 1250 °C +/- 50 0 C, in a reducing atmosphere, for example, in a reducing gas atmosphere comprising a mixture of nitrogen and hydrogen. Currently amended
A method according to claim 1 in which the graphene sheets are graphene nanosheets having lateral dimensions of greater than 200 nanometres. Previously presented
A method according to claim 1 in which the current at the graphite electrode during electrochemical erosion of the electrode is greater than 0.5 A/cm 2. Previously presented
A method according to claim 1 in which graphene sheets are produced at a rate of greater than 1 kg per hour, per square metre of graphite electrode immersed in the ionic liquid. Previously presented
A method according to claim 1 in which the graphite electrode is cathodic in polarity during electrochemical erosion. Previously presented
A method according to claim 1 comprising the step of; (a) forming a carbonaceous powder by electrochemical erosion of two or more graphite electrodes in a molten salt comprising hydrogen ions, each of the two or more graphite electrodes alternately serving as a negative electrode in connection with a positive counter electrode for periods of time in order to effect the electrochemical erosion. Previously presented
A powder comprising greater than 80 % by weight of graphene sheets produced by a method defined in claim 1. Previously presented
Canceled
A method according to claim in which the moist gas is a moist inert gas, for example moist argon or moist nitrogen. Currently amended
A method according to any of claim in which the moist gas is produced by flowing a gas over, or through, a water source. Currently amended
Canceled
Canceled
-28. Canceled
Canceled
A method of producing graphene sheets comprising the steps of, (a) forming a carbonaceous powder by electrochemical erosion of a graphite electrode in a molten salt comprising hydrogen ions, (b) recovering the resulting carbonaceous powder from the molten salt liquid, and (c) thermally treating the carbonaceous powder by heating the carbonaceous powder in a nonoxidising atmosphere to produce a thermally treated powder comprising graphene sheets, in which the molten salt is in contact with a dry gas during the electrochemical erosion of the graphite electrode, the dry gas comprising an inert gas comprising argon or nitrogen, and hydrogen. New
A method according to claim 29 in which the molten salt comprises lithium chloride. New
A method according to claim 29 in which the molten salt and the carbonaceous powder is recovered from the molten salt by a process comprising steps of cooling and solidifying the molten salt, and washing the solidified salt from the carbonaceous powder. New
A method according to claim 29 in which the carbonaceous powder comprises a metal hydride compound prior to the step of thermal treatment, for example lithium hydride, the metal species in the metal hydride being derived from the molten salt. New
A method according to claim 29 in which the carbonaceous powder is thermally treated by heating to a temperature of greater than 1,000 ° C, for example to 1250 ° C +/- 50 0 C, in a reducing atmosphere, for example, in a reducing gas atmosphere comprising a mixture of nitrogen and hydrogen. New
A method according to claim 29 in which the graphene sheets are graphene nanosheets having lateral dimensions of greater than 200 nanometres. New
A method according to claim 29 in which the current at the graphite electrode during electrochemical erosion of the electrode is greater than 0.5 A/cm2. New
A method according to claim 29 in which graphene sheets are produced at a rate of greater than 1 kg per hour, per square metre of graphite electrode immersed in the ionic liquid. New
A method according to claim 29 in which the graphite electrode is cathodic in polarity during electrochemical erosion. New
A method according to claim 29 comprising the step of; (a) forming a carbonaceous powder by electrochemical erosion of two or more graphite electrodes in a molten salt comprising hydrogen ions, each of the two or more graphite electrodes alternately serving as a negative electrode in connection with a positive counter electrode for periods of time in order to effect the electrochemical erosion. New
A powder comprising greater than 80 % by weight of graphene sheets produced by the method of claim 29. New
Materials described outside the worked examples.
graphene sheets
graphite electrode
C
Additional fabrication and treatment steps described in the patent.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Temperature | ≥ 800 °C | — |
Temperature |
Related documents with shared materials, methods, properties, or citations.
Patent
Atlas literature
Patent
US 10,458,026Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
I. A method of producing graphene sheets comprising the steps o f, (a) forming a carbonaceous powder by electrochemical erosion of a graphite electrode in a molten salt comprising hydrogen ions, b) recovering the resulting carbonaceo u s powder from the molten salt liquid, and (c) thermally treating the carbonaceous powder by heating the carbonaceous powder in a nonoxidising atmosphere to produce a thermally treated powder comprising graphene sheets the graphite electrode, water from the moist gas either dissolving in the molten or reacting with the molten salt to introduce hydrogen ions into the molten salt.
A method according to claim 1 in which the molten salt comprises lithium chloride. Original
A method according to claim 1 in which electrochemical erosion of the graphite electrode is performed under an atmosphere of moist gas, wherein the molten salt is shrouded under a flow of moist gas. Previously presented
A method according to claim 1 in which the molten salt is sparged with the moist gas during electrochemical erosion of the graphite electrode. Previously presented
A method according to claim 1 in which the temperature of the molten salt during the electrochemical erosion of the graphite electrode is greater than 800 °C. Previously presented
A method according to claim 1 in which the molten salt and the carbonaceous powder is recovered from the molten salt by a process comprising steps of cooling and solidifying the molten salt, and washing the solidified salt from the carbonaceous powder. Previously presented
A method according to claim 1 in which the carbonaceous powder comprises a metal hydride compound prior to the step of thermal treatment, for example lithium hydride, the metal species in the metal hydride being derived from the molten salt. Previously presented
A method according to claim 1 in which the carbonaceous powder is thermally treated by heating to a temperature of greater than 1,000 ° C, for example to 1250 °C +/- 50 0 C, in a reducing atmosphere, for example, in a reducing gas atmosphere comprising a mixture of nitrogen and hydrogen. Currently amended
A method according to claim 1 in which the graphene sheets are graphene nanosheets having lateral dimensions of greater than 200 nanometres. Previously presented
A method according to claim 1 in which the current at the graphite electrode during electrochemical erosion of the electrode is greater than 0.5 A/cm 2. Previously presented
A method according to claim 1 in which graphene sheets are produced at a rate of greater than 1 kg per hour, per square metre of graphite electrode immersed in the ionic liquid. Previously presented
A method according to claim 1 in which the graphite electrode is cathodic in polarity during electrochemical erosion. Previously presented
A method according to claim 1 comprising the step of; (a) forming a carbonaceous powder by electrochemical erosion of two or more graphite electrodes in a molten salt comprising hydrogen ions, each of the two or more graphite electrodes alternately serving as a negative electrode in connection with a positive counter electrode for periods of time in order to effect the electrochemical erosion. Previously presented
A powder comprising greater than 80 % by weight of graphene sheets produced by a method defined in claim 1. Previously presented
Canceled
A method according to claim in which the moist gas is a moist inert gas, for example moist argon or moist nitrogen. Currently amended
A method according to any of claim in which the moist gas is produced by flowing a gas over, or through, a water source. Currently amended
Canceled
Canceled
-28. Canceled
Canceled
A method of producing graphene sheets comprising the steps of, (a) forming a carbonaceous powder by electrochemical erosion of a graphite electrode in a molten salt comprising hydrogen ions, (b) recovering the resulting carbonaceous powder from the molten salt liquid, and (c) thermally treating the carbonaceous powder by heating the carbonaceous powder in a nonoxidising atmosphere to produce a thermally treated powder comprising graphene sheets, in which the molten salt is in contact with a dry gas during the electrochemical erosion of the graphite electrode, the dry gas comprising an inert gas comprising argon or nitrogen, and hydrogen. New
A method according to claim 29 in which the molten salt comprises lithium chloride. New
A method according to claim 29 in which the molten salt and the carbonaceous powder is recovered from the molten salt by a process comprising steps of cooling and solidifying the molten salt, and washing the solidified salt from the carbonaceous powder. New
A method according to claim 29 in which the carbonaceous powder comprises a metal hydride compound prior to the step of thermal treatment, for example lithium hydride, the metal species in the metal hydride being derived from the molten salt. New
A method according to claim 29 in which the carbonaceous powder is thermally treated by heating to a temperature of greater than 1,000 ° C, for example to 1250 ° C +/- 50 0 C, in a reducing atmosphere, for example, in a reducing gas atmosphere comprising a mixture of nitrogen and hydrogen. New
A method according to claim 29 in which the graphene sheets are graphene nanosheets having lateral dimensions of greater than 200 nanometres. New
A method according to claim 29 in which the current at the graphite electrode during electrochemical erosion of the electrode is greater than 0.5 A/cm2. New
A method according to claim 29 in which graphene sheets are produced at a rate of greater than 1 kg per hour, per square metre of graphite electrode immersed in the ionic liquid. New
A method according to claim 29 in which the graphite electrode is cathodic in polarity during electrochemical erosion. New
A method according to claim 29 comprising the step of; (a) forming a carbonaceous powder by electrochemical erosion of two or more graphite electrodes in a molten salt comprising hydrogen ions, each of the two or more graphite electrodes alternately serving as a negative electrode in connection with a positive counter electrode for periods of time in order to effect the electrochemical erosion. New
A powder comprising greater than 80 % by weight of graphene sheets produced by the method of claim 29. New
Materials described outside the worked examples.
graphene sheets
graphite electrode
C
Additional fabrication and treatment steps described in the patent.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Temperature | ≥ 800 °C | — |
Temperature |
Related documents with shared materials, methods, properties, or citations.
Patent
Atlas literature
Patent
US 10,458,026Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
I. A method of producing graphene sheets comprising the steps o f, (a) forming a carbonaceous powder by electrochemical erosion of a graphite electrode in a molten salt comprising hydrogen ions, b) recovering the resulting carbonaceo u s powder from the molten salt liquid, and (c) thermally treating the carbonaceous powder by heating the carbonaceous powder in a nonoxidising atmosphere to produce a thermally treated powder comprising graphene sheets the graphite electrode, water from the moist gas either dissolving in the molten or reacting with the molten salt to introduce hydrogen ions into the molten salt.
A method according to claim 1 in which the molten salt comprises lithium chloride. Original
A method according to claim 1 in which electrochemical erosion of the graphite electrode is performed under an atmosphere of moist gas, wherein the molten salt is shrouded under a flow of moist gas. Previously presented
A method according to claim 1 in which the molten salt is sparged with the moist gas during electrochemical erosion of the graphite electrode. Previously presented
A method according to claim 1 in which the temperature of the molten salt during the electrochemical erosion of the graphite electrode is greater than 800 °C. Previously presented
A method according to claim 1 in which the molten salt and the carbonaceous powder is recovered from the molten salt by a process comprising steps of cooling and solidifying the molten salt, and washing the solidified salt from the carbonaceous powder. Previously presented
A method according to claim 1 in which the carbonaceous powder comprises a metal hydride compound prior to the step of thermal treatment, for example lithium hydride, the metal species in the metal hydride being derived from the molten salt. Previously presented
A method according to claim 1 in which the carbonaceous powder is thermally treated by heating to a temperature of greater than 1,000 ° C, for example to 1250 °C +/- 50 0 C, in a reducing atmosphere, for example, in a reducing gas atmosphere comprising a mixture of nitrogen and hydrogen. Currently amended
A method according to claim 1 in which the graphene sheets are graphene nanosheets having lateral dimensions of greater than 200 nanometres. Previously presented
A method according to claim 1 in which the current at the graphite electrode during electrochemical erosion of the electrode is greater than 0.5 A/cm 2. Previously presented
A method according to claim 1 in which graphene sheets are produced at a rate of greater than 1 kg per hour, per square metre of graphite electrode immersed in the ionic liquid. Previously presented
A method according to claim 1 in which the graphite electrode is cathodic in polarity during electrochemical erosion. Previously presented
A method according to claim 1 comprising the step of; (a) forming a carbonaceous powder by electrochemical erosion of two or more graphite electrodes in a molten salt comprising hydrogen ions, each of the two or more graphite electrodes alternately serving as a negative electrode in connection with a positive counter electrode for periods of time in order to effect the electrochemical erosion. Previously presented
A powder comprising greater than 80 % by weight of graphene sheets produced by a method defined in claim 1. Previously presented
Canceled
A method according to claim in which the moist gas is a moist inert gas, for example moist argon or moist nitrogen. Currently amended
A method according to any of claim in which the moist gas is produced by flowing a gas over, or through, a water source. Currently amended
Canceled
Canceled
-28. Canceled
Canceled
A method of producing graphene sheets comprising the steps of, (a) forming a carbonaceous powder by electrochemical erosion of a graphite electrode in a molten salt comprising hydrogen ions, (b) recovering the resulting carbonaceous powder from the molten salt liquid, and (c) thermally treating the carbonaceous powder by heating the carbonaceous powder in a nonoxidising atmosphere to produce a thermally treated powder comprising graphene sheets, in which the molten salt is in contact with a dry gas during the electrochemical erosion of the graphite electrode, the dry gas comprising an inert gas comprising argon or nitrogen, and hydrogen. New
A method according to claim 29 in which the molten salt comprises lithium chloride. New
A method according to claim 29 in which the molten salt and the carbonaceous powder is recovered from the molten salt by a process comprising steps of cooling and solidifying the molten salt, and washing the solidified salt from the carbonaceous powder. New
A method according to claim 29 in which the carbonaceous powder comprises a metal hydride compound prior to the step of thermal treatment, for example lithium hydride, the metal species in the metal hydride being derived from the molten salt. New
A method according to claim 29 in which the carbonaceous powder is thermally treated by heating to a temperature of greater than 1,000 ° C, for example to 1250 ° C +/- 50 0 C, in a reducing atmosphere, for example, in a reducing gas atmosphere comprising a mixture of nitrogen and hydrogen. New
A method according to claim 29 in which the graphene sheets are graphene nanosheets having lateral dimensions of greater than 200 nanometres. New
A method according to claim 29 in which the current at the graphite electrode during electrochemical erosion of the electrode is greater than 0.5 A/cm2. New
A method according to claim 29 in which graphene sheets are produced at a rate of greater than 1 kg per hour, per square metre of graphite electrode immersed in the ionic liquid. New
A method according to claim 29 in which the graphite electrode is cathodic in polarity during electrochemical erosion. New
A method according to claim 29 comprising the step of; (a) forming a carbonaceous powder by electrochemical erosion of two or more graphite electrodes in a molten salt comprising hydrogen ions, each of the two or more graphite electrodes alternately serving as a negative electrode in connection with a positive counter electrode for periods of time in order to effect the electrochemical erosion. New
A powder comprising greater than 80 % by weight of graphene sheets produced by the method of claim 29. New
Materials described outside the worked examples.
graphene sheets
graphite electrode
C
Additional fabrication and treatment steps described in the patent.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Temperature | ≥ 800 °C | — |
Temperature |
Related documents with shared materials, methods, properties, or citations.
Patent
Atlas literature
Patent
US 10,458,026Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
I. A method of producing graphene sheets comprising the steps o f, (a) forming a carbonaceous powder by electrochemical erosion of a graphite electrode in a molten salt comprising hydrogen ions, b) recovering the resulting carbonaceo u s powder from the molten salt liquid, and (c) thermally treating the carbonaceous powder by heating the carbonaceous powder in a nonoxidising atmosphere to produce a thermally treated powder comprising graphene sheets the graphite electrode, water from the moist gas either dissolving in the molten or reacting with the molten salt to introduce hydrogen ions into the molten salt.
A method according to claim 1 in which the molten salt comprises lithium chloride. Original
A method according to claim 1 in which electrochemical erosion of the graphite electrode is performed under an atmosphere of moist gas, wherein the molten salt is shrouded under a flow of moist gas. Previously presented
A method according to claim 1 in which the molten salt is sparged with the moist gas during electrochemical erosion of the graphite electrode. Previously presented
A method according to claim 1 in which the temperature of the molten salt during the electrochemical erosion of the graphite electrode is greater than 800 °C. Previously presented
A method according to claim 1 in which the molten salt and the carbonaceous powder is recovered from the molten salt by a process comprising steps of cooling and solidifying the molten salt, and washing the solidified salt from the carbonaceous powder. Previously presented
A method according to claim 1 in which the carbonaceous powder comprises a metal hydride compound prior to the step of thermal treatment, for example lithium hydride, the metal species in the metal hydride being derived from the molten salt. Previously presented
A method according to claim 1 in which the carbonaceous powder is thermally treated by heating to a temperature of greater than 1,000 ° C, for example to 1250 °C +/- 50 0 C, in a reducing atmosphere, for example, in a reducing gas atmosphere comprising a mixture of nitrogen and hydrogen. Currently amended
A method according to claim 1 in which the graphene sheets are graphene nanosheets having lateral dimensions of greater than 200 nanometres. Previously presented
A method according to claim 1 in which the current at the graphite electrode during electrochemical erosion of the electrode is greater than 0.5 A/cm 2. Previously presented
A method according to claim 1 in which graphene sheets are produced at a rate of greater than 1 kg per hour, per square metre of graphite electrode immersed in the ionic liquid. Previously presented
A method according to claim 1 in which the graphite electrode is cathodic in polarity during electrochemical erosion. Previously presented
A method according to claim 1 comprising the step of; (a) forming a carbonaceous powder by electrochemical erosion of two or more graphite electrodes in a molten salt comprising hydrogen ions, each of the two or more graphite electrodes alternately serving as a negative electrode in connection with a positive counter electrode for periods of time in order to effect the electrochemical erosion. Previously presented
A powder comprising greater than 80 % by weight of graphene sheets produced by a method defined in claim 1. Previously presented
Canceled
A method according to claim in which the moist gas is a moist inert gas, for example moist argon or moist nitrogen. Currently amended
A method according to any of claim in which the moist gas is produced by flowing a gas over, or through, a water source. Currently amended
Canceled
Canceled
-28. Canceled
Canceled
A method of producing graphene sheets comprising the steps of, (a) forming a carbonaceous powder by electrochemical erosion of a graphite electrode in a molten salt comprising hydrogen ions, (b) recovering the resulting carbonaceous powder from the molten salt liquid, and (c) thermally treating the carbonaceous powder by heating the carbonaceous powder in a nonoxidising atmosphere to produce a thermally treated powder comprising graphene sheets, in which the molten salt is in contact with a dry gas during the electrochemical erosion of the graphite electrode, the dry gas comprising an inert gas comprising argon or nitrogen, and hydrogen. New
A method according to claim 29 in which the molten salt comprises lithium chloride. New
A method according to claim 29 in which the molten salt and the carbonaceous powder is recovered from the molten salt by a process comprising steps of cooling and solidifying the molten salt, and washing the solidified salt from the carbonaceous powder. New
A method according to claim 29 in which the carbonaceous powder comprises a metal hydride compound prior to the step of thermal treatment, for example lithium hydride, the metal species in the metal hydride being derived from the molten salt. New
A method according to claim 29 in which the carbonaceous powder is thermally treated by heating to a temperature of greater than 1,000 ° C, for example to 1250 ° C +/- 50 0 C, in a reducing atmosphere, for example, in a reducing gas atmosphere comprising a mixture of nitrogen and hydrogen. New
A method according to claim 29 in which the graphene sheets are graphene nanosheets having lateral dimensions of greater than 200 nanometres. New
A method according to claim 29 in which the current at the graphite electrode during electrochemical erosion of the electrode is greater than 0.5 A/cm2. New
A method according to claim 29 in which graphene sheets are produced at a rate of greater than 1 kg per hour, per square metre of graphite electrode immersed in the ionic liquid. New
A method according to claim 29 in which the graphite electrode is cathodic in polarity during electrochemical erosion. New
A method according to claim 29 comprising the step of; (a) forming a carbonaceous powder by electrochemical erosion of two or more graphite electrodes in a molten salt comprising hydrogen ions, each of the two or more graphite electrodes alternately serving as a negative electrode in connection with a positive counter electrode for periods of time in order to effect the electrochemical erosion. New
A powder comprising greater than 80 % by weight of graphene sheets produced by the method of claim 29. New
Materials described outside the worked examples.
graphene sheets
graphite electrode
C
Additional fabrication and treatment steps described in the patent.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Temperature | ≥ 800 °C | — |
Temperature |
Related documents with shared materials, methods, properties, or citations.
molten salt comprising hydrogen ions
carbonaceous powder
lithium chloride
LiCl
lithium hydride
LiH
| — |
Thickness | 100–300 nm | — |
Thickness | 1100–2000 cm | — |
Thickness | 2500–2900 cm | — |
Thickness | 1000–2000 cm | — |
Thickness | 1576–1579 cm | — |
Thickness | 1326–1332 cm | — |
Thickness | ≥ 10 µm | — |
Thickness | ≥ 500 nm | — |
molten salt comprising hydrogen ions
carbonaceous powder
lithium chloride
LiCl
lithium hydride
LiH
| — |
Thickness | 100–300 nm | — |
Thickness | 1100–2000 cm | — |
Thickness | 2500–2900 cm | — |
Thickness | 1000–2000 cm | — |
Thickness | 1576–1579 cm | — |
Thickness | 1326–1332 cm | — |
Thickness | ≥ 10 µm | — |
Thickness | ≥ 500 nm | — |
molten salt comprising hydrogen ions
carbonaceous powder
lithium chloride
LiCl
lithium hydride
LiH
| — |
Thickness | 100–300 nm | — |
Thickness | 1100–2000 cm | — |
Thickness | 2500–2900 cm | — |
Thickness | 1000–2000 cm | — |
Thickness | 1576–1579 cm | — |
Thickness | 1326–1332 cm | — |
Thickness | ≥ 10 µm | — |
Thickness | ≥ 500 nm | — |
molten salt comprising hydrogen ions
carbonaceous powder
lithium chloride
LiCl
lithium hydride
LiH
| — |
Thickness | 100–300 nm | — |
Thickness | 1100–2000 cm | — |
Thickness | 2500–2900 cm | — |
Thickness | 1000–2000 cm | — |
Thickness | 1576–1579 cm | — |
Thickness | 1326–1332 cm | — |
Thickness | ≥ 10 µm | — |
Thickness | ≥ 500 nm | — |