Patent
US 9,564,630Anode Active Material-Coated Graphene Sheets for Lithium Batteries and Process for Producing Same
Yanbo Wang, Hui He, Aruna Zhamu, Bor Z. Jang
US
Copyright © 2026 Matter42. All rights reserved.
Patent
Atlas literature
Patent
US 9,564,630Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1 Schematic of a prior art anode active material (e.g., Si particles) that tends to undergo 25 pulverization during battery cha r ge-discha r ge cycling.
FIG.2 Schematic of a process for producing anode active material-coated graphene sheets (e.g. Si-, Sn-, and Sn02- coated graphene, graphene oxide, graphene …
FIG.3 SEM image of a graphene-enhanced anode particulate (secondary particle) according to a preferred embodiment of the present invention. 9
FIG. 4 The Si coating volume fraction of Si-coated graphene sheets plotted as a function of the Si coating thickness for various graphene platelet thickness …
FIG. 5 (A) schematic of a prior art lithium-ion battery cell composed of an anode current collector, an anode electrode (e.g. thin Si coating layer), a porous …
FIG.6 (A) a prior art anode containing a thin film Si coated on a sheet of Cu foil current collector; (B) an example of a Si-coated graphene sheet of the …
FIG.7 Cycling behaviors of three lithium-ion batteries having a graphene-supported Si coating, 10 a graphene/Si nano particle mixture, and a carbon nano fiber …
FIG.8 Cycling behaviors of a lithium-ion battery having a graphene- supported Sn coating anode of the present invention and those of a battery containing a …
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A process for producing an anode active material-coated graphene sheet for a lithium battery, said process comprising: (a) providing a continuous film of a graphene material into a deposition zone; (b) introducing vapor or atoms of a precursor anode active material into said deposition zone and depositing said vapor or atoms onto a surface of said graphene material to form a coated continuous film of an anode active material-coated graphene material; (c) mechanically breaking said coated continuous film into multiple pieces of anode active material-coated graphene sheets, wherein said graphene sheet has two opposed parallel surfaces and at least 50 % area of one of said surfaces is coated with an anode active material; and (d) shaping said multiple pieces of anode active material-coated graphene sheets into a secondary particle having a size less than pm; wherein said graphene material is in an amount of from 0.1 % to 99.5 % by weight and said anode active material is in an amount of at least 0.5 % by weight, all based on the total weight of said graphene material and said anode active material combined.
The process of claim 1, wherein said graphene material is selected from pristine graphene, graphene oxide, reduced graphene oxide, graphene fluoride, graphene bromide, graphene iodide, boron-doped graphene, nitrogen-doped graphene, chemically functionalized graphene, or a combination thereof, and said graphene material comprises single-layer or less than 10 graphene planes.
The process of claim 1, wherein said anode active material comprises Sn or Si as a primary element with Si or Sn content no less than 20 % by weight based on the total weight of the anode active material. 2
The process of claim 1, wherein said anode active material comprises an element selected from Si, Ge, Sn, Cd, Sb, Pb, Bi, Zn, Al, Co, Ni, or Ti.
The process of claim 1, wherein said anode active material is selected from the group consisting of: (A) silicon (Si), germanium (Ge), tin (Sn), lead (Pb), antimony (Sb), bismuth (Bi), zin c (Zn), aluminum (Al), titanium (Ti), nickel (Ni), cobalt (Co), and cadmium (Cd); (B) alloys or intermetallic compounds of Si, Ge, Sn, Pb, Sb, Bi, Zn, Al, Ti, Ni, Co, or Cd with other elements, wherein said alloys or compounds are stoichiometric or non- stoichiometric; (C) oxides, carbides, nitrides, sulfides, phosphides, selenides, and tellurides of Si, Ge, Sn, Pb, Sb, Bi, Zn, Al, Ti, Fe, Ni, Co, or Cd, and their mixtures, composites, or lithium- containing composites; (D) salts and hydroxides of Sn; (E) lithium titanate, lithium manganate, lithium aluminate, lithium-containing titanium oxide, lithium transition metal oxide; and (F) combinations thereof.
The process of claim 1, wherein said continuous film of a graphene material is produced by spraying a graphene suspension onto a solid substrate, wherein said graphene suspension contains a graphene material dispersed in a liquid medium, and by removing said liquid medium.
The process of claim 1, wherein said continuous film of a graphene material is produced by chemical vapor deposition of a graphene material onto a solid substrate.
The process of claim 1, wherein said coated film of an anode active material- coated graphene material has an anode active material coating thickness less than 500 nm.
The process of claim 1, wherein said coated film of an anode active material- coated graphene material has an anode active material coating thickness less than 100 nm.
The process of claim 1, wherein said coated film of an anode active material- coated graphene material has an anode active material coating thickness less than 20 nm. 3
The process of claim 1, wherein said step (b) of forming an anode active material- coated graphene material entails chemical vapor deposition, physical vapor deposition, sputtering, or laser-assisted thin-film deposition of an anode active material onto a film of a graphene material.
The process of claim 1, wherein said step (c) of mechanical breaking entails air jet milling, impact milling, grinding, mechanical shearing, ultrasonication, or a combination thereof.
The process of claim 1, further comprising step of shaping said multiple pieces of anode active material-coated graphene sheets into a secondary particle having a size less than 5 pm.
The process of claim 1, wherein said step (b) further comprises depositing a layer of carbon or graphite material onto a surface of said film of an anode active material-coated graphene material.
The process of claim 1, wherein said step of shaping said multiple pieces of anode active material-coated graphene sheets into a secondary particle comprises dispersing said multiple pieces of anode active material-coated graphene sheets in a liquid medium to form a multicomponent suspension and drying said multi-component suspension to form said secondary particle using a spray-drying, spray-pyrolysis, fluidized-bed drying, atomization, or aerosolizing step.
The process of claim 1, wherein said step (a) of providing a continuous film of a graphene material includes feeding said continuous film from a feeder roller into said deposition zone and said step (b) further includes collecting said coated film onto a winding roller.
The process of claim 1, further comprising a step of separating or removing said graphene sheet from said anode active materials and a step of collecting said anode active material.
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A process for producing an anode active material-coated graphene sheet for a lithium battery, said process comprising: (A) providing a continuous film of a graphene material into a deposition zone; (B) introducing vapor or atoms of a precursor anode active material into said deposition zone and depositing said vapor or atoms onto a surface of said graphene material to form a coated continuous film of an anode active material-coated graphene material; (C) mechanically breaking said coated continuous film 4 into multiple pieces of anode active material-coated graphene sheets, wherein said graphene sheet has two opposed parallel surfaces and at least 50 % area of one of said surfaces is coated with an anode active material; and (D) mixing said multiple pieces of anode active material-coated graphene sheets and a resin binder and/or a conductive filler to form an anode layer; wherein said graphene material is in an amount of from 0.1 % to 99.5 % by weight and said anode active material is in an amount of at least 0.5 % by weight, all based on the total weight of said graphene material and said anode active material combined.
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Layer stacks claimed or described, ordered top of device to substrate.
anode layer for lithium battery
Materials described outside the worked examples.
graphene material
pristine graphene
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG.3 SEM image of a graphene-enhanced anode particulate (secondary particle) according to a preferred embodiment of the present invention. 9
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Duration | 15–60 seconds | — |
Thickness |
Related documents with shared materials, methods, properties, or citations.
POLYMER FUNCTIONALIZED GRAPHENE OXIDE AND THERMALLY RESPONSIVE ION PERMEABLE MEMBRANES MADE THEREFROM
Supercapacitor electrode having highly oriented and closely packed graphene sheets and production process
Patent
Atlas literature
Patent
US 9,564,630Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1 Schematic of a prior art anode active material (e.g., Si particles) that tends to undergo 25 pulverization during battery cha r ge-discha r ge cycling.
FIG.2 Schematic of a process for producing anode active material-coated graphene sheets (e.g. Si-, Sn-, and Sn02- coated graphene, graphene oxide, graphene …
FIG.3 SEM image of a graphene-enhanced anode particulate (secondary particle) according to a preferred embodiment of the present invention. 9
FIG. 4 The Si coating volume fraction of Si-coated graphene sheets plotted as a function of the Si coating thickness for various graphene platelet thickness …
FIG. 5 (A) schematic of a prior art lithium-ion battery cell composed of an anode current collector, an anode electrode (e.g. thin Si coating layer), a porous …
FIG.6 (A) a prior art anode containing a thin film Si coated on a sheet of Cu foil current collector; (B) an example of a Si-coated graphene sheet of the …
FIG.7 Cycling behaviors of three lithium-ion batteries having a graphene-supported Si coating, 10 a graphene/Si nano particle mixture, and a carbon nano fiber …
FIG.8 Cycling behaviors of a lithium-ion battery having a graphene- supported Sn coating anode of the present invention and those of a battery containing a …
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A process for producing an anode active material-coated graphene sheet for a lithium battery, said process comprising: (a) providing a continuous film of a graphene material into a deposition zone; (b) introducing vapor or atoms of a precursor anode active material into said deposition zone and depositing said vapor or atoms onto a surface of said graphene material to form a coated continuous film of an anode active material-coated graphene material; (c) mechanically breaking said coated continuous film into multiple pieces of anode active material-coated graphene sheets, wherein said graphene sheet has two opposed parallel surfaces and at least 50 % area of one of said surfaces is coated with an anode active material; and (d) shaping said multiple pieces of anode active material-coated graphene sheets into a secondary particle having a size less than pm; wherein said graphene material is in an amount of from 0.1 % to 99.5 % by weight and said anode active material is in an amount of at least 0.5 % by weight, all based on the total weight of said graphene material and said anode active material combined.
The process of claim 1, wherein said graphene material is selected from pristine graphene, graphene oxide, reduced graphene oxide, graphene fluoride, graphene bromide, graphene iodide, boron-doped graphene, nitrogen-doped graphene, chemically functionalized graphene, or a combination thereof, and said graphene material comprises single-layer or less than 10 graphene planes.
The process of claim 1, wherein said anode active material comprises Sn or Si as a primary element with Si or Sn content no less than 20 % by weight based on the total weight of the anode active material. 2
The process of claim 1, wherein said anode active material comprises an element selected from Si, Ge, Sn, Cd, Sb, Pb, Bi, Zn, Al, Co, Ni, or Ti.
The process of claim 1, wherein said anode active material is selected from the group consisting of: (A) silicon (Si), germanium (Ge), tin (Sn), lead (Pb), antimony (Sb), bismuth (Bi), zin c (Zn), aluminum (Al), titanium (Ti), nickel (Ni), cobalt (Co), and cadmium (Cd); (B) alloys or intermetallic compounds of Si, Ge, Sn, Pb, Sb, Bi, Zn, Al, Ti, Ni, Co, or Cd with other elements, wherein said alloys or compounds are stoichiometric or non- stoichiometric; (C) oxides, carbides, nitrides, sulfides, phosphides, selenides, and tellurides of Si, Ge, Sn, Pb, Sb, Bi, Zn, Al, Ti, Fe, Ni, Co, or Cd, and their mixtures, composites, or lithium- containing composites; (D) salts and hydroxides of Sn; (E) lithium titanate, lithium manganate, lithium aluminate, lithium-containing titanium oxide, lithium transition metal oxide; and (F) combinations thereof.
The process of claim 1, wherein said continuous film of a graphene material is produced by spraying a graphene suspension onto a solid substrate, wherein said graphene suspension contains a graphene material dispersed in a liquid medium, and by removing said liquid medium.
The process of claim 1, wherein said continuous film of a graphene material is produced by chemical vapor deposition of a graphene material onto a solid substrate.
The process of claim 1, wherein said coated film of an anode active material- coated graphene material has an anode active material coating thickness less than 500 nm.
The process of claim 1, wherein said coated film of an anode active material- coated graphene material has an anode active material coating thickness less than 100 nm.
The process of claim 1, wherein said coated film of an anode active material- coated graphene material has an anode active material coating thickness less than 20 nm. 3
The process of claim 1, wherein said step (b) of forming an anode active material- coated graphene material entails chemical vapor deposition, physical vapor deposition, sputtering, or laser-assisted thin-film deposition of an anode active material onto a film of a graphene material.
The process of claim 1, wherein said step (c) of mechanical breaking entails air jet milling, impact milling, grinding, mechanical shearing, ultrasonication, or a combination thereof.
The process of claim 1, further comprising step of shaping said multiple pieces of anode active material-coated graphene sheets into a secondary particle having a size less than 5 pm.
The process of claim 1, wherein said step (b) further comprises depositing a layer of carbon or graphite material onto a surface of said film of an anode active material-coated graphene material.
The process of claim 1, wherein said step of shaping said multiple pieces of anode active material-coated graphene sheets into a secondary particle comprises dispersing said multiple pieces of anode active material-coated graphene sheets in a liquid medium to form a multicomponent suspension and drying said multi-component suspension to form said secondary particle using a spray-drying, spray-pyrolysis, fluidized-bed drying, atomization, or aerosolizing step.
The process of claim 1, wherein said step (a) of providing a continuous film of a graphene material includes feeding said continuous film from a feeder roller into said deposition zone and said step (b) further includes collecting said coated film onto a winding roller.
The process of claim 1, further comprising a step of separating or removing said graphene sheet from said anode active materials and a step of collecting said anode active material.
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A process for producing an anode active material-coated graphene sheet for a lithium battery, said process comprising: (A) providing a continuous film of a graphene material into a deposition zone; (B) introducing vapor or atoms of a precursor anode active material into said deposition zone and depositing said vapor or atoms onto a surface of said graphene material to form a coated continuous film of an anode active material-coated graphene material; (C) mechanically breaking said coated continuous film 4 into multiple pieces of anode active material-coated graphene sheets, wherein said graphene sheet has two opposed parallel surfaces and at least 50 % area of one of said surfaces is coated with an anode active material; and (D) mixing said multiple pieces of anode active material-coated graphene sheets and a resin binder and/or a conductive filler to form an anode layer; wherein said graphene material is in an amount of from 0.1 % to 99.5 % by weight and said anode active material is in an amount of at least 0.5 % by weight, all based on the total weight of said graphene material and said anode active material combined.
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Layer stacks claimed or described, ordered top of device to substrate.
anode layer for lithium battery
Materials described outside the worked examples.
graphene material
pristine graphene
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG.3 SEM image of a graphene-enhanced anode particulate (secondary particle) according to a preferred embodiment of the present invention. 9
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Duration | 15–60 seconds | — |
Thickness |
Related documents with shared materials, methods, properties, or citations.
POLYMER FUNCTIONALIZED GRAPHENE OXIDE AND THERMALLY RESPONSIVE ION PERMEABLE MEMBRANES MADE THEREFROM
Supercapacitor electrode having highly oriented and closely packed graphene sheets and production process
Patent
Atlas literature
Patent
US 9,564,630Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1 Schematic of a prior art anode active material (e.g., Si particles) that tends to undergo 25 pulverization during battery cha r ge-discha r ge cycling.
FIG.2 Schematic of a process for producing anode active material-coated graphene sheets (e.g. Si-, Sn-, and Sn02- coated graphene, graphene oxide, graphene …
FIG.3 SEM image of a graphene-enhanced anode particulate (secondary particle) according to a preferred embodiment of the present invention. 9
FIG. 4 The Si coating volume fraction of Si-coated graphene sheets plotted as a function of the Si coating thickness for various graphene platelet thickness …
FIG. 5 (A) schematic of a prior art lithium-ion battery cell composed of an anode current collector, an anode electrode (e.g. thin Si coating layer), a porous …
FIG.6 (A) a prior art anode containing a thin film Si coated on a sheet of Cu foil current collector; (B) an example of a Si-coated graphene sheet of the …
FIG.7 Cycling behaviors of three lithium-ion batteries having a graphene-supported Si coating, 10 a graphene/Si nano particle mixture, and a carbon nano fiber …
FIG.8 Cycling behaviors of a lithium-ion battery having a graphene- supported Sn coating anode of the present invention and those of a battery containing a …
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A process for producing an anode active material-coated graphene sheet for a lithium battery, said process comprising: (a) providing a continuous film of a graphene material into a deposition zone; (b) introducing vapor or atoms of a precursor anode active material into said deposition zone and depositing said vapor or atoms onto a surface of said graphene material to form a coated continuous film of an anode active material-coated graphene material; (c) mechanically breaking said coated continuous film into multiple pieces of anode active material-coated graphene sheets, wherein said graphene sheet has two opposed parallel surfaces and at least 50 % area of one of said surfaces is coated with an anode active material; and (d) shaping said multiple pieces of anode active material-coated graphene sheets into a secondary particle having a size less than pm; wherein said graphene material is in an amount of from 0.1 % to 99.5 % by weight and said anode active material is in an amount of at least 0.5 % by weight, all based on the total weight of said graphene material and said anode active material combined.
The process of claim 1, wherein said graphene material is selected from pristine graphene, graphene oxide, reduced graphene oxide, graphene fluoride, graphene bromide, graphene iodide, boron-doped graphene, nitrogen-doped graphene, chemically functionalized graphene, or a combination thereof, and said graphene material comprises single-layer or less than 10 graphene planes.
The process of claim 1, wherein said anode active material comprises Sn or Si as a primary element with Si or Sn content no less than 20 % by weight based on the total weight of the anode active material. 2
The process of claim 1, wherein said anode active material comprises an element selected from Si, Ge, Sn, Cd, Sb, Pb, Bi, Zn, Al, Co, Ni, or Ti.
The process of claim 1, wherein said anode active material is selected from the group consisting of: (A) silicon (Si), germanium (Ge), tin (Sn), lead (Pb), antimony (Sb), bismuth (Bi), zin c (Zn), aluminum (Al), titanium (Ti), nickel (Ni), cobalt (Co), and cadmium (Cd); (B) alloys or intermetallic compounds of Si, Ge, Sn, Pb, Sb, Bi, Zn, Al, Ti, Ni, Co, or Cd with other elements, wherein said alloys or compounds are stoichiometric or non- stoichiometric; (C) oxides, carbides, nitrides, sulfides, phosphides, selenides, and tellurides of Si, Ge, Sn, Pb, Sb, Bi, Zn, Al, Ti, Fe, Ni, Co, or Cd, and their mixtures, composites, or lithium- containing composites; (D) salts and hydroxides of Sn; (E) lithium titanate, lithium manganate, lithium aluminate, lithium-containing titanium oxide, lithium transition metal oxide; and (F) combinations thereof.
The process of claim 1, wherein said continuous film of a graphene material is produced by spraying a graphene suspension onto a solid substrate, wherein said graphene suspension contains a graphene material dispersed in a liquid medium, and by removing said liquid medium.
The process of claim 1, wherein said continuous film of a graphene material is produced by chemical vapor deposition of a graphene material onto a solid substrate.
The process of claim 1, wherein said coated film of an anode active material- coated graphene material has an anode active material coating thickness less than 500 nm.
The process of claim 1, wherein said coated film of an anode active material- coated graphene material has an anode active material coating thickness less than 100 nm.
The process of claim 1, wherein said coated film of an anode active material- coated graphene material has an anode active material coating thickness less than 20 nm. 3
The process of claim 1, wherein said step (b) of forming an anode active material- coated graphene material entails chemical vapor deposition, physical vapor deposition, sputtering, or laser-assisted thin-film deposition of an anode active material onto a film of a graphene material.
The process of claim 1, wherein said step (c) of mechanical breaking entails air jet milling, impact milling, grinding, mechanical shearing, ultrasonication, or a combination thereof.
The process of claim 1, further comprising step of shaping said multiple pieces of anode active material-coated graphene sheets into a secondary particle having a size less than 5 pm.
The process of claim 1, wherein said step (b) further comprises depositing a layer of carbon or graphite material onto a surface of said film of an anode active material-coated graphene material.
The process of claim 1, wherein said step of shaping said multiple pieces of anode active material-coated graphene sheets into a secondary particle comprises dispersing said multiple pieces of anode active material-coated graphene sheets in a liquid medium to form a multicomponent suspension and drying said multi-component suspension to form said secondary particle using a spray-drying, spray-pyrolysis, fluidized-bed drying, atomization, or aerosolizing step.
The process of claim 1, wherein said step (a) of providing a continuous film of a graphene material includes feeding said continuous film from a feeder roller into said deposition zone and said step (b) further includes collecting said coated film onto a winding roller.
The process of claim 1, further comprising a step of separating or removing said graphene sheet from said anode active materials and a step of collecting said anode active material.
. canceled
A process for producing an anode active material-coated graphene sheet for a lithium battery, said process comprising: (A) providing a continuous film of a graphene material into a deposition zone; (B) introducing vapor or atoms of a precursor anode active material into said deposition zone and depositing said vapor or atoms onto a surface of said graphene material to form a coated continuous film of an anode active material-coated graphene material; (C) mechanically breaking said coated continuous film 4 into multiple pieces of anode active material-coated graphene sheets, wherein said graphene sheet has two opposed parallel surfaces and at least 50 % area of one of said surfaces is coated with an anode active material; and (D) mixing said multiple pieces of anode active material-coated graphene sheets and a resin binder and/or a conductive filler to form an anode layer; wherein said graphene material is in an amount of from 0.1 % to 99.5 % by weight and said anode active material is in an amount of at least 0.5 % by weight, all based on the total weight of said graphene material and said anode active material combined.
. canceled
. canceled
. canceled
. canceled
. canceled
. canceled
Layer stacks claimed or described, ordered top of device to substrate.
anode layer for lithium battery
Materials described outside the worked examples.
graphene material
pristine graphene
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG.3 SEM image of a graphene-enhanced anode particulate (secondary particle) according to a preferred embodiment of the present invention. 9
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Duration | 15–60 seconds | — |
Thickness |
Related documents with shared materials, methods, properties, or citations.
POLYMER FUNCTIONALIZED GRAPHENE OXIDE AND THERMALLY RESPONSIVE ION PERMEABLE MEMBRANES MADE THEREFROM
Supercapacitor electrode having highly oriented and closely packed graphene sheets and production process
Patent
Atlas literature
Patent
US 9,564,630Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1 Schematic of a prior art anode active material (e.g., Si particles) that tends to undergo 25 pulverization during battery cha r ge-discha r ge cycling.
FIG.2 Schematic of a process for producing anode active material-coated graphene sheets (e.g. Si-, Sn-, and Sn02- coated graphene, graphene oxide, graphene …
FIG.3 SEM image of a graphene-enhanced anode particulate (secondary particle) according to a preferred embodiment of the present invention. 9
FIG. 4 The Si coating volume fraction of Si-coated graphene sheets plotted as a function of the Si coating thickness for various graphene platelet thickness …
FIG. 5 (A) schematic of a prior art lithium-ion battery cell composed of an anode current collector, an anode electrode (e.g. thin Si coating layer), a porous …
FIG.6 (A) a prior art anode containing a thin film Si coated on a sheet of Cu foil current collector; (B) an example of a Si-coated graphene sheet of the …
FIG.7 Cycling behaviors of three lithium-ion batteries having a graphene-supported Si coating, 10 a graphene/Si nano particle mixture, and a carbon nano fiber …
FIG.8 Cycling behaviors of a lithium-ion battery having a graphene- supported Sn coating anode of the present invention and those of a battery containing a …
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A process for producing an anode active material-coated graphene sheet for a lithium battery, said process comprising: (a) providing a continuous film of a graphene material into a deposition zone; (b) introducing vapor or atoms of a precursor anode active material into said deposition zone and depositing said vapor or atoms onto a surface of said graphene material to form a coated continuous film of an anode active material-coated graphene material; (c) mechanically breaking said coated continuous film into multiple pieces of anode active material-coated graphene sheets, wherein said graphene sheet has two opposed parallel surfaces and at least 50 % area of one of said surfaces is coated with an anode active material; and (d) shaping said multiple pieces of anode active material-coated graphene sheets into a secondary particle having a size less than pm; wherein said graphene material is in an amount of from 0.1 % to 99.5 % by weight and said anode active material is in an amount of at least 0.5 % by weight, all based on the total weight of said graphene material and said anode active material combined.
The process of claim 1, wherein said graphene material is selected from pristine graphene, graphene oxide, reduced graphene oxide, graphene fluoride, graphene bromide, graphene iodide, boron-doped graphene, nitrogen-doped graphene, chemically functionalized graphene, or a combination thereof, and said graphene material comprises single-layer or less than 10 graphene planes.
The process of claim 1, wherein said anode active material comprises Sn or Si as a primary element with Si or Sn content no less than 20 % by weight based on the total weight of the anode active material. 2
The process of claim 1, wherein said anode active material comprises an element selected from Si, Ge, Sn, Cd, Sb, Pb, Bi, Zn, Al, Co, Ni, or Ti.
The process of claim 1, wherein said anode active material is selected from the group consisting of: (A) silicon (Si), germanium (Ge), tin (Sn), lead (Pb), antimony (Sb), bismuth (Bi), zin c (Zn), aluminum (Al), titanium (Ti), nickel (Ni), cobalt (Co), and cadmium (Cd); (B) alloys or intermetallic compounds of Si, Ge, Sn, Pb, Sb, Bi, Zn, Al, Ti, Ni, Co, or Cd with other elements, wherein said alloys or compounds are stoichiometric or non- stoichiometric; (C) oxides, carbides, nitrides, sulfides, phosphides, selenides, and tellurides of Si, Ge, Sn, Pb, Sb, Bi, Zn, Al, Ti, Fe, Ni, Co, or Cd, and their mixtures, composites, or lithium- containing composites; (D) salts and hydroxides of Sn; (E) lithium titanate, lithium manganate, lithium aluminate, lithium-containing titanium oxide, lithium transition metal oxide; and (F) combinations thereof.
The process of claim 1, wherein said continuous film of a graphene material is produced by spraying a graphene suspension onto a solid substrate, wherein said graphene suspension contains a graphene material dispersed in a liquid medium, and by removing said liquid medium.
The process of claim 1, wherein said continuous film of a graphene material is produced by chemical vapor deposition of a graphene material onto a solid substrate.
The process of claim 1, wherein said coated film of an anode active material- coated graphene material has an anode active material coating thickness less than 500 nm.
The process of claim 1, wherein said coated film of an anode active material- coated graphene material has an anode active material coating thickness less than 100 nm.
The process of claim 1, wherein said coated film of an anode active material- coated graphene material has an anode active material coating thickness less than 20 nm. 3
The process of claim 1, wherein said step (b) of forming an anode active material- coated graphene material entails chemical vapor deposition, physical vapor deposition, sputtering, or laser-assisted thin-film deposition of an anode active material onto a film of a graphene material.
The process of claim 1, wherein said step (c) of mechanical breaking entails air jet milling, impact milling, grinding, mechanical shearing, ultrasonication, or a combination thereof.
The process of claim 1, further comprising step of shaping said multiple pieces of anode active material-coated graphene sheets into a secondary particle having a size less than 5 pm.
The process of claim 1, wherein said step (b) further comprises depositing a layer of carbon or graphite material onto a surface of said film of an anode active material-coated graphene material.
The process of claim 1, wherein said step of shaping said multiple pieces of anode active material-coated graphene sheets into a secondary particle comprises dispersing said multiple pieces of anode active material-coated graphene sheets in a liquid medium to form a multicomponent suspension and drying said multi-component suspension to form said secondary particle using a spray-drying, spray-pyrolysis, fluidized-bed drying, atomization, or aerosolizing step.
The process of claim 1, wherein said step (a) of providing a continuous film of a graphene material includes feeding said continuous film from a feeder roller into said deposition zone and said step (b) further includes collecting said coated film onto a winding roller.
The process of claim 1, further comprising a step of separating or removing said graphene sheet from said anode active materials and a step of collecting said anode active material.
. canceled
A process for producing an anode active material-coated graphene sheet for a lithium battery, said process comprising: (A) providing a continuous film of a graphene material into a deposition zone; (B) introducing vapor or atoms of a precursor anode active material into said deposition zone and depositing said vapor or atoms onto a surface of said graphene material to form a coated continuous film of an anode active material-coated graphene material; (C) mechanically breaking said coated continuous film 4 into multiple pieces of anode active material-coated graphene sheets, wherein said graphene sheet has two opposed parallel surfaces and at least 50 % area of one of said surfaces is coated with an anode active material; and (D) mixing said multiple pieces of anode active material-coated graphene sheets and a resin binder and/or a conductive filler to form an anode layer; wherein said graphene material is in an amount of from 0.1 % to 99.5 % by weight and said anode active material is in an amount of at least 0.5 % by weight, all based on the total weight of said graphene material and said anode active material combined.
. canceled
. canceled
. canceled
. canceled
. canceled
. canceled
Layer stacks claimed or described, ordered top of device to substrate.
anode layer for lithium battery
Materials described outside the worked examples.
graphene material
pristine graphene
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG.3 SEM image of a graphene-enhanced anode particulate (secondary particle) according to a preferred embodiment of the present invention. 9
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Duration | 15–60 seconds | — |
Thickness |
Related documents with shared materials, methods, properties, or citations.
POLYMER FUNCTIONALIZED GRAPHENE OXIDE AND THERMALLY RESPONSIVE ION PERMEABLE MEMBRANES MADE THEREFROM
Supercapacitor electrode having highly oriented and closely packed graphene sheets and production process
graphene oxide
reduced graphene oxide
graphene fluoride
anode active material
silicon
Si
germanium
Ge
tin
Sn
lithium titanate
carbon or graphite material
FIG. 4 The Si coating volume fraction of Si-coated graphene sheets plotted as a function of the Si coating thickness for various graphene platelet thickness …
| 4–5 nm |
| — |
Temperature | 500–1000 °C | — |
Duration | 1–2 hours | — |
Thickness | ≤ 1 nm | — |
Thickness | ≤ 20 nm | — |
Pressure | ≥ 22.1 MPa | — |
Thickness | ≤ 500 nm | — |
graphene oxide
reduced graphene oxide
graphene fluoride
anode active material
silicon
Si
germanium
Ge
tin
Sn
lithium titanate
carbon or graphite material
FIG. 4 The Si coating volume fraction of Si-coated graphene sheets plotted as a function of the Si coating thickness for various graphene platelet thickness …
| 4–5 nm |
| — |
Temperature | 500–1000 °C | — |
Duration | 1–2 hours | — |
Thickness | ≤ 1 nm | — |
Thickness | ≤ 20 nm | — |
Pressure | ≥ 22.1 MPa | — |
Thickness | ≤ 500 nm | — |
graphene oxide
reduced graphene oxide
graphene fluoride
anode active material
silicon
Si
germanium
Ge
tin
Sn
lithium titanate
carbon or graphite material
FIG. 4 The Si coating volume fraction of Si-coated graphene sheets plotted as a function of the Si coating thickness for various graphene platelet thickness …
| 4–5 nm |
| — |
Temperature | 500–1000 °C | — |
Duration | 1–2 hours | — |
Thickness | ≤ 1 nm | — |
Thickness | ≤ 20 nm | — |
Pressure | ≥ 22.1 MPa | — |
Thickness | ≤ 500 nm | — |
graphene oxide
reduced graphene oxide
graphene fluoride
anode active material
silicon
Si
germanium
Ge
tin
Sn
lithium titanate
carbon or graphite material
FIG. 4 The Si coating volume fraction of Si-coated graphene sheets plotted as a function of the Si coating thickness for various graphene platelet thickness …
| 4–5 nm |
| — |
Temperature | 500–1000 °C | — |
Duration | 1–2 hours | — |
Thickness | ≤ 1 nm | — |
Thickness | ≤ 20 nm | — |
Pressure | ≥ 22.1 MPa | — |
Thickness | ≤ 500 nm | — |