Patent
US 8,691,441Graphene-Enhanced Cathode Materials for Lithium Batteries
Aruna Zhamu, Guorong Chen, Jinjun Shi, Mingchao Wang et al.
US
Copyright © 2026 Matter42. All rights reserved.
Patent
Atlas literature
Patent
US 8,691,441Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1 (A) Schematic of a graphene-enhanced particulate according to a preferred embodiment of the present invention and (B) another particulate according to …
FIG. 2 SEM images of (A) primary LiFeP O 4 pa r ticles without graphene and (B) graphene- enhanced particulates comprising graphene sheets in and a r ound the …
FIG. 3 SEM image of graphene-enhanced particulates containing therein ca r bon-coated LiFePO 4 particles embraced by graphene sheets.
FIG. 4 Additional SEM images, at a lower magnification, of (A) primary LiFeP O 4 pa r ticles 20 without graphene (indicating a very broad particle size …
FIG. 5 (A) Electrical conductivity data of two dry electrodes, one containing presently invented graphene-enhanced particulates and the other containing a …
FIG. 6 A schematic illustrating that the graphene sheets disposed on the exterior surface of the particulates naturally form a 3-D network of …
FIG. 7 The first-cycle capacity of two full cells containing a graphene-enhanced cathode and a 5 ca r bon black-added cathode.
FIG. 8 The specific capacity responses as a function of the cycle number and discha r ge rate of Sample 4A (co-precipitated graphene-lithium mixed metal …
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A nano graphene-enhanced particulate for use as a lithium battery cathode active material, wherein said nano graphene-enhanced particulate consists of is fem ed- efa-sige-er a plurality of graphene sheets and a plurality of fine cathode active material particles with a size smaller than 10 p m, and the graphene sheets and the cathode active material particles are mutually bonded or agglomerated into said particulate with a at least one exterior graphene sheet embracing said particulate eath ede ative -material-particles, and wherein said nano graphene-enhanced particulate has an electrical conductivity no less than 1 0~ S/cm and said graphene is in an amount of from 0.01% to 30% by weight based on the total weight of graphene and the cathode active material particles combined.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein the amount of the graphene sheets is from 0.1% to 20% by weight of the total weight of graphene sheets and the cathode active material particles combined.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein the amount of the graphene sheets is from 0.5% to 10% by weight of the total weight of graphene sheets and the cathode active material particles combined.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said particulate has an electrical conductivity greater than 10-2 S/cm.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said particulate is spherical in shape.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said graphene sheets comprises single-layer graphene or few-layer graphene, wherein said 2 few-layer graphene is def in ed as a graphene platelet formed of less than 10 graphene planes.
(Previously amended) The nano graphene-enhanced particulate of claim 1, wherein said cathode active material pa r ticles a r e selected from the group consisting of lithium cobalt >xi de, lithium nickel oxide, lithium manganese oxide, lithium vanadium oxide, lithium- nixed metal oxide, lithium iron phosphate, lithium manganese phosphate, lithium vanadium phosphate, lithium mixed metal phosphates, metal sulfides, and combinations thereof.
(Previously amended) The nano graphene-enhanced particulate of claim 1, wherein said cathode active material particles in the nano graphene-enhanced pa r ticulate have a dimension smaller than 1 sm.
(Previously amended) The nano graphene-enhanced particulate of claim 1, wherein said cathode active material particles in the nano graphene-enhanced particulate have a dimension smaller than 100 nm.
(Previously amended) The nano graphene-enhanced particulate of claim 1, wherein said cathode active material particles a r e selected from the group consisting of lithium iron phosphate, lithium manganese phosphate, lithium vanadium phosphate, lithium mixed metal phosphates, and combinations thereof and wherein said cathode active material contains submicron or nano-scaled particles with a size less than 1 pm.
(Previously amended) The nano graphene-enhanced pa r ticulate of claim 1, wherein said cathode active material particles a r e selected from the group consisting of lithium iron phosphate, lithium manganese phosphate, lithium vanadium phosphate, lithium mixed netal phosphates, and combinations thereof and wherein said cathode active material contains submicron or nano-scaled pa r ticles with a size less than 100 nm.
(Previously amended) The nano graphene-enhanced particulate of claim 1, further comprising a carbon material in electronic contact with said cathode active material particles and a graphene sheet.
(Previously amended) The nano graphene-enhanced particulate of claim 1, further comprising a ca r bon material coated on at least one of said cathode active material 3 particles, wherein said ca r bon material is selected from polymeric carbon, amorphous car bon, chemical vapor deposition ca r bon, carbon black, acetylene black, activated car bon, f in e expanded graphite particle with a dimension smaller than 100 nm, artificial graphite particle, natural graphite particle, or a combination thereof.
(Previously amended) The nano graphene-enhanced particulate of claim 1, wherein said particulate is prepa r ed from a process comprising: (a) Preparing a precursor mixture of graphene or graphene precursor with a cathode active material or active material precursor; and (b) Thermally and/or chemically converting said precursor mixture to said graphene-enhanced cathode particulate.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said graphene sheets in said particulate have an oxygen content less than 25% by weight.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said graphene sheets in said particulates have an oxygen content less than 5% by weight.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said graphene sheets in said particulates have an oxygen content in the range of 5% to 25% by w eight.
A lithium battery cathode comprising multiple nano graphene-: nhanced e ath ede particulates of claim 1.
A lithium battery cathode comprising multiple nano graphene- enhanced eath ede pa r ticulates of claim 1, wherein said multiple nano graphene-enhanced par ticulates are packed together with graphene sheets forming a three-dimensional electron-conducting pathway.
Layer stacks claimed or described, ordered top of device to substrate.
nano graphene-enhanced particulate (cathode active material particulate)
lithium battery cathode
lithium battery
Materials described outside the worked examples.
graphene sheets
cathode active material particles
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG. 2 SEM images of (A) primary LiFeP O 4 pa r ticles without graphene and (B) graphene- enhanced particulates comprising graphene sheets in and a r ound the …
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
electrical conductivity of nano graphene-enhanced particulate (claimed minimum) | ≥ 1e-10 S/cm | cathode active material particles |
electrical conductivity of nano graphene-enhanced particulate (preferred minimum per description) |
Related documents with shared materials, methods, properties, or citations.
POROUS GRAPHENE NETWORK ELECTRODES AND AN ALL-CARBON LITHIUM ION BATTERY CONTAINING THE SAME
GRAPHENE OXIDE, POSITIVE ELECTRODE FOR NONAQUEOUS SECONDARY BATTERY USING GRAPHENE OXIDE, METHOD OF MANUFACTURING POSITIVE ELECTRODE FOR NONAQUEOUS SECONDARY BATTERY, NONAQUEOUS SECONDARY BATTERY, AND ELECTRONIC DEVICE
Patent
Atlas literature
Patent
US 8,691,441Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1 (A) Schematic of a graphene-enhanced particulate according to a preferred embodiment of the present invention and (B) another particulate according to …
FIG. 2 SEM images of (A) primary LiFeP O 4 pa r ticles without graphene and (B) graphene- enhanced particulates comprising graphene sheets in and a r ound the …
FIG. 3 SEM image of graphene-enhanced particulates containing therein ca r bon-coated LiFePO 4 particles embraced by graphene sheets.
FIG. 4 Additional SEM images, at a lower magnification, of (A) primary LiFeP O 4 pa r ticles 20 without graphene (indicating a very broad particle size …
FIG. 5 (A) Electrical conductivity data of two dry electrodes, one containing presently invented graphene-enhanced particulates and the other containing a …
FIG. 6 A schematic illustrating that the graphene sheets disposed on the exterior surface of the particulates naturally form a 3-D network of …
FIG. 7 The first-cycle capacity of two full cells containing a graphene-enhanced cathode and a 5 ca r bon black-added cathode.
FIG. 8 The specific capacity responses as a function of the cycle number and discha r ge rate of Sample 4A (co-precipitated graphene-lithium mixed metal …
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A nano graphene-enhanced particulate for use as a lithium battery cathode active material, wherein said nano graphene-enhanced particulate consists of is fem ed- efa-sige-er a plurality of graphene sheets and a plurality of fine cathode active material particles with a size smaller than 10 p m, and the graphene sheets and the cathode active material particles are mutually bonded or agglomerated into said particulate with a at least one exterior graphene sheet embracing said particulate eath ede ative -material-particles, and wherein said nano graphene-enhanced particulate has an electrical conductivity no less than 1 0~ S/cm and said graphene is in an amount of from 0.01% to 30% by weight based on the total weight of graphene and the cathode active material particles combined.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein the amount of the graphene sheets is from 0.1% to 20% by weight of the total weight of graphene sheets and the cathode active material particles combined.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein the amount of the graphene sheets is from 0.5% to 10% by weight of the total weight of graphene sheets and the cathode active material particles combined.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said particulate has an electrical conductivity greater than 10-2 S/cm.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said particulate is spherical in shape.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said graphene sheets comprises single-layer graphene or few-layer graphene, wherein said 2 few-layer graphene is def in ed as a graphene platelet formed of less than 10 graphene planes.
(Previously amended) The nano graphene-enhanced particulate of claim 1, wherein said cathode active material pa r ticles a r e selected from the group consisting of lithium cobalt >xi de, lithium nickel oxide, lithium manganese oxide, lithium vanadium oxide, lithium- nixed metal oxide, lithium iron phosphate, lithium manganese phosphate, lithium vanadium phosphate, lithium mixed metal phosphates, metal sulfides, and combinations thereof.
(Previously amended) The nano graphene-enhanced particulate of claim 1, wherein said cathode active material particles in the nano graphene-enhanced pa r ticulate have a dimension smaller than 1 sm.
(Previously amended) The nano graphene-enhanced particulate of claim 1, wherein said cathode active material particles in the nano graphene-enhanced particulate have a dimension smaller than 100 nm.
(Previously amended) The nano graphene-enhanced particulate of claim 1, wherein said cathode active material particles a r e selected from the group consisting of lithium iron phosphate, lithium manganese phosphate, lithium vanadium phosphate, lithium mixed metal phosphates, and combinations thereof and wherein said cathode active material contains submicron or nano-scaled particles with a size less than 1 pm.
(Previously amended) The nano graphene-enhanced pa r ticulate of claim 1, wherein said cathode active material particles a r e selected from the group consisting of lithium iron phosphate, lithium manganese phosphate, lithium vanadium phosphate, lithium mixed netal phosphates, and combinations thereof and wherein said cathode active material contains submicron or nano-scaled pa r ticles with a size less than 100 nm.
(Previously amended) The nano graphene-enhanced particulate of claim 1, further comprising a carbon material in electronic contact with said cathode active material particles and a graphene sheet.
(Previously amended) The nano graphene-enhanced particulate of claim 1, further comprising a ca r bon material coated on at least one of said cathode active material 3 particles, wherein said ca r bon material is selected from polymeric carbon, amorphous car bon, chemical vapor deposition ca r bon, carbon black, acetylene black, activated car bon, f in e expanded graphite particle with a dimension smaller than 100 nm, artificial graphite particle, natural graphite particle, or a combination thereof.
(Previously amended) The nano graphene-enhanced particulate of claim 1, wherein said particulate is prepa r ed from a process comprising: (a) Preparing a precursor mixture of graphene or graphene precursor with a cathode active material or active material precursor; and (b) Thermally and/or chemically converting said precursor mixture to said graphene-enhanced cathode particulate.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said graphene sheets in said particulate have an oxygen content less than 25% by weight.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said graphene sheets in said particulates have an oxygen content less than 5% by weight.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said graphene sheets in said particulates have an oxygen content in the range of 5% to 25% by w eight.
A lithium battery cathode comprising multiple nano graphene-: nhanced e ath ede particulates of claim 1.
A lithium battery cathode comprising multiple nano graphene- enhanced eath ede pa r ticulates of claim 1, wherein said multiple nano graphene-enhanced par ticulates are packed together with graphene sheets forming a three-dimensional electron-conducting pathway.
Layer stacks claimed or described, ordered top of device to substrate.
nano graphene-enhanced particulate (cathode active material particulate)
lithium battery cathode
lithium battery
Materials described outside the worked examples.
graphene sheets
cathode active material particles
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG. 2 SEM images of (A) primary LiFeP O 4 pa r ticles without graphene and (B) graphene- enhanced particulates comprising graphene sheets in and a r ound the …
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
electrical conductivity of nano graphene-enhanced particulate (claimed minimum) | ≥ 1e-10 S/cm | cathode active material particles |
electrical conductivity of nano graphene-enhanced particulate (preferred minimum per description) |
Related documents with shared materials, methods, properties, or citations.
POROUS GRAPHENE NETWORK ELECTRODES AND AN ALL-CARBON LITHIUM ION BATTERY CONTAINING THE SAME
GRAPHENE OXIDE, POSITIVE ELECTRODE FOR NONAQUEOUS SECONDARY BATTERY USING GRAPHENE OXIDE, METHOD OF MANUFACTURING POSITIVE ELECTRODE FOR NONAQUEOUS SECONDARY BATTERY, NONAQUEOUS SECONDARY BATTERY, AND ELECTRONIC DEVICE
Patent
Atlas literature
Patent
US 8,691,441Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1 (A) Schematic of a graphene-enhanced particulate according to a preferred embodiment of the present invention and (B) another particulate according to …
FIG. 2 SEM images of (A) primary LiFeP O 4 pa r ticles without graphene and (B) graphene- enhanced particulates comprising graphene sheets in and a r ound the …
FIG. 3 SEM image of graphene-enhanced particulates containing therein ca r bon-coated LiFePO 4 particles embraced by graphene sheets.
FIG. 4 Additional SEM images, at a lower magnification, of (A) primary LiFeP O 4 pa r ticles 20 without graphene (indicating a very broad particle size …
FIG. 5 (A) Electrical conductivity data of two dry electrodes, one containing presently invented graphene-enhanced particulates and the other containing a …
FIG. 6 A schematic illustrating that the graphene sheets disposed on the exterior surface of the particulates naturally form a 3-D network of …
FIG. 7 The first-cycle capacity of two full cells containing a graphene-enhanced cathode and a 5 ca r bon black-added cathode.
FIG. 8 The specific capacity responses as a function of the cycle number and discha r ge rate of Sample 4A (co-precipitated graphene-lithium mixed metal …
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A nano graphene-enhanced particulate for use as a lithium battery cathode active material, wherein said nano graphene-enhanced particulate consists of is fem ed- efa-sige-er a plurality of graphene sheets and a plurality of fine cathode active material particles with a size smaller than 10 p m, and the graphene sheets and the cathode active material particles are mutually bonded or agglomerated into said particulate with a at least one exterior graphene sheet embracing said particulate eath ede ative -material-particles, and wherein said nano graphene-enhanced particulate has an electrical conductivity no less than 1 0~ S/cm and said graphene is in an amount of from 0.01% to 30% by weight based on the total weight of graphene and the cathode active material particles combined.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein the amount of the graphene sheets is from 0.1% to 20% by weight of the total weight of graphene sheets and the cathode active material particles combined.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein the amount of the graphene sheets is from 0.5% to 10% by weight of the total weight of graphene sheets and the cathode active material particles combined.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said particulate has an electrical conductivity greater than 10-2 S/cm.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said particulate is spherical in shape.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said graphene sheets comprises single-layer graphene or few-layer graphene, wherein said 2 few-layer graphene is def in ed as a graphene platelet formed of less than 10 graphene planes.
(Previously amended) The nano graphene-enhanced particulate of claim 1, wherein said cathode active material pa r ticles a r e selected from the group consisting of lithium cobalt >xi de, lithium nickel oxide, lithium manganese oxide, lithium vanadium oxide, lithium- nixed metal oxide, lithium iron phosphate, lithium manganese phosphate, lithium vanadium phosphate, lithium mixed metal phosphates, metal sulfides, and combinations thereof.
(Previously amended) The nano graphene-enhanced particulate of claim 1, wherein said cathode active material particles in the nano graphene-enhanced pa r ticulate have a dimension smaller than 1 sm.
(Previously amended) The nano graphene-enhanced particulate of claim 1, wherein said cathode active material particles in the nano graphene-enhanced particulate have a dimension smaller than 100 nm.
(Previously amended) The nano graphene-enhanced particulate of claim 1, wherein said cathode active material particles a r e selected from the group consisting of lithium iron phosphate, lithium manganese phosphate, lithium vanadium phosphate, lithium mixed metal phosphates, and combinations thereof and wherein said cathode active material contains submicron or nano-scaled particles with a size less than 1 pm.
(Previously amended) The nano graphene-enhanced pa r ticulate of claim 1, wherein said cathode active material particles a r e selected from the group consisting of lithium iron phosphate, lithium manganese phosphate, lithium vanadium phosphate, lithium mixed netal phosphates, and combinations thereof and wherein said cathode active material contains submicron or nano-scaled pa r ticles with a size less than 100 nm.
(Previously amended) The nano graphene-enhanced particulate of claim 1, further comprising a carbon material in electronic contact with said cathode active material particles and a graphene sheet.
(Previously amended) The nano graphene-enhanced particulate of claim 1, further comprising a ca r bon material coated on at least one of said cathode active material 3 particles, wherein said ca r bon material is selected from polymeric carbon, amorphous car bon, chemical vapor deposition ca r bon, carbon black, acetylene black, activated car bon, f in e expanded graphite particle with a dimension smaller than 100 nm, artificial graphite particle, natural graphite particle, or a combination thereof.
(Previously amended) The nano graphene-enhanced particulate of claim 1, wherein said particulate is prepa r ed from a process comprising: (a) Preparing a precursor mixture of graphene or graphene precursor with a cathode active material or active material precursor; and (b) Thermally and/or chemically converting said precursor mixture to said graphene-enhanced cathode particulate.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said graphene sheets in said particulate have an oxygen content less than 25% by weight.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said graphene sheets in said particulates have an oxygen content less than 5% by weight.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said graphene sheets in said particulates have an oxygen content in the range of 5% to 25% by w eight.
A lithium battery cathode comprising multiple nano graphene-: nhanced e ath ede particulates of claim 1.
A lithium battery cathode comprising multiple nano graphene- enhanced eath ede pa r ticulates of claim 1, wherein said multiple nano graphene-enhanced par ticulates are packed together with graphene sheets forming a three-dimensional electron-conducting pathway.
Layer stacks claimed or described, ordered top of device to substrate.
nano graphene-enhanced particulate (cathode active material particulate)
lithium battery cathode
lithium battery
Materials described outside the worked examples.
graphene sheets
cathode active material particles
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG. 2 SEM images of (A) primary LiFeP O 4 pa r ticles without graphene and (B) graphene- enhanced particulates comprising graphene sheets in and a r ound the …
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
electrical conductivity of nano graphene-enhanced particulate (claimed minimum) | ≥ 1e-10 S/cm | cathode active material particles |
electrical conductivity of nano graphene-enhanced particulate (preferred minimum per description) |
Related documents with shared materials, methods, properties, or citations.
POROUS GRAPHENE NETWORK ELECTRODES AND AN ALL-CARBON LITHIUM ION BATTERY CONTAINING THE SAME
GRAPHENE OXIDE, POSITIVE ELECTRODE FOR NONAQUEOUS SECONDARY BATTERY USING GRAPHENE OXIDE, METHOD OF MANUFACTURING POSITIVE ELECTRODE FOR NONAQUEOUS SECONDARY BATTERY, NONAQUEOUS SECONDARY BATTERY, AND ELECTRONIC DEVICE
Patent
Atlas literature
Patent
US 8,691,441Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1 (A) Schematic of a graphene-enhanced particulate according to a preferred embodiment of the present invention and (B) another particulate according to …
FIG. 2 SEM images of (A) primary LiFeP O 4 pa r ticles without graphene and (B) graphene- enhanced particulates comprising graphene sheets in and a r ound the …
FIG. 3 SEM image of graphene-enhanced particulates containing therein ca r bon-coated LiFePO 4 particles embraced by graphene sheets.
FIG. 4 Additional SEM images, at a lower magnification, of (A) primary LiFeP O 4 pa r ticles 20 without graphene (indicating a very broad particle size …
FIG. 5 (A) Electrical conductivity data of two dry electrodes, one containing presently invented graphene-enhanced particulates and the other containing a …
FIG. 6 A schematic illustrating that the graphene sheets disposed on the exterior surface of the particulates naturally form a 3-D network of …
FIG. 7 The first-cycle capacity of two full cells containing a graphene-enhanced cathode and a 5 ca r bon black-added cathode.
FIG. 8 The specific capacity responses as a function of the cycle number and discha r ge rate of Sample 4A (co-precipitated graphene-lithium mixed metal …
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A nano graphene-enhanced particulate for use as a lithium battery cathode active material, wherein said nano graphene-enhanced particulate consists of is fem ed- efa-sige-er a plurality of graphene sheets and a plurality of fine cathode active material particles with a size smaller than 10 p m, and the graphene sheets and the cathode active material particles are mutually bonded or agglomerated into said particulate with a at least one exterior graphene sheet embracing said particulate eath ede ative -material-particles, and wherein said nano graphene-enhanced particulate has an electrical conductivity no less than 1 0~ S/cm and said graphene is in an amount of from 0.01% to 30% by weight based on the total weight of graphene and the cathode active material particles combined.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein the amount of the graphene sheets is from 0.1% to 20% by weight of the total weight of graphene sheets and the cathode active material particles combined.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein the amount of the graphene sheets is from 0.5% to 10% by weight of the total weight of graphene sheets and the cathode active material particles combined.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said particulate has an electrical conductivity greater than 10-2 S/cm.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said particulate is spherical in shape.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said graphene sheets comprises single-layer graphene or few-layer graphene, wherein said 2 few-layer graphene is def in ed as a graphene platelet formed of less than 10 graphene planes.
(Previously amended) The nano graphene-enhanced particulate of claim 1, wherein said cathode active material pa r ticles a r e selected from the group consisting of lithium cobalt >xi de, lithium nickel oxide, lithium manganese oxide, lithium vanadium oxide, lithium- nixed metal oxide, lithium iron phosphate, lithium manganese phosphate, lithium vanadium phosphate, lithium mixed metal phosphates, metal sulfides, and combinations thereof.
(Previously amended) The nano graphene-enhanced particulate of claim 1, wherein said cathode active material particles in the nano graphene-enhanced pa r ticulate have a dimension smaller than 1 sm.
(Previously amended) The nano graphene-enhanced particulate of claim 1, wherein said cathode active material particles in the nano graphene-enhanced particulate have a dimension smaller than 100 nm.
(Previously amended) The nano graphene-enhanced particulate of claim 1, wherein said cathode active material particles a r e selected from the group consisting of lithium iron phosphate, lithium manganese phosphate, lithium vanadium phosphate, lithium mixed metal phosphates, and combinations thereof and wherein said cathode active material contains submicron or nano-scaled particles with a size less than 1 pm.
(Previously amended) The nano graphene-enhanced pa r ticulate of claim 1, wherein said cathode active material particles a r e selected from the group consisting of lithium iron phosphate, lithium manganese phosphate, lithium vanadium phosphate, lithium mixed netal phosphates, and combinations thereof and wherein said cathode active material contains submicron or nano-scaled pa r ticles with a size less than 100 nm.
(Previously amended) The nano graphene-enhanced particulate of claim 1, further comprising a carbon material in electronic contact with said cathode active material particles and a graphene sheet.
(Previously amended) The nano graphene-enhanced particulate of claim 1, further comprising a ca r bon material coated on at least one of said cathode active material 3 particles, wherein said ca r bon material is selected from polymeric carbon, amorphous car bon, chemical vapor deposition ca r bon, carbon black, acetylene black, activated car bon, f in e expanded graphite particle with a dimension smaller than 100 nm, artificial graphite particle, natural graphite particle, or a combination thereof.
(Previously amended) The nano graphene-enhanced particulate of claim 1, wherein said particulate is prepa r ed from a process comprising: (a) Preparing a precursor mixture of graphene or graphene precursor with a cathode active material or active material precursor; and (b) Thermally and/or chemically converting said precursor mixture to said graphene-enhanced cathode particulate.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said graphene sheets in said particulate have an oxygen content less than 25% by weight.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said graphene sheets in said particulates have an oxygen content less than 5% by weight.
(Previously amended) The nano graphene-enhanced particulate of claim 1 wherein said graphene sheets in said particulates have an oxygen content in the range of 5% to 25% by w eight.
A lithium battery cathode comprising multiple nano graphene-: nhanced e ath ede particulates of claim 1.
A lithium battery cathode comprising multiple nano graphene- enhanced eath ede pa r ticulates of claim 1, wherein said multiple nano graphene-enhanced par ticulates are packed together with graphene sheets forming a three-dimensional electron-conducting pathway.
Layer stacks claimed or described, ordered top of device to substrate.
nano graphene-enhanced particulate (cathode active material particulate)
lithium battery cathode
lithium battery
Materials described outside the worked examples.
graphene sheets
cathode active material particles
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG. 2 SEM images of (A) primary LiFeP O 4 pa r ticles without graphene and (B) graphene- enhanced particulates comprising graphene sheets in and a r ound the …
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
electrical conductivity of nano graphene-enhanced particulate (claimed minimum) | ≥ 1e-10 S/cm | cathode active material particles |
electrical conductivity of nano graphene-enhanced particulate (preferred minimum per description) |
Related documents with shared materials, methods, properties, or citations.
POROUS GRAPHENE NETWORK ELECTRODES AND AN ALL-CARBON LITHIUM ION BATTERY CONTAINING THE SAME
GRAPHENE OXIDE, POSITIVE ELECTRODE FOR NONAQUEOUS SECONDARY BATTERY USING GRAPHENE OXIDE, METHOD OF MANUFACTURING POSITIVE ELECTRODE FOR NONAQUEOUS SECONDARY BATTERY, NONAQUEOUS SECONDARY BATTERY, AND ELECTRONIC DEVICE
lithium cobalt oxide
LiCoO₂
lithium nickel oxide
LiNiO₂
lithium manganese oxide
LiMnO₂
lithium vanadium oxide
lithium mixed metal oxide
lithium iron phosphate
LiFePO₄
lithium manganese phosphate
LiMnPO₄
lithium vanadium phosphate
metal sulfides
lithium mixed metal phosphates
carbon material
graphene oxide
graphene fluoride
FIG. 3 SEM image of graphene-enhanced particulates containing therein ca r bon-coated LiFePO 4 particles embraced by graphene sheets.
FIG. 4 Additional SEM images, at a lower magnification, of (A) primary LiFeP O 4 pa r ticles 20 without graphene (indicating a very broad particle size …
FIG. 5 (A) Electrical conductivity data of two dry electrodes, one containing presently invented graphene-enhanced particulates and the other containing a …
cathode active material particles |
Duration | 15–60 seconds | — |
Duration | 1–2 hours | — |
Thickness | ≤ 1 nm | — |
Pressure | ≥ 22.1 MPa | — |
lithium cobalt oxide
LiCoO₂
lithium nickel oxide
LiNiO₂
lithium manganese oxide
LiMnO₂
lithium vanadium oxide
lithium mixed metal oxide
lithium iron phosphate
LiFePO₄
lithium manganese phosphate
LiMnPO₄
lithium vanadium phosphate
metal sulfides
lithium mixed metal phosphates
carbon material
graphene oxide
graphene fluoride
FIG. 3 SEM image of graphene-enhanced particulates containing therein ca r bon-coated LiFePO 4 particles embraced by graphene sheets.
FIG. 4 Additional SEM images, at a lower magnification, of (A) primary LiFeP O 4 pa r ticles 20 without graphene (indicating a very broad particle size …
FIG. 5 (A) Electrical conductivity data of two dry electrodes, one containing presently invented graphene-enhanced particulates and the other containing a …
cathode active material particles |
Duration | 15–60 seconds | — |
Duration | 1–2 hours | — |
Thickness | ≤ 1 nm | — |
Pressure | ≥ 22.1 MPa | — |
lithium cobalt oxide
LiCoO₂
lithium nickel oxide
LiNiO₂
lithium manganese oxide
LiMnO₂
lithium vanadium oxide
lithium mixed metal oxide
lithium iron phosphate
LiFePO₄
lithium manganese phosphate
LiMnPO₄
lithium vanadium phosphate
metal sulfides
lithium mixed metal phosphates
carbon material
graphene oxide
graphene fluoride
FIG. 3 SEM image of graphene-enhanced particulates containing therein ca r bon-coated LiFePO 4 particles embraced by graphene sheets.
FIG. 4 Additional SEM images, at a lower magnification, of (A) primary LiFeP O 4 pa r ticles 20 without graphene (indicating a very broad particle size …
FIG. 5 (A) Electrical conductivity data of two dry electrodes, one containing presently invented graphene-enhanced particulates and the other containing a …
cathode active material particles |
Duration | 15–60 seconds | — |
Duration | 1–2 hours | — |
Thickness | ≤ 1 nm | — |
Pressure | ≥ 22.1 MPa | — |
lithium cobalt oxide
LiCoO₂
lithium nickel oxide
LiNiO₂
lithium manganese oxide
LiMnO₂
lithium vanadium oxide
lithium mixed metal oxide
lithium iron phosphate
LiFePO₄
lithium manganese phosphate
LiMnPO₄
lithium vanadium phosphate
metal sulfides
lithium mixed metal phosphates
carbon material
graphene oxide
graphene fluoride
FIG. 3 SEM image of graphene-enhanced particulates containing therein ca r bon-coated LiFePO 4 particles embraced by graphene sheets.
FIG. 4 Additional SEM images, at a lower magnification, of (A) primary LiFeP O 4 pa r ticles 20 without graphene (indicating a very broad particle size …
FIG. 5 (A) Electrical conductivity data of two dry electrodes, one containing presently invented graphene-enhanced particulates and the other containing a …
cathode active material particles |
Duration | 15–60 seconds | — |
Duration | 1–2 hours | — |
Thickness | ≤ 1 nm | — |
Pressure | ≥ 22.1 MPa | — |