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Doped graphene electrode material, macro preparation method and application of doped graphene electrode material

A graphene electrode, graphene technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as graphene electrode instability, achieve low cost, simple process flow, and improve electrical conductivity and thermal stability.

Inactive Publication Date: 2012-01-04
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a doped graphene electrode material and its macro preparation method and its application in large-capacity, high-rate lithium-ion batteries, to solve the instability problem of graphene electrodes prepared by chemical exfoliation

Method used

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  • Doped graphene electrode material, macro preparation method and application of doped graphene electrode material
  • Doped graphene electrode material, macro preparation method and application of doped graphene electrode material
  • Doped graphene electrode material, macro preparation method and application of doped graphene electrode material

Examples

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Embodiment 1

[0030] The lateral size prepared by chemical peeling method is 500nm~1μm, the number of layers is 1~3 layers, and the conductivity is 1×10 3 S / cm graphene is used as a raw material, and graphene (50 mg) with a C / O ratio (carbon-oxygen atomic ratio) of 10 is put into a SiC tube (1.5 m long and 40 mm in outer diameter), and under the protection of argon, The temperature was raised to 650°C at a heating rate of 10°C / min, and NH 3 (~99.0% pure by volume), retaining NH 3 The mixing volume ratio of argon and argon is 1:2, react for 1 h, and obtain nitrogen-doped graphene with a nitrogen content of 2.0 at%. Mix nitrogen-doped graphene, conductive carbon black, and polyvinylidene fluoride binder in a certain mass ratio (80:10:10), add N-methylpyrrolidone accounting for 200wt% of the mixture, and grind to form Uniform paste, then apply the slurry on Cu foil, dry at 100°C for 5h, make N-methylpyrrolidone volatilize, cut and press into tablets, dry at 100°C for 20h under vacuum as the ...

Embodiment 2

[0032] The difference from Example 1 is:

[0033] The lateral size prepared by chemical peeling method is 500nm~5μm, the number of layers is 1~3 layers, and the conductivity is 2×10 3 S / cm graphene is used as the raw material, graphene (50mg) with a C / O ratio of 9 is placed in a SiC tube (1.5m long, 40mm outer diameter), and the temperature is raised at 20°C / min under the protection of helium The temperature was raised to 700°C, and the NH 3 (~99.0% pure by volume), retaining NH 3 The mixing volume ratio of argon and argon is 1:3, react for 2 hours, and obtain nitrogen-doped graphene with a nitrogen content of 3.1 at%. Mix nitrogen-doped graphene, conductive carbon black, and polyvinylidene fluoride binder in a certain mass ratio (80:10:10), add N-methylpyrrolidone accounting for 300wt% of the mixture, and grind it into Uniform paste, then apply the slurry on Cu foil, dry at 100°C for 5h, make N-methylpyrrolidone volatilize, cut and press into tablets, dry at 100°C for 20h ...

Embodiment 3

[0035] The difference from Example 1 is:

[0036] The lateral size prepared by chemical peeling method is 500nm~5μm, the number of layers is 1~3 layers, and the conductivity is 2×10 3 S / cm graphene is used as raw material, graphene (150mg) with a C / O ratio of 9 is put into a SiC tube (1.5m long, 40mm outer diameter), and the temperature is raised at 30°C / min under the protection of helium The temperature was raised to 600°C, and the NH 3 (~99.0% pure by volume), retaining NH 3 The mixing volume ratio of argon and argon is 1:4, react for 4 hours, and obtain nitrogen-doped graphene with a nitrogen content of 3.2 at%. Mix nitrogen-doped graphene, conductive carbon black, and polyvinylidene fluoride binder in a certain mass ratio (70:15:15), add N-methylpyrrolidone accounting for 400wt% of the mixture, and grind it into Uniform paste, then apply the paste on Cu foil, dry at 110°C for 2h, make N-methylpyrrolidone volatilize, cut, press into pieces, dry at 100°C for 24h in vacuum...

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Abstract

The invention relates to the field of graphene electrode materials, and in particular relates to a doped graphene electrode material, a macro preparation method as well as an application of the doped graphene electrode material in a high-capacity high-multiplying-power lithium ion battery. In the invention, graphene is taken as a raw material. The preparation method comprises the following steps: controlling the temperature rising speed rate through shielding gas; introducing gas containing nitrogen or boron elements in different concentrations at high temperature so as to realize the doping of heteroatoms of the graphene, and get the nitrogen or boron doped graphene; mixing the doped graphene, conductive carbon black and a bonding agent; adding a solvent; coating the mixture on a current collector after grinding; taking the mixture after drying, shearing and tabletting as a working electrode; adding electrolyte containing a lithium salt by taking a lithium plate as a counter electrode / reference electrode; assembling into a button-type lithium ion half-battery in a glove box; and carrying out constant current charge and discharge tests under the condition of high current density. According to the invention, the electrode stability of the material under the condition of high current density is improved, and the fact that the doped graphene has higher specific capacity and excellent cycle performance in a shorter time is realized.

Description

Technical field: [0001] The invention relates to the field of graphene electrode materials, in particular to a doped graphene electrode material and its macro-preparation method and application in large-capacity, high-rate lithium-ion batteries. Background technique: [0002] The two major problems of environmental pollution and energy crisis have made the demand for high-power and high-energy energy storage devices increasingly urgent in modern society, especially renewable energy, various portable mobile devices and new energy hybrid electric vehicles, plug-in electric vehicles and pure electric vehicles. Development of electric vehicles. Lithium-ion batteries using traditional electrode materials such as graphite and lithium cobaltate as electrodes can only provide low power, far lower than supercapacitors, and can no longer meet the needs of society. At present, simultaneously achieving high specific power and specific energy in a short charging and discharging time (mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/133H01M4/1393
CPCY02E60/122Y02E60/10
Inventor 任文才吴忠帅许力李峰成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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