Graphene-based composite negative electrode material and preparation method thereof

A negative electrode material, graphene-based technology, applied in the field of graphene-based composite negative electrode materials and its preparation, can solve the problems of unstable structure, low specific capacity, low tap density, etc., achieve good adhesion and reduce specific surface area , the effect of thin coating thickness

Active Publication Date: 2017-11-24
CHINA AVIATION LITHIUM BATTERY LUOYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many deficiencies in this method, the most important of which are its low specific capacity, low tap density, and unstable structure, which are greatly limited in the application of negative electrode materials for lithium batteries.

Method used

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  • Graphene-based composite negative electrode material and preparation method thereof
  • Graphene-based composite negative electrode material and preparation method thereof
  • Graphene-based composite negative electrode material and preparation method thereof

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Embodiment 1

[0036] The preparation method of the graphene-based composite negative electrode material of the present embodiment comprises the following steps:

[0037] (1) To 1000mL of graphene oxide dispersion with a concentration of 10mg / mL, add 5mL of hydrogen peroxide with a mass fraction of 10% and 0.375g of pyrrole and mix evenly, then add 3.75g of methyl orthosilicate material and mix evenly , to get a mixed solution;

[0038] (2) Put the mixed solution in step (1) in a high-pressure reactor and conduct a hydrothermal reaction at 180°C for 6 hours. After cooling, filter, dry, and press into tablets, and then heat up to 850°C in an argon atmosphere for carbonization for 3 hours. , and then naturally cooled to room temperature to obtain a nitrogen-doped graphene and silicon dioxide composite material;

[0039] (3) Dissolve 1g of polyvinylpyrrolidone in 100mL of twice-distilled water and disperse evenly to obtain a solution of polyvinylpyrrolidone; dissolve 1g of polystyrenesulfonic ...

Embodiment 2

[0042] The preparation method of the present embodiment comprises the steps:

[0043] (1) To 1000mL of graphene oxide dispersion with a concentration of 5mg / mL, add 1mL of hydrogen peroxide with a mass fraction of 30% and 0.25g of melamine and mix evenly, then add 2.5g tetraethyl orthosilicate material and mix evenly , to get a mixed solution;

[0044] (2) Put the mixed solution in step (1) in a high-pressure reactor and conduct a hydrothermal reaction at 180°C for 6 hours, after cooling, filter, dry, press into tablets, and then carbonize in an argon atmosphere, wherein the carbonization conditions are : Raise the temperature at a rate of 5°C / min to 550°C for 2 hours, then raise the temperature to 850°C at a rate of 5°C / min and hold for 2 hours, then cool down to room temperature naturally to obtain a nitrogen-doped graphene and silicon dioxide composite material ;

[0045](3) Dissolve 0.1g of polyvinylpyrrolidone in 100mL double distilled water and disperse evenly to obtai...

Embodiment 3

[0048] The preparation method of the present embodiment comprises the steps:

[0049] (1) To 1000mL of graphene oxide dispersion with a concentration of 20mg / mL, add 20mL of hydrogen peroxide with a mass fraction of 1% and 0.67g of urea and mix evenly, then add 6.7g of propyl orthosilicate material and mix evenly , to get a mixed solution;

[0050] (2) Put the mixed solution in step (1) in a high-pressure reactor and conduct a hydrothermal reaction at 180°C for 6 hours, after cooling, filter, dry, press into tablets, and then carbonize in an argon atmosphere, wherein the carbonization conditions are : The temperature was raised to 850°C for 2 hours at a heating rate of 5°C / min, and then naturally cooled to room temperature to obtain a nitrogen-doped graphene and silicon dioxide composite material;

[0051] (3) Dissolve 10g of polyvinylpyrrolidone in 100mL of twice-distilled water, and disperse evenly to obtain a solution of polyvinylpyrrolidone; After uniform dispersion in d...

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Abstract

The invention relates to a graphene-based composite negative electrode material and a preparation method thereof, and belongs to the field of a lithium ion battery. The preparation method of the graphene-based composite negative electrode material comprises the steps of (1) sequentially adding hydrogen peroxide, a nitrogen doping agent and silicate ester into a graphene oxide dispersion liquid to obtain a mixed solution; (2) performing hydrothermal reaction on the mixed solution in the step (1), performing solid-liquid separation, drying and pressing the obtained solid, and performing carbonization in an inert gas atmosphere to obtain a nitrogen-doped graphene and silicon dioxide composite material; and (3) adding the nitrogen-doped graphene and silicon dioxide composite material in the step (2) into a mixed solution of polyvinylpyrrolidone and a conductive macromolecular polymer, adding a reducing agent, and performing reaction for 1-6 hours under 50-120 DEG C to prepare the graphene-based composite negative electrode material. The graphene-based composite negative electrode material prepared by the method is high in specific capacity, stable in structure and excellent in electrochemical performance, and has a wide prospect in the field of a lithium ion battery negative electrode material.

Description

technical field [0001] The invention relates to a graphene-based composite negative electrode material and a preparation method thereof, belonging to the field of lithium ion batteries. Background technique [0002] As the market's requirements for the cruising range of electric vehicles increase, lithium-ion batteries are required to have higher energy density, safety performance and rate performance. The anode material is the key material of the lithium-ion battery, and its performance plays an important role in the energy density, cycle performance, rate performance and safety performance of the lithium-ion battery. At present, the anode materials of lithium-ion batteries on the market are mainly graphite materials, but the material has a low gram capacity (372mAh / g), and the small interlayer spacing causes deviations in its rate performance and safety performance. Although researchers have replaced the current graphite materials with silicon-based and tin-based material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/60H01M10/0525
CPCH01M4/362H01M4/366H01M4/583H01M4/602H01M10/0525Y02E60/10
Inventor 赵晓锋怀永建张翔
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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