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Carbon nanotube/graphene composite negative electrode material and preparation method thereof, lithium battery

A graphene composite and negative electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of composite material structure instability, low electronic conductivity, long process cycle, etc., achieve fast heating speed and reduce production costs , The effect of simple process

Inactive Publication Date: 2015-11-18
RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the embodiments of the present invention is to overcome the above-mentioned deficiencies of the prior art, and provide a carbon nanotube / graphene composite negative electrode material and a preparation method thereof, aiming at overcoming the disadvantages of the existing methods for preparing carbon nanotube / graphene composite negative electrode materials. There are technical problems such as uneven mixing, high energy consumption, long process cycle, unstable structure of the prepared composite material, low electron conductivity and high cost

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  • Carbon nanotube/graphene composite negative electrode material and preparation method thereof, lithium battery
  • Carbon nanotube/graphene composite negative electrode material and preparation method thereof, lithium battery

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preparation example Construction

[0022] The example of the present invention provides a method for preparing a carbon nanotube / graphene composite negative electrode material with high efficiency, low cost and stable structure. The technology of this carbon nanotube / graphene composite negative electrode material preparation method is as follows figure 1 As shown, it includes the following steps:

[0023] Step S01. Place the graphene powder and the catalyst for carbon source cracking in the microwave reaction chamber; wherein, the graphene powder is placed in the central area of ​​the microwave reaction chamber, and the catalyst is placed at the gas inlet end of the microwave reaction chamber ;

[0024] Step S02. Vacuumize the microwave reaction chamber and inject protective gas into it;

[0025] Step S03. Using microwave vapor deposition to grow carbon nanotubes on graphene substrates to prepare carbon nanotube / graphene composite anode materials: use microwaves to heat the reaction chamber to 400-1000°C, and...

Embodiment 1

[0046] The preparation method of the carbon nanotube / graphene composite negative electrode material of the present embodiment comprises the following specific steps:

[0047] 1) In this example, 0.2g of graphene is selected and dried in an oven at 100°C;

[0048] 2) In this example, 20mg of ferrocene was selected and dried in an oven at 80°C;

[0049] 3) Place the dried ferrocene and graphene in the front and center of the reaction chamber respectively, vacuumize to make the absolute pressure in the furnace lower than 1kPa, pass nitrogen to normal pressure and then vacuum, repeat this process three times. Before turning on the microwave, flow nitrogen gas into the reaction chamber to remove the oxygen remaining in the reaction chamber;

[0050] 4) Heat the reaction chamber with microwaves. When the temperature rises rapidly to the reaction temperature of 600°C, open the valve of the gas flow bottle, and feed methane gas and nitrogen gas at a volume ratio of 1:4, with a total ...

Embodiment 2

[0052] The preparation method of the carbon nanotube / graphene composite negative electrode material of the present embodiment comprises the following specific steps:

[0053] 1) In this example, 0.5g of graphene is selected and dried in an oven at 100°C;

[0054] 2) In this example, 60mg of ferrocene was selected and dried in an oven at 80°C;

[0055] 3) Place the dried ferrocene and graphene in the front and center of the reaction chamber respectively, vacuumize to make the absolute pressure in the furnace lower than 1kPa, pass nitrogen to normal pressure and then vacuum, repeat this process three times. Turn on the microwave and go to the reaction chamber to pass flowing nitrogen gas first to remove the oxygen remaining in the reaction chamber;

[0056] 4) Heat the reaction chamber with microwaves. When the temperature rises rapidly to the reaction temperature of 800°C, open the valve of the gas flow bottle, and feed methane gas and nitrogen gas at a volume ratio of 1:1, wi...

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Abstract

The invention discloses a carbon nano tube / graphene composite negative pole material, a preparation method thereof and a lithium battery. The preparation method of the carbon nano tube / graphene composite negative pole material comprises the steps of placing graphene powder and a catalyst for carbon source splitting decomposition in a microwave reaction cavity, vacuumizing the microwave reaction cavity and leading protective gas into the microwave reaction cavity and using a microwave vapor deposition method to prepare the carbon nano tube / graphene composite negative pole material on a graphene base body growing carbon nano tube. A negative pole of the lithium battery contains the carbon nano tube / graphene composite negative pole material. The preparation method of the carbon nano tube / graphene composite negative pole material adopts the microwave vapor deposition method to perform in-situ preparation of the carbon nano tube / graphene composite negative pole material, does not needs a pre-synthesis process, reduces the production cost, adopts microwave heating and is efficient, low in energy consumption and short in production period. Due to the fact that the lithium battery contains the carbon nano tube / graphene composite negative pole material, embedding and taking-out of lithium are facilitated, the inreversible capacity of first-time charging and discharging is reduced, and the lithium battery is good in safety and high in power.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a carbon nanotube / graphene composite negative electrode material, a preparation method thereof, and a lithium battery. Background technique [0002] As a new type of green power source, lithium-ion batteries have always been the focus of attention from all walks of life. Electrode materials are the key factors that determine the overall performance of lithium-ion batteries. Carbon materials have the advantages of high lithium storage capacity, abundant raw materials, low electrode potential, cheap, non-toxic and stable, and have been developed rapidly. The current commercial lithium-ion batteries still mainly use graphite-based carbon anode materials. However, the theoretical specific capacity of graphite is only 372mAh / g, and the potential platform of lithium intercalation is close to that of metal lithium. Rapid charging or low-temperature charging is prone to "...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/36
CPCY02E60/10
Inventor 符冬菊陈建军李冬霜檀满林张维丽马清
Owner RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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