Multi-layer graphene carbon nanotube three-dimensional carbon material-filled nanometer silicon composite material and preparation method thereof

A technology of multi-layer graphene and multi-wall carbon nanotubes, which is applied in the field of materials, can solve the problems of electrochemical performance attenuation, large volume change, active material shedding, etc., and achieves improved transfer speed, improved rate performance, and simple preparation method Effect

Active Publication Date: 2017-02-15
浙江波仕科技有限公司
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Problems solved by technology

At present, the main problem of silicon as the negative electrode is that the volume changes greatly during the charging and discharging process, which easily leads to the attenuation of electrochemical performance, the active material is easy to fall off from the conductive network, and causes cracks and pulverization of silicon particles, which seriously affects the performance of silicon-based materials. Electrochemical properties

Method used

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  • Multi-layer graphene carbon nanotube three-dimensional carbon material-filled nanometer silicon composite material and preparation method thereof
  • Multi-layer graphene carbon nanotube three-dimensional carbon material-filled nanometer silicon composite material and preparation method thereof
  • Multi-layer graphene carbon nanotube three-dimensional carbon material-filled nanometer silicon composite material and preparation method thereof

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preparation example Construction

[0041] see figure 1 , which is a flow chart showing the steps of the preparation method of the multilayer graphene-multi-walled carbon nanotube three-dimensional carbon material filled nano-silicon composite material according to the embodiment of the present invention, which includes the following steps:

[0042] S10, adding nano-silicon into the ethanol solution, and ultrasonicating to prepare a nano-silicon ethanol solution. Specifically, the ratio of the mass of nano-silicon to the volume of ethanol solvent is 0.1-2.0 mg / mL, and the ultrasound is performed for 0.5-2 hours.

[0043]S20, preparing multi-layer graphene-multi-wall carbon nanotube three-dimensional carbon material. Specifically, S201, measure DMF and distilled water with a volume ratio of 8:2-9:1, mix them as a mixed solvent, and use the volume of the two as a mixed solvent for calculation; S202, add expanded graphite, and ultrasonically vibrate for 2- After 7 hours, multi-layer graphene is obtained, the numb...

Embodiment 1

[0050] The preparation method of the multilayer graphene-multi-walled carbon nanotube three-dimensional carbon material filled nano-silicon composite material according to the embodiment of the present invention comprises the following steps:

[0051] S10, adding nano-silicon into the ethanol solution, and ultrasonicating to prepare a nano-silicon ethanol solution. Specifically, the mass of nano-silicon is 2 mg, the volume of the ethanol solution is 10 mL, the ratio of the mass of nano-silicon to the volume of the ethanol solvent is 0.2 mg / mL, and ultrasound is performed for 1 h.

[0052] S20, preparing multi-layer graphene-multi-wall carbon nanotube three-dimensional carbon material. Specifically, S201, measure DMF and distilled water with a volume ratio of 8:2, mix them as a mixed solvent, and the volume of the two and the volume of the mixed solvent are used for calculation; S202, add 20 mg of expanded graphite, and ultrasonically oscillate for 3 hours to obtain more layer...

Embodiment 2

[0058] The preparation method of the multilayer graphene-multi-walled carbon nanotube three-dimensional carbon material filled nano-silicon composite material according to the embodiment of the present invention comprises the following steps:

[0059] S10, adding nano-silicon into the ethanol solution, and ultrasonicating to prepare a nano-silicon ethanol solution. Specifically, the mass of nano-silicon is 3.3 mg, the volume of ethanol solution is 10 mL, the ratio of the mass of nano-silicon to the volume of ethanol solvent is 0.33 mg / mL, and the ultrasound is performed for 0.8 h.

[0060] S20, preparing multi-layer graphene-multi-wall carbon nanotube three-dimensional carbon material. Specifically, S201, measure DMF and distilled water with a volume ratio of 8.5:1.5, mix them as a mixed solvent, and the volume of the two and the volume of the mixed solvent are used for calculation; S202, add 15 mg of expanded graphite, and ultrasonically vibrate for 2 hours to obtain more la...

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Abstract

The invention belongs to a material technique, and particularly relates to a multi-layer graphene carbon nanotube three-dimensional carbon material-filled nanometer silicon composite material and a preparation method thereof. The preparation method comprises the following steps of preparing a nanometer silicon ethanol solution; preparing a multi-layer graphene-multi-wall carbon nanotube three-dimensional carbon material; mechanically stirring, thus uniformly mixing nanometer silicon and the multi-layer graphene-multi-wall carbon nanotube three-dimensional carbon material, and enabling one part of the nanometer silicon to enter nanometer holes of the multi-layer graphene-multi-wall carbon nanotube three-dimensional carbon material; centrifuging, spattering the nanometer silicon into the nanometer holes of the multi-layer graphene-multi-wall carbon nanotube three-dimensional carbon material, and generating a multi-layer graphene-multi-wall carbon nanotube three-dimensional carbon material-filled nanometer silicon composite material; magnetically separating the multi-layer graphene-multi-wall carbon nanotube three-dimensional carbon material from the excessive nanometer silicon ethanol solution. The prepared multi-layer graphene carbon nanotube three-dimensional carbon material-filled nanometer silicon composite material has good application value on electrode materials and energy-storage materials.

Description

technical field [0001] The invention belongs to material technology, and in particular relates to a multilayer graphene nanocarbon tube three-dimensional carbon material filled nano-silicon composite material and a preparation method thereof. The composite material has good use value in electrode materials and energy storage materials. Background technique [0002] Commercially produced lithium-ion battery anode materials mainly include natural graphite, artificial graphite, hard carbon and soft carbon, etc., but their capacity needs to be further improved. Recently, because silicon material has a theoretical lithium storage capacity of 4200mAh / g, it has become a research hotspot. Further research on it is expected to become the next generation of high-capacity, long-cycle lithium-ion battery anode materials. At present, the main problem of silicon as the negative electrode is that the volume changes greatly during the charging and discharging process, which easily leads to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/364H01M10/0525Y02E60/10
Inventor 徐军明张森胡晓萍周林志李强李从文
Owner 浙江波仕科技有限公司
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