Carbon@SiOx/C@carbon nanotube composite material and preparation method thereof

A technology of carbon nanotubes and composite materials, applied in the field of electrochemical energy storage, can solve the problems of material structure pulverization, shedding, volume expansion and low electronic conductivity

Active Publication Date: 2021-04-20
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large expansion/shrinkage of silicon-based anode materials during the cycle, it is easy to cause powdering and shedding

Method used

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  • Carbon@SiOx/C@carbon nanotube composite material and preparation method thereof
  • Carbon@SiOx/C@carbon nanotube composite material and preparation method thereof
  • Carbon@SiOx/C@carbon nanotube composite material and preparation method thereof

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preparation example Construction

[0040] To solve the above problems, combined with figure 1 , Figure 10 As shown, the embodiment of the present invention provides a carbon @SiO x / C@ carbon nanotube composite material preparation method, the specific steps are:

[0041] S1. Disperse the silicon source and carbon nanotube particles in a mixed solvent, add ammonia water, and obtain the organic silicon@carbon nanotube composite material after centrifugal drying;

[0042]S2. Put the organosilicon@carbon nanotube composite material in a tube furnace, conduct primary carbonization in a protective atmosphere, then pass in organic gas for secondary carbonization, and finally cool to room temperature to obtain carbon@SiO x / C@carbon nanotube composite material.

[0043] The silicon source selected in the embodiment of the present invention is hydrolyzed into silanols in ammonia water, and is adsorbed on the negatively charged carbon nanotubes 1 through hydrogen bonding, and the polycondensation reaction between th...

Embodiment 1

[0055] This example provides a carbon @SiO x / C@ carbon nanotube composite material preparation method, the specific steps are as follows:

[0056] 1) Add 1 mL of vinyltrimethoxysilane and 1.5 mL of single-walled carbon nanotube aqueous solution (3 mg / mL) into 150 mL of distilled water, that is, the volume / mass ratio of silicon source to carbon nanotubes is 0.22, and then 25wt.% ammonia solution was added dropwise at a rate of 1 drop, stirred for 12 hours, centrifuged, washed, and dried to obtain the organosilicon@carbon nanotube composite material.

[0057] 2) Carbonize the dried organosilicon@carbon nanotube composite material in a tube furnace under the protection of argon. The carbonization time is 4 hours, and the carbonization temperature is 800°C, followed by acetylene / argon gas. The mixed gas is carbonized for 30 minutes, the carbonization time is 30 minutes, the carbonization temperature is 800°C, and carbon @SiO is obtained after cooling to room temperature x / C@ca...

Embodiment 2

[0071] The difference between this embodiment and embodiment 1 is:

[0072] In step 1), 0.3 mL of vinyltrimethoxysilane and 2.0 mL of single-walled carbon nanotube aqueous solution (3 mg / mL) were added to 200 mL of distilled water, that is, the volume / mass ratio of silicon source to carbon nanotubes was 0.05, Add 0.3wt.% ammonia water dropwise at a rate of 5 seconds / drop;

[0073] In step 2), the primary carbonization time is 5 hours, and the carbonization temperature is 800°C;

[0074] Other parameters are the same as in Example 1.

[0075] Figure 8 Carbon@SiO prepared for Example 2 x The SEM image of / C@carbon nanotube composite material, wherein, a) is the 100nm scale figure, b) is the 50nm scale figure, from Figure 8 It can be seen that the carbon@SiO prepared in Example 2 x The morphology of / C@carbon nanotube composites maintains the one-dimensional continuous linear structure of carbon nanotubes, and the shell layer and carbon nanotubes grow on carbon nanotubes c...

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Abstract

The invention provides a carbon@SiOx/C@carbon nanotube composite material and a preparation method thereof. The preparation method comprises the specific steps: S1, dispersing a silicon source and carbon nanotubes in a mixed solvent, adding ammonia water, and obtaining an organic silicon@carbon nanotube composite material after centrifugal drying; and S2, putting the organic silicon@carbon nanotube composite material into a tubular furnace, carrying out primary carbonization in a protective atmosphere, then introducing organic gas for secondary carbonization, and finally cooling to room temperature, so as to obtain the carbon@SiOx/C@carbon nanotube composite material. Organic silicon grows on the carbon nanotubes in situ by a sol-gel method, the prepared carbon@SiOx/C@carbon nanotube composite material comprises internal carbon nanotubes, an external carbon shell and a small-particle SiOx/C layer clamped between the carbon shell and the carbon nanotubes after two times of high-temperature carbonization, the three layers of structures have a synergistic effect, the volume expansion of the composite material is reduced, and the electronic conductivity is improved.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage, in particular to a carbon@SiO x / C@carbon nanotube composite material and its preparation method. Background technique [0002] New devices such as portable electronics and electric vehicles place significant demands on high-energy-density lithium-ion battery technology capable of rapid charging. However, most lithium-ion batteries currently use graphite materials as negative electrodes, and the theoretical specific capacity of graphite negative electrodes is only 372mAh g -1 , severely restricting the development of lithium-ion batteries. In contrast, the theoretical specific capacity of silicon Si anode is as high as 4200mAh g -1 , and the potential of deintercalating lithium is equivalent to that of graphite. In the development process of high-energy and high-power-density batteries, Si-based negative electrodes are one of the best materials to replace graphite negati...

Claims

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Application Information

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IPC IPC(8): C01B32/168C01B33/113C01B32/05H01M4/36H01M4/48H01M4/62H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 周亮张媛媛沙玉静麦立强
Owner WUHAN UNIV OF TECH
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