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Three-dimensional graphene nanoribbon/carbon nanoribbon bridged structural material, and preparation method and application thereof

A technology of graphene nanobelts and carbon nanotubes, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of reduced lithium storage space in batteries, poor stability of lithium batteries, and easy structure of GNRs. collapse and other problems, to achieve the effect of enhanced lithium storage capacity, good electrical conductivity and mechanical properties, sufficient electron transport and mass transfer

Inactive Publication Date: 2015-08-26
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in the process of cyclic lithium deintercalation, the GNRs structure is easy to collapse, resulting in a reduction in the lithium storage space of the battery, which is manifested as poor stability of the lithium battery.

Method used

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  • Three-dimensional graphene nanoribbon/carbon nanoribbon bridged structural material, and preparation method and application thereof
  • Three-dimensional graphene nanoribbon/carbon nanoribbon bridged structural material, and preparation method and application thereof
  • Three-dimensional graphene nanoribbon/carbon nanoribbon bridged structural material, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] (1) Take 10 mL of 0.5 mg / mL carboxylated carbon nanotube solution, add 100 uL of pyrrole as a N source, and disperse ultrasonically until a uniform suspension is formed1.

[0049] (2) The suspension 1 was sealed in a 15 mL hydrothermal reactor, and placed in an oven at 180 °C for 12 h to obtain a block-shaped carbon nanotube hydrogel.

[0050] (3) Put the pre-obtained carbon nanotube hydrogel in 2 M KNO 3 Solvent replacement was carried out in the solution for 24 h. After the replacement was complete, the hydrogel was taken out and sealed in a 15 mL hydrothermal reactor, and then placed in an oven at 180 °C for 48 h to obtain the GNRsCNT hydrogel.

[0051] (4) Replace the obtained hydrogel in 1L of water to wash away the residual impurities (KNO 3 And its reaction by-products), pour out the distilled water after 10h of replacement, repeat 6-8 times. Then, the washed hydrogel was replaced in 500 mL of tert-butanol, and the tert-butanol was poured out after 10 hours of ...

Embodiment 2

[0054] (1) Take 15 mL of 10 mg / mL carboxylated carbon nanotube solution, add 1 mL of thiophene as S source, and ultrasonically disperse until a uniform suspension is formed.

[0055] (2) The suspension 2 was sealed in a 20 mL hydrothermal reactor, and placed in an oven at 200 °C for 6 h to obtain a block-shaped carbon nanotube hydrogel.

[0056] (3) Put the pre-obtained carbon nanotube hydrogel in 1 M K 2 SO 4 The solvent was replaced in the solution for 48 h. After the replacement was complete, the hydrogel was taken out and sealed in a 20 mL hydrothermal reactor, and then placed in an oven at 180 °C for 36 h to obtain the GNRsCNT hydrogel.

[0057] (4) Replace the obtained hydrogel in 1 L of distilled water to wash away the residual impurities (K 2 SO 4 and its reaction by-products), pour out the distilled water after replacement for 10 h, repeat 6-8 times. Add acetone to the hydrogel, pour out the acetone after soaking for 10 h, and repeat 4 times to obtain a ketone gel...

Embodiment 3

[0060] (1) Take 30 mL of 15 mg / mL carboxylated carbon nanotube solution, add 3 mL of pyrrole and 3 mL of thiophene as N and S sources, and disperse ultrasonically until a uniform suspension is formed3.

[0061] (2) The suspension 3 was sealed in a 50 mL hydrothermal reactor, and placed in an oven at 140 °C for 24 h to obtain a block-shaped carbon nanotube hydrogel.

[0062] (3) Put the pre-obtained carbon nanotube hydrogel in 1 M KNO 3 Solvent exchange was carried out in the solution for 48 h. After the replacement was complete, the hydrogel was taken out and sealed in a 50 mL hydrothermal reactor, and then placed in an oven at 180 °C for 60 h to obtain the GNRsCNT hydrogel.

[0063] (4) Replace the obtained hydrogel in 1L of water to wash away the residual impurities (KNO 3 And its reaction by-products), pour out the distilled water after 10h of replacement, repeat 6-8 times. Then add ethanol to the hydrogel, pour out the ethanol after soaking for 5 h, repeat 4 times, add ...

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Abstract

The invention belongs to the technical field of nanometer materials, and specifically relates to a three-dimensional graphene nanoribbon / carbon nanoribbon bridged aerogel material, a preparation method and application thereof. According to the invention, aerogel is prepared by assembling basic structural units formed by bridging the graphene nanoribbon stripped from the carbon nanoribbon with unstripped carbon nanoribbon and doping the basic structural units with heteroatom as needed. The preparation of the aerogel comprises the following steps: preparing a carboxylic carbon nanotube solution, wherein a proper amount of a soluble dopant is added or not added into the solution; then carrying out hydrothermal treatment so as to obtain uniform hydrogel, placing the hydrogel in an ionic impregnation agent for complete replacement, then carrying out secondary hydrothermal treatment so as to finish a stripping process; and finally, carrying out drying and carbonizing so as to obtain the graphene nanoribbon / carbon nanoribbon bridged structural aerogel. The aerogel can be used as an anode material of lithium ion battery, shows high specific capacity and excellent stability and rate performance, and has important research significance and good application prospects.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to an airgel material with a three-dimensional graphene nanobelt / carbon nanotube bridge structure, a preparation method and an application thereof. Background technique [0002] With the widespread application of various electric vehicles, mobile phones, and power banks, rechargeable batteries with high specific capacity and cycle stability have attracted worldwide attention. In order to meet people's increasing demand for energy, countries all over the world are working hard to develop high-performance lithium-ion batteries with high specific capacity, excellent rate performance and long-term stability. The traditional commercial lithium-ion battery anode material is commercial graphite, however due to its low theoretical specific capacity (372 mAh g -1 ) and limited rate capability greatly limit its practical application. Therefore, it is extremely urgent to fi...

Claims

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Application Information

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IPC IPC(8): C01B31/02B82Y30/00
Inventor 易涛陈亮
Owner FUDAN UNIV
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