Preparation method and application of asphalt-based nano carbon sheet

A nano-carbon and pitch-based technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of lack of sodium storage space and active sites, poor rate performance, and poor electrical conductivity of pitch-based carbon and other problems, to achieve the effect of simple synthesis process, improved rate performance, and low price

Active Publication Date: 2021-08-06
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of poor electrical conductivity of pitch-based carbon, lack of sufficient sodium storage space and active sites, and poor rate performance, the present invention provides a preparation method of pitch-based nano-carbon sheets, using pitch as the carbon source and phosphate as the structure guide One-step carbonization to obtain pitch-based carbon nanosheets with nanosheet structure doped with phosphorus, and nanocarbon sheets with different thicknesses can be obtained by adjusting the type and amount of structure-directing agent, as well as carbonization temperature and time

Method used

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  • Preparation method and application of asphalt-based nano carbon sheet
  • Preparation method and application of asphalt-based nano carbon sheet
  • Preparation method and application of asphalt-based nano carbon sheet

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Experimental program
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Embodiment 1

[0033] (1) Preparation of 80nm pitch carbon nanosheets: Dissolve 2g of pitch in 20mL of dichloromethane, then uniformly disperse and mix with 1.6g of sodium hypophosphite, dry and remove the methylene chloride to obtain a mixture of pitch and sodium hypophosphite; Under an argon atmosphere, put the mixture of asphalt and sodium hypophosphite into a tube furnace for heating. The heating program is 3°C / min to 350°C and stay for 2h; then raise the temperature to 800°C at 5°C / min and stay for 4h After cooling down to room temperature, the pitch carbon was mixed with 1mol / L hydrochloric acid solution at 60°C for 2 hours, then centrifuged, washed, and dried to obtain the pitch nano-carbon sheet sodium ion battery negative electrode material (pitch-based nano-carbon sheet).

[0034] (2) Sodium ion assembly and performance test: Weigh 0.8g of pitch carbon prepared above, 0.1g of super carbon black, and 0.1g of polyvinylidene fluoride, disperse in N-methylpyrrolidone and homogenize, and...

Embodiment 2

[0036] (1) Preparation of 10nm pitch carbon nanosheets: Dissolve 2g of pitch in 40mL of dichloromethane, mix evenly with 10g of sodium hypophosphite, dry and remove the methylene chloride to obtain a mixture of pitch and sodium hypophosphite; Under the atmosphere, put the mixture of asphalt and sodium hypophosphite into a tube furnace to heat, the heating program is 3°C / min to 350°C, and stay for 4h; then raise the temperature to 850°C at 5°C / min, and stay for 8h; After cooling down to room temperature, the pitch carbon was mixed with 1 mol / L hydrochloric acid solution at 60°C for 4 hours, then centrifuged, washed, and dried to obtain the pitch nano-carbon sheet sodium ion battery negative electrode material (pitch-based nano-carbon sheet).

[0037](2) Sodium ion assembly and performance test: Weigh 0.8g of pitch carbon prepared above, 0.1g of super carbon black, and 0.1g of polyvinylidene fluoride, disperse in N-methylpyrrolidone and homogenize, and apply the slurry evenly on ...

Embodiment 3

[0039] (1) Preparation of large current-adapted pitch carbon nanosheets: Dissolve 2 g of pitch in 80 mL of carbon tetrachloride, mix evenly with 12 g of disodium hydrogen phosphate, dry and remove methylene chloride, and obtain a mixture of pitch and disodium hydrogen phosphate Mixture; under argon atmosphere, put the mixture of asphalt and disodium hydrogen phosphate into a tube furnace to heat, the heating program is 3°C / min to 350°C, stay for 4h; then heat up to 900°C at 5°C / min , stay for 8h; after cooling down to room temperature, mix and stir pitch carbon with 1mol / L hydrochloric acid solution at 60°C for 4h, then centrifuge, wash, and dry to obtain pitch nano-carbon sheet sodium ion battery negative electrode material (pitch-based nano-carbon piece).

[0040] (2) Sodium ion assembly and performance test: Weigh 0.8g of pitch nano-carbon sheets prepared above, 0.1g of super carbon black, and 0.1g of polyvinylidene fluoride, and disperse them in N-methylpyrrolidone for hom...

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Abstract

The invention discloses a preparation method and application of an asphalt-based nano carbon sheet, which belong to the technical field of carbon material synthesis. According to the preparation method, asphalt is taken as a carbon source, phosphate is taken as a structure-directing agent, one-step carbonization is carried out to obtain the asphalt-based nano carbon sheet which is doped with a phosphorus element and has a nano lamellar structure, and the nano carbon sheets with different thicknesses are obtained by regulating and controlling the type and dosage of the structure-directing agent and the carbonization time and temperature. When the nano carbon sheet is applied to the negative electrode of the sodium ion battery, the phosphorus atom-doped nano lamellar structure improves the conductivity and the ion diffusion rate, ensures excellent cycle performance and rate performance, still keeps relatively high specific capacity and cycle stability even under high current density, and when the current density is 20A g<-1>, the specific capacity still can reach 100mAh g<-1> after 10000 cycles. In addition, the synthesis process is simple, controllable, safe and environment-friendly, and has large-scale production potential.

Description

technical field [0001] The invention belongs to the technical field of carbon material preparation, and in particular relates to a preparation method and application of a nano-carbon sheet with pitch as a precursor. Background technique [0002] Developing high-performance and low-cost energy storage systems is a key point to store renewable energy and reduce dependence on fossil fuels. In recent years, lithium-ion batteries have been developed on a large scale and used in portable electronic devices and electric vehicles. However, the global reserves of lithium resources are limited and unevenly distributed. Therefore, developing a substitute for lithium-ion batteries has become a current hot spot. Based on the similar alkali metal chemistry to lithium and the sustainability advantages brought about by the high abundance, low cost, and appropriate redox potential of sodium resources, sodium-ion batteries are expected to be a substitute for lithium-ion batteries. In recent ...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M4/62H01M10/054B82Y30/00B82Y40/00
CPCH01M4/587H01M4/62H01M10/054B82Y30/00B82Y40/00H01M2004/027Y02E60/10
Inventor 孙蔷孙伟
Owner NORTHEASTERN UNIV
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