A kind of preparation method and application of pitch-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: 2022-06-07
NORTHEASTERN UNIV LIAONING
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  • 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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  • A kind of preparation method and application of pitch-based nano carbon sheet
  • A kind of preparation method and application of pitch-based nano carbon sheet
  • A kind of preparation method and application of pitch-based nano carbon sheet

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Embodiment 1

[0033] (1) Preparation of 80nm pitch carbon nanosheets: Dissolve 2g pitch in 20mL dichloromethane, disperse and mix with 1.6g sodium hypophosphite uniformly, dry and remove dichloromethane to obtain a mixture of pitch and sodium hypophosphite; Under an argon atmosphere, the mixture of pitch and sodium hypophosphite was heated in a tube furnace, and the heating program was 3 °C / min to 350 °C and held for 2 h; then heated to 800 °C at 5 °C / min and held for 4 h After being lowered to room temperature, the pitch carbon was mixed with a 1 mol / L hydrochloric acid solution at 60 °C for 2 h, followed by centrifugation, washing and drying 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 apply the slurry even...

Embodiment 2

[0036] (1) Preparation of 10 nm pitch carbon nanosheets: Dissolve 2 g pitch in 40 mL of dichloromethane, mix with 10 g of sodium hypophosphite, dry and remove the dichloromethane to obtain a mixture of pitch and sodium hypophosphite; Under the atmosphere, put the mixture of pitch and sodium hypophosphite into a tube furnace for heating, and the heating program is 3 °C / min to 350 °C, and stay for 4 h; After dropping to room temperature, the pitch carbon was mixed with 1 mol / L hydrochloric acid solution at 60 °C and stirred for 4 h, followed by centrifugation, washing, and drying to obtain the pitch nano-carbon sheet sodium ion battery anode material (pitch-based nano-carbon sheet).

[0037](2) Sodium ion assembly and performance test: Weigh 0.8 g of pitch carbon prepared above, 0.1 g of super carbon black, and 0.1 g of polyvinylidene fluoride, disperse in N-methylpyrrolidone and homogenize, and apply the slurry evenly to the On the copper foil, vacuum-drying at 80 °C for 12 h, ...

Embodiment 3

[0039] (1) Preparation of high-current-adapted pitch carbon nanosheets: Dissolve 2 g pitch in 80 mL of carbon tetrachloride, mix with 12 g of disodium hydrogen phosphate, and dry to remove dichloromethane to obtain a mixture of pitch and disodium hydrogen phosphate. Mixture; under argon atmosphere, put the mixture of pitch and disodium hydrogen phosphate in a tube furnace for heating, the heating program is 3°C / min to 350°C and stay for 4h; then the temperature is raised to 900°C at 5°C / min , and stayed for 8 h; after being lowered to room temperature, the pitch carbon was mixed with a 1 mol / L hydrochloric acid solution at 60 °C and stirred for 4 h, followed by centrifugation, washing and drying to obtain pitch nano carbon sheets as a negative electrode material for sodium ion batteries (pitch-based nano carbon). piece).

[0040] (2) Sodium ion assembly and performance test: Weigh 0.8g of the above-prepared pitch nano-carbon sheets, 0.1g of super carbon black, and 0.1g of poly...

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Abstract

The invention discloses a preparation method of a pitch-based nano-carbon sheet and an application thereof, belonging to the technical field of carbon material synthesis. The present invention uses pitch as a carbon source, phosphate as a structure-directing agent, and one-step carbonization to obtain a pitch-based nano-carbon sheet with a nano-sheet structure doped with phosphorus, and through the type, amount, and carbonization time of the structure-directing agent. Carbon nanosheets with different thicknesses were obtained by controlling the temperature. Applying it to the negative electrode of sodium-ion batteries, the doping of phosphorus atoms and the nanosheet structure improve the conductivity and ion diffusion rate, ensure excellent cycle performance and rate performance, and maintain a high specific capacity even at high current densities and cycle stability at a current density of 20A g ‑1 , after 10,000 cycles, the specific capacity can still reach 100mAh g ‑1 . In addition, the synthetic process of the present invention is simple, controllable, safe and environmentally 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 using pitch as a precursor. Background technique [0002] The development of high-performance and low-cost energy storage systems is a key point for storing renewable energy and reducing reliance 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 lithium resource reserves are limited and unevenly distributed. Therefore, the development of an alternative to lithium-ion batteries has become a hot topic. Na-ion batteries are expected to be an alternative to lithium-ion batteries based on the similar alkali metal chemistry to lithium and the sustainability advantages of high abundance, low cost, and appropriate redox potential of sodium resources. In recent years, based...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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 LIAONING
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