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Porous carbon nanometer tubular material and preparation method and application thereof

A carbon nano, tubular technology, applied in the field of porous carbon nano tubular materials and its preparation, materials with coaxial double-layer hollow tubular structure and its preparation, can solve the problems of poor performance cycle stability, weak sodium storage capacity, layer spacing Incompatibility and other problems, to achieve the effect of low cost, increase the carbon layer spacing, and promote the insertion and extraction process

Active Publication Date: 2017-07-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, although graphite has a high lithium storage capacity, its ability to store sodium is very weak, which is generally believed to be caused by the mismatch between the radius of sodium ions and the spacing between graphite layers.
Amorphous carbon has a low degree of graphitization, and its structure is mainly composed of a large number of disordered carbon crystallites, with a large interlayer spacing and a large number of nanopores, which provide ideal active sites for the storage of sodium ions. , so amorphous carbon materials have high reversible sodium storage capacity, but such materials have poor conductivity, poor performance cycle stability, and fast capacity decay, which greatly limits their application in sodium-ion batteries.

Method used

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  • Porous carbon nanometer tubular material and preparation method and application thereof
  • Porous carbon nanometer tubular material and preparation method and application thereof
  • Porous carbon nanometer tubular material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Stir 20mL of 1.0mol / L nickel nitrate solution, 1% polyethylene glycol and 0.5mL of 1mol / L sodium hydroxide evenly to carry out hydrothermal reaction. The holding temperature is 160°C and the holding time is 24h. Then, it was washed with deionized water for 3 times, and then with absolute ethanol for 2 times, and then dried in a vacuum oven at 60° C. for 10 hours to obtain transition metal nanowires. Add 0.08g of transition metal nanowires, 8.8g of dopamine, and 1g of CTAB into 1L of water, stir evenly, place in a reactor for hydrothermal reaction, the reaction temperature is 180°C, and the reaction time is 16h. After suction filtration, washing and drying, carbon-transition Metal nanowire precursors. The precursor was carbonized under nitrogen atmosphere, the carbonization temperature was 900°C, the carbonization time was 2h, and the heating rate was 2°C / min. Subsequently, the high-temperature carbonized product was repeatedly washed with dilute acid solution and water...

Embodiment 2

[0049] Stir 20mL of 1.5mol / L nickel sulfate solution, 1% polyethylene glycol and 0.5mL of 1mol / L sodium hydroxide evenly, and carry out hydrothermal reaction. The holding temperature is 180°C and the holding time is 24h. Then, it was washed with deionized water for 3 times, and then with absolute ethanol for 2 times, and then dried in a vacuum oven at 60° C. for 10 hours to obtain transition metal nanowires. Add 0.08g of transition metal nanowires, 9.6g of dopamine, and 1g of sodium dodecylbenzenesulfonate into 1L of water, place in a reaction kettle for hydrothermal reaction, the reaction temperature is 190°C, and the reaction time is 24h. After suction filtration, washing and drying, A carbon-transition metal nanowire precursor is obtained. The precursor was carbonized under nitrogen atmosphere, the carbonization temperature was 1000°C, the carbonization time was 4h, and the heating rate was 2°C / min. Subsequently, the high-temperature carbonized product was repeatedly washe...

Embodiment 3

[0052] Stir 20mL of 2mol / L nickel chloride solution, 1% polyethylene glycol and 0.5mL of 1mol / L sodium hydroxide evenly to carry out hydrothermal reaction. The holding temperature is 200°C and the holding time is 24h. Then, it was washed with deionized water for 3 times, and then with absolute ethanol for 2 times, and then dried in a vacuum oven at 60° C. for 10 hours to obtain transition metal nanowires. Add 0.08g of transition metal nanowires, 10.4g of dopamine, and 1g of sodium stearate into 1L of water, place in a reactor for hydrothermal reaction, the reaction temperature is 200°C, and the reaction time is 24h. After suction filtration, washing and drying, carbon-transition Metal nanowire precursors. The precursor was carbonized under nitrogen atmosphere at 1100°C, the carbonization time was 4h, and the heating rate was 2°C / min. Subsequently, the high-temperature carbonized product was repeatedly washed with dilute acid solution and water, then placed at 70° C., and vacu...

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Abstract

The invention discloses a dual-layer porous carbon nanometer tubular material and a preparation method and application thereof. The material has a coaxial dual-layer hollow tubular structure, wherein a carbon material taking high graphitized carbon as main is arranged at an inner layer, and a carbon material taking amorphous carbon as main is arranged at an outer layer. The preparation method comprises the steps of preparing a transition metal nanowire by a hydrothermal method, coating an organic carbon source on a surface of the transition metal nanowire to obtain a precursor by a liquid phase deposition method, and carbonizing and pickling the precursor to obtain the material. The method has the advantages of available raw material, simple preparation process and good repeatability, and the prepared material has relatively large inter-layer distance, rich porous structure, large specific area and favorable conductivity, shows high cycle efficiency, high specific capacity and rate performance when applied to a sodium ion battery, and has wide industrial application prospect.

Description

technical field [0001] The invention relates to a porous carbon nanotube material and a preparation method thereof, in particular to a material having a coaxial double-layer hollow tubular structure composed of a high-graphitization and low-graphitization double-layer carbon material and a preparation method thereof and as a The invention relates to the application of a carbon negative electrode material for a sodium ion battery, belonging to the field of the sodium ion battery. Background technique [0002] With the gradual reduction of traditional energy sources such as coal, oil, and natural gas, and increasingly severe environmental problems, the demand for small separated mobile power supplies has shown an explosive growth trend, and various rechargeable chemical power supplies have received more and more attention. Especially since the advent of lithium-ion batteries in the 1990s, as a new generation of rechargeable batteries, they have attracted much attention due to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/62H01M10/054
CPCH01M4/583H01M4/625H01M10/054Y02E60/10
Inventor 张治安赖延清尹盟陈玉祥尚国志张凯李劼
Owner CENT SOUTH UNIV
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