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Exotic atom-doped porous carbon material and preparation method and application thereof

A technology of porous carbon materials and heteroatoms, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of low doping atomic percentage, complex structure design strategy, and difficult control of doping content, so as to improve storage capacity and product Good structural consistency and improved cycle stability

Active Publication Date: 2019-08-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still problems such as complex structure design strategies, low doping atomic percentage, and difficulty in controlling doping content.

Method used

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  • Exotic atom-doped porous carbon material and preparation method and application thereof
  • Exotic atom-doped porous carbon material and preparation method and application thereof
  • Exotic atom-doped porous carbon material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Solution A: Add 0.1 g of polyacrylonitrile with a molecular weight of 150,000 to 3 mL of DMF solution, and stir until the solution is uniform in a water bath at 50°C;

[0061] Solution C: Prepare 30mL of a mixed solution of glycerol and isopropanol at a ratio of 1:10 (V / V), stir and mix evenly;

[0062] Add solution A dropwise to solution C at a rate of 0.5mL / min. After the dropwise addition, continue stirring at a speed of 700rmp for 30min, then transfer to a 50mL reactor, and keep warm at 180°C for 6h. The resulting product was centrifuged and washed several times with ethanol, and then dried at 80°C for 48h. Then the dried product was placed in a tube furnace at a heating rate of 3°C / min to 700°C, kept for 5h, the protective atmosphere was Ar gas, and then cooled naturally to obtain a nitrogen-doped carbon material.

[0063] The obtained sample was analyzed by a Japan Rigaku D / max~2500 type X-ray diffraction analyzer, and the obtained results were as follows figure...

Embodiment 2

[0067] Solution A: Add 0.1 g of polyacrylonitrile with a molecular weight of 150,000 to 3 mL of DMF solution, and stir until the solution is uniform in a water bath at 50°C;

[0068] Solution C: Prepare 30mL of a mixed solution of glycerol and isopropanol at a ratio of 1:10 (V / V), stir and mix evenly;

[0069] Add solution A dropwise to solution C at a rate of 0.5mL / min. After the dropwise addition, continue stirring at a speed of 700rmp for 30min, then transfer to a 50mL reactor, and keep warm at 180°C for 6h. The resulting product was centrifuged and washed several times with ethanol, and then dried at 80°C for 48h. Mix the dried product and sublimed sulfur evenly at a mass ratio of 1:1, then place it in a tube furnace to raise the temperature to 700°C at a rate of 3°C / min, keep it warm for 2h, and use the protective atmosphere as Ar gas, then cool naturally , the nitrogen-sulfur co-doped carbon material can be obtained. Its scanning electron microscope picture is as Fig...

Embodiment 3

[0071] Solution A: Add 0.1 g of polyacrylonitrile with a molecular weight of 150,000 to 3 mL of DMF solution, and stir until the solution is uniform in a water bath at 50°C;

[0072] Solution B: Add 1 mmol of boric acid to solution A, and continue to stir evenly in a water bath;

[0073] Solution C: Prepare 30mL of a mixed solution of glycerol and isopropanol at a ratio of 1:10 (V / V), stir and mix evenly;

[0074] Add solution B dropwise to solution C at a rate of 0.5mL / min. After the dropwise addition, continue stirring at a speed of 700rmp for 30min, then transfer to a 50mL reactor, and keep warm at 180°C for 6h. The resulting product was centrifuged and washed several times with ethanol, and then dried at 80°C for 48h. Mix the dried product and sublimed sulfur evenly at a mass ratio of 1:1, then place it in a tube furnace to raise the temperature to 700°C at a rate of 2°C / min, keep it warm for 5h, and use Ar gas as the protective atmosphere, then cool naturally , the carb...

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Abstract

The invention discloses an exotic atom-doped carbon material and a preparation method and an application thereof. The doped carbon material prepared according to the method is a honeycomb three-dimensional multi-level porous structure material, wherein macropores are constructed by mutually cross-linked flakes, the flakes are stacked by nanoparticles, and random mesopores and micropores are distributed between the nanoparticles. The preparation method comprises the steps of firstly dissolving polyacrylonitrile into an N, N-dimethylformamide solution, then adding one or more reagents containingtarget doping atoms into the solution, conducting a solvothermal reaction to obtain a precursor, placing the precursor in a protective atmosphere for calcination so as to obtain a single or multi-atom doped carbon material with uniform nanometer size and excellent electrochemical performance. Sodium-ion batteries show high specific capacity, excellent rate performance and ultra-long cycle stability when the exotic atom-doped carbon material is used as a negative electrode material of the sodium-ion batteries.

Description

technical field [0001] The invention relates to a heteroatom-doped porous carbon material and its preparation method and application; it belongs to the technical field of preparation of electrode materials for sodium ion batteries. Background technique [0002] In recent years, with the in-depth research on lithium-ion batteries and the rapid growth of demand for various consumer electronics and electric vehicles, the expansion of the industrial scale of lithium-ion batteries has been accelerated. However, the abundance of lithium resources in the earth's crust is very low (0.002%) and the distribution is extremely uneven, which greatly limits the application of lithium-ion batteries in large-scale energy storage. [0003] Compared with lithium, sodium resources have a high abundance (2.36%) in the earth's crust, are widely distributed, and have very similar physical and chemical properties to lithium. When used as a lithium-ion secondary battery, it is also a "rocking chair...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/364H01M4/625Y02E60/10
Inventor 潘安强尹波唐艳
Owner CENT SOUTH UNIV
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