Hollow porous carbon material as well as preparation method and application thereof

A porous carbon material, hollow technology, applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of large sodium ion atomic radius, low product purity, complex synthesis method, etc., to achieve simple and safe synthesis method, simple and easy raw materials high cycle stability

Pending Publication Date: 2022-07-26
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most commonly used commercial anode for lithium-ion batteries today is graphite, but due to its low theoretical specific capacity (372mAh g -1 ), it is difficult to meet the growing energy demand
In addition, the large atomic radius of sodium ions makes it difficult to intercalate into graphite
Graphene has the advantages of two-dimensional conductive network, large specific surface area and porous structure, and is one of the research hotspots of carbon-based materials. However, the disadvantages of complex synthesis methods, high cost, low yield and low product purity limit the large-scale production of graphene. application

Method used

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  • Hollow porous carbon material as well as preparation method and application thereof
  • Hollow porous carbon material as well as preparation method and application thereof
  • Hollow porous carbon material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A hollow carbon nano flower-like material, the preparation method of which comprises the following steps:

[0045] 1) 0.1mol L in a molar ratio of 1:1 -1 Concentration of nickel acetate tetrahydrate (C 4 H 6 NiO 4 ·4H 2 O) and cobalt acetate tetrahydrate (C 4 H 6 CoO 4 ·4H 2 (2) Dissolve in methanol, stir for 1 hour; transfer the well-stirred solution to 100mL polytetrafluoroethylene lining, seal it in a hydrothermal kettle, and perform solvothermal reaction at 180 ° C for 48 hours, and the resulting precipitate will be obtained after the reaction is completed. The product was centrifuged and washed three times with methanol and ethanol, and then vacuum-dried at 60 °C to obtain the precursor nanoflower-like double metal hydroxymethyl hydroxide Ni 0.5 Co 0.5 (OH)(OCH 3 ).

[0046] 2) 10mmol L -1 Tris (Tris) was dissolved in deionized water and stirred for 5 min; 0.1 g Ni was added 0.5 Co 0.5 (OH)(OCH 3 ), ultrasonically dispersed for 20 min to form a homog...

Embodiment 2

[0050] A hollow carbon nano flower-like material, the preparation method of which comprises the following steps:

[0051] 1) Add 0.05mol L in a molar ratio of 1:1 -1 Concentration of nickel acetate tetrahydrate (C 4 H 6 NiO 4 ·4H 2 O) and cobalt acetate tetrahydrate (C 4 H 6 CoO 4 ·4H 2 (2) Dissolve in methanol, stir for 1 hour; transfer the well-stirred solution to 100mL polytetrafluoroethylene lining, seal in a hydrothermal kettle, and perform a solvothermal reaction at 180° C. for 12 hours. After the reaction is completed, the resulting precipitate will be The product was centrifuged and washed three times with methanol and ethanol, and then vacuum-dried at 60 °C to obtain the precursor nanoflower-like double metal hydroxymethyl hydroxide Ni 0.5 Co 0.5 (OH)(OCH 3 ).

[0052] 2) 10mmol L -1 Tris (Tris) was dissolved in deionized water and stirred for 5 min; 0.1 g Ni was added 0.5 Co 0.5 (OH)(OCH 3 ), ultrasonically dispersed for 20 min to form a homogeneous su...

Embodiment 3

[0056] A hollow carbon nano flower-like material, the preparation method of which comprises the following steps:

[0057] 1) 0.2mol L in a molar ratio of 1:1 -1 Concentration of nickel acetate tetrahydrate (C 4 H 6 NiO 4 ·4H 2 O) and cobalt acetate tetrahydrate (C 4 H 6 CoO 4 ·4H 2 (2) Dissolve in methanol, stir for 1 hour; transfer the well-stirred solution to 100mL polytetrafluoroethylene lining, seal it in a hydrothermal kettle, and perform solvothermal reaction at 180°C for 60 hours. After the reaction finishes, the resulting precipitate will be The product was centrifuged and washed three times with methanol and ethanol, and then vacuum-dried at 60 °C to obtain the precursor nanoflower-like double metal hydroxymethyl hydroxide Ni 0.5 Co 0.5 (OH)(OCH 3 ).

[0058] 2) 10mmol L -1 Tris (Tris) was dissolved in deionized water and stirred for 5 min; 0.1 g Ni was added 0.5 Co 0.5 (OH)(OCH 3 ), ultrasonically dispersed for 20 min to form a homogeneous suspension, ...

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PUM

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Abstract

The invention discloses a hollow porous carbon material and a preparation method and application thereof, a nickel-cobalt bimetallic hydroxymethyl hydroxide is used as a skeleton to prepare a negative electrode material with a hollow carbon nanoflower structure, and co-doping of nitrogen, nickel and cobalt in the carbon skeleton is realized. The synthesis method is simple and safe, raw materials are simple and easy to obtain, and synthesis cost is low. The synthesized material has excellent cycling stability and high specific capacity, the specific capacity of 460 mAh.g <-1 > can still be reserved after 1000 cycles under the current density of 1A. G <-1 >, and the capacity retention rate is 92%.

Description

technical field [0001] The invention relates to the field of porous carbon materials, in particular to a hollow porous carbon material and a preparation method and application thereof. Background technique [0002] With the continuous growth of the global population and the continuous improvement of living standards, the average annual energy consumption is getting higher and higher. Traditional fossil energy such as oil, coal and natural gas have the disadvantages of limited reserves and non-renewable, and the greenhouse gases released by their combustion can also cause serious environmental problems. It is urgent to develop reliable green secondary energy as a substitute. [0003] Lithium-ion batteries have the advantages of high energy density, good cycle performance, long storage time, and small self-discharge. They are widely used in 3C electronic products, portable electronic equipment, and electric vehicles. They are the most popular electrical energy storage and conv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/133H01M4/1393H01M10/0525
CPCH01M4/583H01M4/133H01M4/1393H01M10/0525
Inventor 刘芝婷蔡建钟陈逊杰吴泽南郑文芝杨伟范浩森
Owner GUANGZHOU UNIVERSITY
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