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Sulfur-doped two-dimensional carbon material, preparation method and application thereof

A two-dimensional carbon material, sulfur-doped technology, applied in the direction of secondary batteries, active material electrodes, electrical components, etc., can solve the problems of unfavorable ion diffusion, low capacity, poor rate performance, etc., to achieve high sulfur doping, The effect of large specific surface area and high capacity

Active Publication Date: 2018-08-21
WUHAN UNIV OF SCI & TECH
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Problems solved by technology

[0004] At present, some sulfur-doped carbon materials need to provide additional sulfur sources, such as elemental sulfur, hydrogen sulfide or some sulfur-containing organic compounds; secondly, there are currently organic compounds that are both carbon sources and sulfur sources directly carbonized into sulfur-doped carbon materials. However, most of these materials are micron-scale bulk materials. When used as anode materials for sodium-ion batteries, it is not conducive to the diffusion of ions in the materials, which makes the materials have low capacity during high-current charge and discharge, that is, poor rate performance.

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  • Sulfur-doped two-dimensional carbon material, preparation method and application thereof
  • Sulfur-doped two-dimensional carbon material, preparation method and application thereof

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[0047] In the preparation process of the in-situ sulfur-doped two-dimensional carbon material of the present invention, after the precursor organic matter containing sulfur source and carbon source enters the interlayer structure of the hydrotalcite template in the form of anion, it needs to be pre-carbonized first, that is, the organic matter in the layer Preliminary carbonization is carried out under the fixation of the template, and then the template is removed. After the template is removed, the second carbonization must be carried out. In the experiment, the sulfur-doped carbon material after pre-carbonization and removal of the template was used as the anode material of the sodium-ion battery. It was found that the performance was very poor, which may be due to the presence of the template affecting the crystallization properties of the material during the carbonization process, which eventually led to a negative electrode material when used as a battery material. Perform...

Embodiment 1

[0051] (1) Basic magnesium carbonate and sodium metaaluminate were mixed with water (the molar ratio of Mg and Al was 2:1), stirred for 12 hours, washed with deionized water, dried in an oven at 60°C to obtain a hydrotalcite template.

[0052] (2) Prepare 50mg / mL sodium p-styrene sulfonate solution and place it in a three-necked flask, and continuously feed N 2 , stirred for 12h and set aside.

[0053] (3) Heat the hydrotalcite template to 475°C in an Ar atmosphere, keep it warm for 3 hours, and then quickly import it into the three-necked bottle in (2) after cooling to room temperature with the furnace. After stirring at 80° C. for 12 h, wash with deionized water, filter with suction, and dry the solid in an oven.

[0054] (4) Disperse the product obtained in (3) in 200mL 0.1mol / L K 2 S 2 o 8 In the aqueous solution, heat in a water bath at 80°C, stir for 1 hour, rinse with deionized water, and dry in an oven.

[0055] (5) Put the product of (4) in an alumina crucible, h...

Embodiment 2

[0066] (1) Basic magnesium carbonate and sodium metaaluminate were mixed with water (the molar ratio of Mg and Al was 2:1), stirred for 12 hours, washed with deionized water repeatedly, and dried in an oven at 60°C to obtain a hydrotalcite template.

[0067] (2) Prepare 50mg / mL sodium p-styrene sulfonate solution and place it in a three-necked flask, and continuously feed N 2 , stirred for 12h and set aside.

[0068] (3) Heat the hydrotalcite template to 475° C. in an Ar atmosphere, keep it warm for 3 hours, and quickly import it into the three-necked bottle in step (2) after cooling to room temperature. After stirring at 80° C. for 12 h, it was washed with deionized water and dried in an oven.

[0069] (4) Disperse the product obtained in (3) in 200mL 0.1mol / L K 2 S 2 o 8 In the aqueous solution, heat in a water bath at 80°C, stir for 1 hour, rinse with deionized water, and dry in an oven.

[0070] (5) Put the product of (4) in an alumina crucible, heat it up to 600°C at...

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Abstract

Belonging to the technical field of inorganic material preparation, the invention in particular relates to a sulfur-doped two-dimensional carbon material, a preparation method and application thereof,and more specifically relates to a method for preparation of an in-situ sulfur-doped two-dimensional carbon material with hydrotalcite as the template to serve as a sodium-ion battery negative electrode, a product and application. According to the invention, hydrotalcite is adopted as the template, a sulfonate of an unsaturated organic matter is taken as the precursor, and intercalation of the precursor, oxidation polymerization of the precursor, carbonization fixation of the precursor, template removal and recarbonization are carried out in order to realize preparation of the in-situ sulfur-doped two-dimensional carbon material. The preparation process is simple and feasible, the sulfur doping content is high, and the method can achieve large-scale production.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic materials, in particular, relates to a sulfur-doped two-dimensional carbon material, its preparation method and application, more specifically, relates to an in-situ sulfur-doped two-dimensional carbon prepared by using hydrotalcite as a template Methods, products, and applications of materials as anodes for sodium-ion batteries. Background technique [0002] In recent years, lithium-ion batteries have been widely used in electronic products such as mobile phones and notebook computers due to their advantages such as large specific capacity, high discharge voltage, good stability, safe use and long life. But now demand for lithium is growing due to rapidly growing demand for electronic devices and electric vehicles. The content of lithium in the earth's crust is only 0.0065%, and its abundance ranks 27th, and it is concentrated in a few areas. Considering the demand for large-sc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/054
CPCH01M4/583H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 高标郭炜源霍开富丁康付继江张旭明
Owner WUHAN UNIV OF SCI & TECH
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