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A method for preparing nitrogen-doped graphitized carbon

A technology of graphitized carbon and nitrogen doping, which is applied in the manufacture of hybrid/electric double layer capacitors, structural parts, electrical components, etc., and can solve problems such as complex and cumbersome processes, poor graphite rate performance, and low graphitization degree of graphitized carbon , to achieve the effect of shortening the experimental process, improving the degree of graphitization, and good catalytic effect

Active Publication Date: 2020-01-21
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Researchers have proposed that graphitized carbon be applied to lithium-ion batteries and lithium-ion capacitor anode materials, which can alleviate the problem of poor graphite rate performance to a certain extent. However, the current preparation of graphitized carbon is mainly to physically mix carbon precursors and metal ions. Then high-temperature sintering preparation, the process is more complicated and cumbersome, and the degree of graphitization of the obtained graphitized carbon is not high, and there are many defects

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  • A method for preparing nitrogen-doped graphitized carbon
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  • A method for preparing nitrogen-doped graphitized carbon

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Embodiment 1

[0036] A preparation method of nitrogen-doped graphitized carbon, comprising the following steps:

[0037] (1) Mix ferric ammonium citrate and urea in a ratio of 1:3, add 100ml of deionized water to dissolve, transfer to the reaction kettle and heat at 180°C for 6 hours, and evaporate the solvent in the product of the hydrothermal reaction to obtain the reaction Precursor;

[0038] (2) Sinter the precursor at 1300°C to obtain a carbon material containing metal element and metal carbide, wash with 0.5 mol / L hydrochloric acid to remove the metal element and metal carbide, wash with water until neutral vacuum drying to obtain nitrogen doping graphitized carbon materials.

[0039] pass image 3 and Figure 4 The comparison shows that the (002) peak of the graphitized carbon material graphite prepared by the present invention is sharp and strong, and has a higher graphitization tendency. According to the specific surface area test and pore size distribution test, the specific s...

Embodiment 2

[0041] A method for preparing a silicon-carbon composite negative electrode material, comprising the following steps:

[0042] (1) Mix ferric citrate and urea in a ratio of 1:3, add 100ml of deionized water to dissolve, transfer to the reaction kettle and heat at 180°C for 6 hours, and evaporate the solvent in the product of the hydrothermal reaction to obtain the reaction precursor body;

[0043] (2) Sinter the precursor at 1300°C to obtain a carbon material containing metal element and metal carbide, wash with 0.5 mol / L hydrochloric acid to remove the metal element and metal carbide, wash with water until neutral vacuum drying to obtain nitrogen doping graphitized carbon materials.

[0044] The obtained materials were assembled into button batteries, and the charge and discharge performance tests were carried out. The results show that the graphitized carbon prepared by this method can achieve 340.2 mAh / g as an anode material for lithium-ion batteries, and has excellent cy...

Embodiment 3

[0046] A method for preparing a silicon-carbon composite negative electrode material, comprising the following steps:

[0047](1) Mix nickel citrate and urea in a ratio of 1:3, add 100ml of deionized water to dissolve, transfer to the reaction kettle and heat at 180°C for 6 hours, and evaporate the solvent in the product of the hydrothermal reaction to obtain the reaction precursor body;

[0048] (2) Sinter the precursor at 1300°C to obtain a carbon material containing metal element and metal carbide, wash with 0.5 mol / L hydrochloric acid to remove the metal element and metal carbide, wash with water until neutral vacuum drying to obtain nitrogen doping graphitized carbon materials.

[0049] The obtained materials were assembled into button batteries, and the charge and discharge performance tests were carried out. The results show that the graphitized carbon prepared by this method can achieve 334.2 mAh / g as an anode material for lithium-ion batteries, and has excellent cyc...

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Abstract

The invention provides a method for preparing nitrogen-doped graphitized carbon. Metal ions are introduced into a nitrogen-doped carbon material body, after a mixture is subjected to high-temperaturethermal treatment, then the metal ions are removed, and the nitrogen-doped graphitized carbon material is obtained. The method for preparing nitrogen-doped graphitized carbon is simple, the particle size is small, graphitized carbon prepared by the method is used as a lithium ion battery cathode material, the specific capacity of 354.6 mAh / g can be achieved, the circulation performance is excellent, and after 100-time circulation, the capacity retention ratio is stabilized at 99%.

Description

technical field [0001] The invention relates to a method for preparing nitrogen-doped graphitized carbon by a one-step hydrothermal method, which belongs to the field of lithium ion battery negative electrode materials and lithium ion capacitor negative electrode materials. Background technique [0002] Commercial lithium-ion batteries are widely used in consumer electronics, new energy vehicles and portable electronic devices. With the development of science and the progress of society, people have higher and higher demands on the energy density and power density of lithium-ion batteries. At present, the anode material of commercial lithium-ion batteries is mainly graphite anode, however, its low theoretical specific capacity (~372mAh g -1 ) and poor rate performance limit the improvement of the energy density and power density of lithium-ion batteries, and the development of new negative electrode materials and new energy storage devices is imminent. [0003] Lithium-ion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/34H01G11/50H01G11/86H01M4/583
CPCH01G11/34H01G11/50H01G11/86H01M4/583Y02E60/10
Inventor 尹周澜李广超郭华军李新海王志兴彭伟佳王接喜彭文杰胡启阳
Owner CENT SOUTH UNIV
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