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Silicon-nitrogen doped carbon-nitrogen doped graphene composite material, and preparation method and application thereof

A technology of nitrogen-doped graphene and nitrogen-doped carbon, applied in electrical components, electrochemical generators, battery electrodes, etc., to achieve excellent electrochemical performance, suppress volume change, and improve electrochemical performance

Inactive Publication Date: 2015-06-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no public report on the composite lithium-ion battery anode material with silicon-nitrogen doped carbon with core-shell structure and wrapped in nitrogen-doped graphene at the same time.

Method used

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  • Silicon-nitrogen doped carbon-nitrogen doped graphene composite material, and preparation method and application thereof
  • Silicon-nitrogen doped carbon-nitrogen doped graphene composite material, and preparation method and application thereof
  • Silicon-nitrogen doped carbon-nitrogen doped graphene composite material, and preparation method and application thereof

Examples

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Embodiment 1

[0028] Embodiment 1, silicon-nitrogen-doped carbon-nitrogen-doped graphene composite material, wherein the mass ratio of graphene oxide: nitrogen-containing carbon source: silicon is 1:2:3, and its preparation steps are as follows:

[0029] 1) Disperse 0.3g of silicon powder in 100mL of water and ultrasonically treat it for 1 hour to obtain an aqueous dispersion of silicon;

[0030] 2) Dissolve 0.2g of glucosamine in 20mL of water to obtain a glucosamine solution;

[0031] 3) Add the glucosamine solution to the aqueous silicon dispersion, stir at room temperature for 6 hours, and ultrasonically for 30 minutes to obtain a mixed solution A for use;

[0032] 4) Prepare a graphene oxide aqueous dispersion with a concentration of 1 mg / mL with deionized water, take 100 mL of graphene oxide aqueous dispersion for ultrasonic dispersion for 1 hour, and add the graphene oxide aqueous dispersion to the mixed solution during ultrasonic dispersion In A, continue to sonicate for 1 hour and...

Embodiment 2

[0037] Embodiment 2, silicon-nitrogen-doped carbon-nitrogen-doped graphene composite material, wherein the mass ratio of graphene oxide: nitrogen-containing carbon source: silicon is 1:2:4, and its preparation steps are as follows:

[0038] Step 1) Disperse 0.4g of silicon powder in 200mL of water, and ultrasonically treat it for 1 hour to obtain an aqueous dispersion of silicon;

[0039] Step 2) dissolving 0.2g glucosamine into 20mL water to obtain a glucosamine solution;

[0040] Steps 3) to 6) are the same as in Example 1.

[0041] (a) and (b) in Fig. 7 show the transmission electron microscope picture of the silicon-nitrogen-doped carbon-nitrogen-doped graphene composite material that present embodiment 2 prepares, and (b) is (a) partial enlarged view, It can be seen from FIG. 7( b ) that the thickness of the carbon layer on the surface of the silicon particles in the composite material prepared in Example 2 is about 6 nm.

Embodiment 3

[0042] Embodiment 3, silicon-nitrogen-doped carbon-nitrogen-doped graphene composite material, wherein the mass ratio of graphene oxide: nitrogen-containing carbon source: silicon is 1:2:6, and its preparation steps are as follows:

[0043] Step 1) Disperse 0.6g of silicon powder in 100mL of water, and ultrasonically treat it for 1 hour to obtain an aqueous dispersion of silicon;

[0044] Step 2) Dissolving 0.2g of glucosamine into 20mL of water to obtain a glucosamine solution;

[0045] Steps 3) to 6) are the same as in Example 1.

[0046] (a) and (b) in Fig. 8 show the transmission electron microscope picture of the silicon-nitrogen-doped carbon-nitrogen-doped graphene composite material that embodiment 3 prepares, and (b) is (a) partial enlarged view, It can be seen from FIG. 8( b ) that the thickness of the carbon layer on the surface of the silicon particles in the composite material prepared in Example 3 is about 3 nm.

[0047] Through the transmission electron microsc...

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Abstract

The invention discloses a silicon-nitrogen doped carbon-nitrogen doped graphene composite material. The silicon-nitrogen doped carbon-nitrogen doped graphene composite material is formed by graphene oxide, a nitrogen-containing carbon source and silicon, wherein a mass ratio of graphene oxide to the nitrogen-containing carbon source to silicon is 1-4:2:2-6; and nitrogen doped carbon with a core-shell structure is obtained through a solution mixing process and a high temperature charring process, and coats silicon particles, and the nitrogen doped carbon coated silicon particles are uniformly inlaid in nitrogen doped graphene interlayer. A preparation method of the composite material comprises the following steps: adding a nitrogen-containing carbon source solution into a silicon dispersion, and carrying out stirring ultrasonic treatment; adding a graphene oxide dispersion solution to the above obtained mixed solution in the ultrasonic process; and carrying out stirring heating, evaporation pulping, freeze drying and high temperature charring in order to obtain the silicon-nitrogen doped carbon-nitrogen doped graphene composite material. The nitrogen-containing carbon source is used to form a carbon layer on the surface of silicon particles and realize nitrogen doping of the carbon layer and graphene, the preparation process is simple, controllable and environmentally-friendly, and the composite material greatly improves the integral electrochemical performances.

Description

technical field [0001] The invention relates to the field of chemical batteries, in particular to a silicon-nitrogen doped carbon-nitrogen doped graphene composite material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of large specific capacity, high working voltage, long cycle life, small self-discharge, no memory effect, and environmental friendliness. Therefore, they are widely used in portable electronic products such as notebook computers, digital cameras, and mobile phones. With the rapid development of new electronic devices and electric vehicles, as a power system, lithium-ion batteries will develop in the direction of higher capacity, longer life, and safer and more reliable. [0003] At present, the most common anode material for lithium-ion batteries in commercial use is graphite, but its theoretical specific capacity is only 372mAh / g, which is not enough to meet the high-capacity requirements of electri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/0525
CPCH01M4/5835H01M10/0525Y02E60/10
Inventor 万怡灶季德惠罗红林熊光耀
Owner TIANJIN UNIV
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