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Preparation method and application of nitrogen-doped carbon/silicon nano composite material

A technology of nitrogen-doped carbon and composite materials, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of limited large-scale preparation, complicated preparation process, and poor product consistency. Achieve the effects of reducing energy consumption and labor costs, simplifying experimental steps, and excellent material performance

Pending Publication Date: 2021-08-31
HUBEI ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned methods generally have disadvantages such as complicated preparation process, poor product consistency, high energy consumption, high cost, and limited large-scale preparation.

Method used

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  • Preparation method and application of nitrogen-doped carbon/silicon nano composite material
  • Preparation method and application of nitrogen-doped carbon/silicon nano composite material
  • Preparation method and application of nitrogen-doped carbon/silicon nano composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: a kind of preparation method of nitrogen-doped carbon / silicon nanocomposite material, comprises the steps:

[0038] 1) Ball mill silicon powder (40-100 μm) at a ball-to-material ratio of 40:1 at 500 rpm for 12 hours;

[0039] 2) Disperse 0.5g of silicon powder after ball milling in step 1) into 80mL of deionized water, disperse with 400W ultrasonic wave for 2h to obtain a dispersion, then add 4.5g of acrylic acid, 1.5g of melamine and 0.10g of dodecylbenzene to the dispersion Sodium sulfonate, and stirred for 3h; then add 2mL ammonium persulfate aqueous solution with a mass percentage of 5%, and stir to obtain a mixed solution, then transfer the mixed solution to a large crucible, stir evenly, and then put the large crucible into In a small mobile muffle furnace, under air conditions, the temperature was raised to 80°C at a heating rate of 5°C / min for a polymerization reaction, and the temperature was kept for 3 hours to obtain a polymer / silicon composite ...

Embodiment 2

[0043] Embodiment 2: a kind of preparation method of nitrogen-doped carbon / silicon nanocomposite material, comprises the following steps:

[0044] 1) Ball mill silicon powder (40-100 μm) at a ball-to-material ratio of 40:1 at 500 rpm for 12 hours;

[0045] 2) Disperse 0.5g of silicon powder after ball milling in step 1) into 80mL of deionized water, disperse with 400W ultrasonic wave for 2h to obtain a dispersion, and then add 5.0g of acrylic acid, 1.0g of urea and 0.12g of dodecylbenzene to the dispersion Sodium sulfonate, and stirred for 3h; then add 2mL ammonium persulfate aqueous solution with a mass percentage of 5%, and stir to obtain a mixed solution, then transfer the mixed solution to a large crucible, stir evenly, and then put the large crucible into In a small mobile muffle furnace, under air conditions, the temperature was raised to 80°C at a heating rate of 5°C / min for a polymerization reaction, and the temperature was kept for 3 hours to obtain a polymer / silicon ...

Embodiment 3

[0047] Embodiment 3: a kind of preparation method of nitrogen-doped carbon / silicon nanocomposite material, comprises the steps:

[0048] 1) Ball mill silicon powder (40-100 μm) at a ball-to-material ratio of 40:1 at 500 rpm for 12 hours;

[0049] 2) Disperse 0.5g of silicon powder after ball milling in step 1 into 80mL of deionized water, disperse with 400W ultrasonic for 2h to obtain a dispersion, then add 20.0g of acrylic acid, 5.0g of melamine and 0.15g of dodecylbenzene to the dispersion Sodium sulfonate, and stirred for 3h; then add 2mL ammonium persulfate aqueous solution with a mass percentage of 5%, and stir to obtain a mixed solution, then transfer the mixed solution to a large crucible, stir evenly, and then put the large crucible into In a small mobile muffle furnace, under air conditions, the temperature was raised to 80°C at a heating rate of 5°C / min for a polymerization reaction, and the temperature was kept for 3 hours to obtain a polymer / silicon composite mater...

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Abstract

The invention relates to the technical field of lithium battery materials, and particularly discloses a preparation method and application of a nitrogen-doped carbon / silicon nano composite electrode material. According to the preparation method, commercially available micron-sized silicon powder, a carbon source and a nitrogen source are taken as raw materials, a polymer / silicon composite material precursor is obtained by adopting an in-situ polymerization method, and then the nitrogen-doped carbon / silicon composite material is obtained through high-temperature carbonization. After the nitrogen-doped carbon / silicon composite material is assembled into a lithium ion half-battery, the lithium ion half-battery shows excellent cycle performance, and the lithium ion half-battery still has the specific capacity of about 1000 mA.G<-1> after circulating for 100 circles under the current density of 0.1 A.g<-1>.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a preparation method and application of a nitrogen-doped carbon / silicon nanocomposite material. Background technique [0002] In the rapidly developing information age, the vigorous development of electronic equipment and electric vehicles has put forward higher requirements on the performance of lithium-ion batteries, and it is urgent to develop a new generation of lithium-ion batteries with high energy density and high power. The widely used commercial lithium-ion battery graphite anode material has the advantages of stable cycle performance and good conductivity, but its theoretical capacity is too low, only 372mAh g -1 , far from meeting the market demand for high energy density batteries. Therefore, it is urgent to develop a new generation of high energy density lithium battery anode materials. The theoretical capacity of silicon anode material is extreme...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/0471H01M4/366H01M4/583H01M4/625H01M4/386H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 王锋陶君覃彩芹张贤余链杨宇航
Owner HUBEI ENG UNIV
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