Method for preparing porous nanometer silicon through air auxiliary

An air-assisted, nano-silicon technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve problems such as high energy consumption, high reaction temperature, and large pollution

Active Publication Date: 2016-02-24
WUHAN UNIV OF SCI & TECH
View PDF5 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another example is in the patent "A Preparation Method of Nano-Silicon Particles, Negative Electrode Material and Lithium-ion Battery Containing the Nano-Silicon Particles" (CN201110399792.0), nano-silicon is obtained by treating a mixture of silicon dioxide and silicon with hydrofluoric acid, the The method involves a high-temperature disproportionation reaction of silicon monoxide, the reaction temperature is high, the energy consumption is large, and highly corrosive hydrofluoric acid is used, which causes great pollution

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing porous nanometer silicon through air auxiliary
  • Method for preparing porous nanometer silicon through air auxiliary
  • Method for preparing porous nanometer silicon through air auxiliary

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Process the rice husk to obtain 0.6g of silicon dioxide particles and 1g of magnesium powder and mix them uniformly and put them into a sealed stainless steel high-temperature kettle;

[0028] (2) Put the mixture in (1) into a tube furnace filled with inert gas (Ar) and heat it to 650°C at a heating rate of 5°C / min for 6 hours to obtain the product, and take it out after cooling to room temperature with the furnace;

[0029] (3) Put the product obtained in (2) into a corundum crucible, and then directly put it into a muffle furnace and heat it to 600°C for 10 hours at a heating rate of 10°C / min in the air. After the product is cooled to room temperature with the furnace, take it out ;

[0030] (4) Pickling the product obtained in (3) with 1 mol / L hydrochloric acid to remove magnesium oxide, washing, filtering, and drying to obtain porous nano-silicon.

[0031] Depend on figure 1 The XRD diffraction pattern of XRD shows that at 28.4 °, 47.3 ° and 56.1 °, the three ...

Embodiment 2

[0033] (1) Process the rice husk to obtain 0.6g of silicon dioxide particles and 0.6g of magnesium powder and mix them uniformly and put them into a sealed stainless steel high-temperature kettle;

[0034] (2) Put the mixture in (1) into a tube furnace filled with inert gas (Ar) and heat it to 400°C at a heating rate of 10°C / min and keep it for 1 hour to obtain the product. After the product is cooled to room temperature with the furnace, take it out;

[0035] (3) Put the product obtained in (2) into a corundum crucible, and then directly put it into a tube furnace with pure oxygen and heat it to 300°C at a heating rate of 10°C / min for 12h, and wait for the product to cool down to room temperature with the furnace after taking out;

[0036] (4) Pickling the product obtained in (3) with 1 mol / L hydrochloric acid to remove magnesium oxide, washing, filtering, and drying to obtain porous nano-silicon.

Embodiment 3

[0038] (1) Mix 1.2g of silicon dioxide particles obtained by straw treatment with 2g of magnesium powder and put them into a sealed stainless steel high-temperature kettle;

[0039] (2) Put the mixture in (1) into a tube furnace filled with inert gas (Ar) and heat it to 500°C for 3 hours at a heating rate of 1°C / min to obtain the product, and take it out after cooling to room temperature with the furnace;

[0040] (3) Put the product obtained in (2) into a corundum crucible, then directly put it into a muffle furnace and heat it to 500°C for 6 hours at a heating rate of 5°C / min in the air. After the product is cooled to room temperature with the furnace, take it out ;

[0041] (4) Pickling the product obtained in (3) with 1 mol / L hydrochloric acid to remove magnesium oxide, washing, filtering, and drying to obtain three-dimensional porous nano-silicon.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
pore sizeaaaaaaaaaa
Login to view more

Abstract

The invention provides a method for preparing porous nanometer silicon through air auxiliary. The method comprises the following steps that silicon dioxide and an appropriate amount of magnesium powder which are obtained from different sources are evenly mixed and then put into a tube furnace to fully react in an inert atmosphere to obtain magnesium silicide (4Mg+SiO2=Mg2Si+2MgO); the reaction product is put in air or other mixed gas containing oxygen to react (Mg2Si+O2=Si+2MgO) under the appropriate temperature condition to obtain a product, and the product is processed through acid pickling to obtain the high-yield superfine porous nanometer silicon. According to the method, the steps are simple and easy to operate, and a large amount of the porous nanometer silicon can be obtained only by directly heating the obtained magnesium silicide in the air or the gas containing the oxygen; in addition, the source of the raw material silicon dioxide is wide, pollution is little, the yield is high, the obtained nanometer silicon has the advantages that particles are uniform and mesoporous exists, and the method can be widely applied to the field of lithium ion battery anode materials.

Description

technical field [0001] The invention belongs to the technical field of nanometer material synthesis, and in particular relates to an air-assisted method for preparing porous nanometer silicon. Background technique [0002] Silicon is the second most abundant element (approximately 26.4%) in the earth's crust. As a common semiconductor material, it has become an indispensable and important technical basis for modern high-tech society. Elemental silicon has extensive and important applications in energy, semiconductor, organic silicon, and metallurgical industries. At present, the anode materials of mature commercial lithium-ion batteries are mainly graphite carbon materials, but the theoretical lithium storage capacity of carbon materials is only 372mAh / g, which cannot meet people's demand for high energy density materials. Very high theoretical capacity (about 4200mAh / g), ten times the capacity of commercial graphene, has great prospects in energy storage, but the volume ex...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/023
CPCC01B33/023C01P2002/72C01P2004/03C01P2004/04C01P2006/12C01P2006/16
Inventor 高标付继江安威力张旭明彭祥
Owner WUHAN UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap