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Ball milling preparation method of rice hull-based porous silicon nanomaterial

A technology of silicon nanometer and porous silicon is applied in the field of preparation of rice husk-based porous silicon nanometer materials, which can solve the problems of high raw material price and unfavorable preparation process, and achieve the effects of lowering reaction temperature, simple operation and low price.

Inactive Publication Date: 2017-01-04
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, high raw material prices and complex preparation processes are not conducive to market development. Therefore, seeking cheap raw materials and simple preparation routes is of great significance for the development of the energy storage industry

Method used

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  • Ball milling preparation method of rice hull-based porous silicon nanomaterial
  • Ball milling preparation method of rice hull-based porous silicon nanomaterial
  • Ball milling preparation method of rice hull-based porous silicon nanomaterial

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1: Take the washed and dried rice husk as raw material, heat and oxidize the rice husk with a microwave device at 1000 W for 30 minutes in an air atmosphere to obtain rice husk ash, then soak it in dilute hydrochloric acid, and finally wash it repeatedly with distilled water and dry it to obtain the dried of rice husk ash.

[0032] Step 2: Combine the dried rice husk ash with aluminum powder and AlCl 3 Mix at a mass ratio of 1:1:10 to obtain a mixture.

[0033] Step 3: Put the mixture in an agate jar filled with inert gas, and use a planetary ball mill for ball milling with a mass ratio of ball to material of 5:1, a rotational speed of 400 rpm, and a milling time of 20 h.

[0034] Step 4: After the ball milling, cool naturally to the greenhouse to collect the product, soak it with 0.1 M dilute hydrochloric acid, wash it repeatedly with distilled water, and finally remove the residual silicon oxide with a hydrofluoric acid solution with a mass percentage of 3% to o...

Embodiment 2

[0042] Step 1: Take the washed and dried rice husk as raw material, heat and oxidize the rice husk with a microwave device at 1000 W for 30 minutes in an air atmosphere to obtain rice husk ash, then soak it in dilute hydrochloric acid, and finally wash it repeatedly with distilled water and dry it to obtain the dried of rice husk ash.

[0043] Step 2: Combine the dried rice husk ash with aluminum powder, magnesium powder, AlCl 3 Mix at a mass ratio of 1:1:1:9 to obtain a mixture.

[0044] Step 3: Put the above mixture in an agate jar filled with inert gas, and use a planetary ball mill for ball milling with a mass ratio of ball to material of 5:1, a rotational speed of 800 rpm, and a ball milling time of 16 h.

[0045] Step 4: After ball milling, cool naturally to the greenhouse to collect the product, soak it in 0.1M dilute hydrochloric acid, wash it repeatedly with distilled water, and finally remove the residual silicon oxide with 3% hydrofluoric acid solution to obtain th...

Embodiment 3

[0050] Step 1: Take the washed and dried rice husk as raw material, heat and oxidize it with a microwave device at 800 W for 15 minutes in an air atmosphere to obtain rice husk ash, then soak it in dilute hydrochloric acid, and finally wash it repeatedly with distilled water and dry it to obtain the dried of rice husk ash.

[0051] Step 2: Combine the dried rice husk ash with aluminum powder, magnesium powder, AlCl 3 Mix at a mass ratio of 1:0.5:0.5:12 to obtain a mixture.

[0052] Step 3: Put the above mixture in an agate jar filled with an inert gas, and use a planetary ball mill for ball milling with a ball-to-material mass ratio of 4:1, a rotational speed of 600 rpm, and a ball milling time of 16 h.

[0053] Step 4: After the ball milling, cool naturally to the greenhouse to collect the product, soak it in 0.1M dilute hydrochloric acid, wash it repeatedly with distilled water, and finally remove the residual silicon oxide with 2M NaOH solution at 70°C to obtain rice husk-...

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Abstract

The present invention provides a ball milling preparation method of a rice hull-based porous silicon nanomaterial, belonging to the technical field of preparation of nano-electrode materials. The method comprises the steps of heating to oxidize or incompletely oxidize water-washed and dried rice hull in air, so as to obtain rice hull ash, then soaking by using dilute hydrochloric acid, washing with distilled water and then drying, and obtaining the dried rice hull ash; and mixing the dried rice hull ash with aluminum powder, or aluminum powder, magnesium powder and a corresponding chloride so as to obtain a mixed material, then putting the mixed material in a ball milling machine to grind and cool to room temperature, collecting the product, soaking with dilute hydrochloric acid, then washing with distilled water so as to obtain the rice hull-based porous silicon nanomaterial. The preparation method is simple, the cost of the raw material is low, the yield is high, solid phase reaction is good for industrial production, and the prepared rice hull-based porous silicon nanomaterial has excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanometer electrode materials, in particular to the preparation technology of rice husk-based porous silicon nanomaterials. Background technique [0002] With the depletion of fossil resources and the aggravation of environmental problems, human beings urgently need clean, efficient and sustainable energy, as well as related new energy conversion and storage technologies. Energy storage devices are one of the indispensable key devices in modern society. The theoretical specific capacity of graphite carbon anode materials for lithium-ion batteries is only 372 mAh / g, and the rate performance is poor, and the tap density is small, which cannot meet the needs of high-energy lithium-ion batteries. Therefore, it is imperative to find anode materials with high specific capacity to replace graphite. Silicon has a theoretical specific capacity of up to 4200 mAh / g and a moderate voltage platform, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525
CPCH01M4/362H01M4/386H01M4/583H01M10/0525Y02E60/10
Inventor 侯建华王雪蒋欣韩峰窦倩沈明
Owner YANGZHOU UNIV
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