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Preparation method of nanometer silicon composite material with core-shell structure

A composite material, shell-core structure technology, applied in the field of nanomaterials, can solve the problems of nano-silicon material agglomeration and oxidation, difficulty of silicon nanopowder, influence of product purity, etc., to prevent agglomeration and oxidation, high material utilization rate, good choice Effects of Sexual Doping Effects

Active Publication Date: 2013-09-18
宁波革鑫新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of solid solubility, it is very difficult to prepare silicon nanopowder with high doping content
[0004] The preparation method described in the patent CN102910630A is to pulverize the silicon block into micron-sized particles by mechanical ball milling, gasify the silicon particles in argon plasma, then cool and condense them into nano-silicon particles, and collect them into silicon powder by conventional methods, but this In the process of crushing silicon ingots, physical and mechanical collisions or friction will inevitably introduce new impurities, which will affect the purity of the final product, and unprotected nano-silicon materials are prone to agglomeration and oxidation, and are not easy to store

Method used

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  • Preparation method of nanometer silicon composite material with core-shell structure
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  • Preparation method of nanometer silicon composite material with core-shell structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Such as figure 1 and figure 2 Shown: A protective atmosphere is introduced into the DC arc discharge generator, and the silicon rod is loaded into the anode of the arc generator and becomes a part of the anode. The second electrode 4 rotates under the drive of the connected rotary motor 5 at a speed of 30 rpm. It can be observed that a continuous spark discharge occurs between the first electrode 3 and the second electrode 4 . When discharging, the voltage drops from the set value of 300V to 20V, and the current rises from the set value of 16.7A to 250A. After each spark discharge, the stepper motor 1 moves the first electrode 3 to make it short-circuit with the second electrode 4, and then moves the first electrode 3 back to the set electrode spacing of 1 mm for the next spark. discharge. After 4 hours of continuous operation, about 4 kg of silicon powder was collected. The micron-sized silicon particles were spherical, with an average diameter of 50 microns and a...

Embodiment 2

[0066] Such as figure 1 and figure 2 As shown, a protective atmosphere is introduced into the DC arc discharge generator, and the silicon rod is loaded into the anode of the arc generator and becomes a part of the anode. The second electrode 4 is driven to rotate by the connected rotating motor 5 at a speed of 20 revolutions per minute. It can be observed that a continuous spark discharge occurs between the first electrode 3 and the second electrode 4 . When discharging, the voltage drops from the set value of 350V to 10V, and the current rises from the set value of 15A to 250A. After each spark discharge, the stepper motor 1 moves the first electrode 3 to make it short-circuit with the second electrode 4, and then moves the first electrode 3 back to the set electrode spacing of 0.8mm, and proceeds to the next step. spark discharge. After 2 hours of continuous operation, about 3 kg of silicon powder was collected, and the micron-sized silicon particles were spherical with...

Embodiment 3

[0069] A protective atmosphere is introduced into the DC arc discharge generator, and the silicon rod is loaded into the anode of the arc generator and becomes a part of the anode. The second electrode 4 rotates under the drive of the connected rotary motor 5 at a speed of 30 rpm. It can be observed that a continuous spark discharge occurs between the first electrode 3 and the second electrode 4 . When discharging, the voltage drops from the set value of 300V to 20V, and the current rises from the set value of 16.7A to 250A. After each spark discharge, the stepper motor 1 moves the first electrode 3 to make it short-circuit with the second electrode 4, and then moves the first electrode 3 back to the set electrode spacing of 1 mm for the next spark. discharge. After 4 hours of continuous operation, about 4 kg of silicon powder was collected. The micron-sized silicon particles were spherical, with an average diameter of 50 microns and a purity higher than 6N.

[0070]Open th...

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Abstract

The invention discloses a preparation method of a nanometer silicon composite material with a core-shell structure. A silicon rod of a high-purity semiconductor (9N-grade crystal silicon) or solar-grade (6N-grade crystal silicon) cast ingot is directly adopted, the content of phosphorus or boron as a semiconductor silicon doped element is strengthened through the approaches of arc discharge, high temperature plasma gasification, activation treatment and solution grafting, the conversion ratio and purity of a finished product are higher, and a silicon nanosphere has the core-shell structure, so that the prepared nanometer silicon composite material is not easy to agglomerate and oxidize, easy to store, simple and feasible in preparation method and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a method for preparing a nano-silicon composite material with a core-shell structure, especially a method capable of large-scale production. Background technique [0002] The existing nano-silicon preparation methods can be classified into two categories: the first method is to crack small molecules to form nano-silicon particles (Bottom Up). Usually silane (CH 4 ) to dehydrogenate the raw material by using the energy of high-power laser or plasma, and break the Si-H bond to generate Si-Si bond, silicon nucleus (Si X ), and even silicon particles. Common problems of this type of method are incomplete dehydrogenation, low conversion rate of raw materials, and low yield. Due to incomplete dehydrogenation, the products often contain hazardous gases, such as unreacted raw material gases (CH 4 ), the reaction intermediate polysilane, and the by-product hydr...

Claims

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Application Information

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IPC IPC(8): H01M4/36B82Y40/00C01B33/021
CPCY02E60/10
Inventor 刘国钧杨小旭沈晓东唐云俊
Owner 宁波革鑫新能源科技有限公司
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