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Preparation method of silicon-based material by taking alloy as reducing agent

A technology of silicon-based materials and reducing agents, applied in chemical instruments and methods, hydrogen production, silicon compounds, etc., can solve the problems of high energy consumption, high cost, inability to effectively achieve uniform dispersion of components, etc., and reduce the reduction temperature , easy operation, and the effect of reducing energy consumption

Inactive Publication Date: 2017-09-22
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of silicon-based materials by mechanical ball milling cannot effectively achieve uniform dispersion of components; while the preparation cost of CVD is too high, and the operating temperature of high-temperature thermal reduction of silicon oxide is higher than 700 ° C, which consumes too much energy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The composition of a silicon-based material is designed to:

[0017] MCM-41, 1g; Magnesium Aluminum Alloy, 1g; AlCl 3 , 8g;

[0018] MCM-41, 1g; magnesium lithium alloy, 1g; AlCl 3 , 8g;

[0019] MCM-41, 1g; Aluminum Calcium Alloy, 1g; AlCl 3 , 8g;

[0020] A method for preparing a silicon-based material using an alloy as a reducing agent comprises:

[0021] 1) Weigh a certain amount of alloy powder, silicon dioxide and aluminum chloride, and perform mechanical ball milling in an argon atmosphere for 10 hours;

[0022] Wherein, the particle size of the alloy powder is 10 nanometers to 100 microns;

[0023] 2) pressing the product of step 1) into blocks, the pressure range is 10 tons;

[0024] 3) Put the product of step 2) into an airtight container, and leave it in an inert atmosphere or vacuum at 300°C for 5 hours; then cool and pulverize;

[0025] 4) Pour the product of step 3) into excess hydrochloric acid and treat for 5 hours; filter and separate, wash and ...

Embodiment 2

[0028] The composition of a silicon-based material is designed to:

[0029] SBA-15, 1g; Al-Li alloy, 1g; AlCl 3 , 8g;

[0030] SBA-15, 1g; Magnesium Aluminum Alloy, 1.5g; AlCl 3 , 8g;

[0031] SBA-15, 1g; magnesium-lithium alloy, 2g; AlCl 3 , 8g;

[0032] A method for preparing a silicon-based material using an alloy as a reducing agent comprises:

[0033] 1) Weigh a certain amount of alloy powder, silicon dioxide and aluminum chloride, and perform mechanical ball milling in an argon atmosphere for 20 hours;

[0034] Wherein, the particle size of the alloy powder is 10 nanometers to 100 microns;

[0035] 2) The product of step 1) is compressed into blocks, and the pressure range is 8 tons;

[0036] 3) Put the product of step 2) into an airtight container, and leave it in an inert atmosphere or vacuum at 250°C for 5 hours; then cool and pulverize;

[0037] 4) Pour the product of step 3) into excess hydrochloric acid and treat for 5 hours; filter and separate, wash and d...

Embodiment 3

[0040] The composition of a silicon-based material is designed to:

[0041] MCM-41, 1g; Al-Li alloy, 1g; ZnCl 2 , 7g;

[0042] MCM-41, 1g; Magnesium Aluminum Alloy, 1g; AlBr 3 , 8g;

[0043] SBA-15, 1g; magnesium-lithium alloy, 1g; ZnCl 2 , 8g;

[0044] A method for preparing a silicon-based material using an alloy as a reducing agent comprises:

[0045] 1) Weigh a certain amount of alloy powder, silicon dioxide and aluminum chloride, and perform mechanical ball milling in an argon atmosphere for 15 hours;

[0046] Wherein, the particle size of the alloy powder is 10 nanometers to 100 microns;

[0047] 2) pressing the product of step 1) into blocks, the pressure range is 10 tons;

[0048] 3) Put the product of step 2) into an airtight container, and leave it in an inert atmosphere or vacuum at 600°C for 10 hours; then cool and pulverize;

[0049] 4) Pour the product of step 3) into excess hydrochloric acid and treat for 5 hours; filter and separate, wash and dry to obt...

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Abstract

The invention relates to a preparation method of a silicon-based material by taking alloy as a reducing agent. The method comprises the steps of taking silicon dioxide as a precursor, mechanically mixing an alloy reducing agent and a low-melting-point salt, pressing a block, and performing sintering in a vacuum or inertia atmosphere at 150-600 DEG C for 2-10 hours; and washing the product with hydrochloric acid and water, and drying the product to obtain the silicon-based material, wherein the silicon dioxide is one of MCM-41, MCM-48, MCM-50 and SBA-15, the alloy reducing agent is one of magnesium alloy and aluminum alloy, the magnesium alloy is one of magnesium aluminum, magnesium lithium, magnesium calcium and magnesium sodium, the aluminum alloy is one of aluminum sodium, aluminum lithium, aluminum calcium and aluminum potassium, the low-melting-point salt is one of aluminum chloride, aluminum bromide , zinc chloride and zinc bromide, the mole ratio of alloy and the silicon dioxide is 2-4, and the mole ratio of the low-melting-point and the silicon dioxide is 3-10. The silicon-based material prepared by the method is small in particle size, is of a porous structure, can be used for a lithium ion battery negative electrode material or a portable hydrogen preparation material, and has very good application prospect.

Description

technical field [0001] The invention relates to a method for preparing an electrode material, in particular to a method for preparing a silicon-based material using an alloy as a reducing agent. Background technique [0002] Silicon has abundant reserves and high lithium storage capacity, so it is a very promising anode material for lithium-ion batteries. However, simple silicon has problems such as poor electrical conductivity, large volume expansion after combining with lithium, and the active material falls off from the electrode surface, which restricts the promotion and application of silicon electrode materials. At present, researchers use metals with good conductivity and large specific surface area, carbon materials and polymers to coat silicon on the surface, which improves the electrochemical performance of silicon electrode materials to a certain extent. [0003] Magasinski [Magasinski A, Dixon P, Hertzberg B, Kvit A, Ayala J, YushinG.Nat.Mater., 2010, 9 (4): 353...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/46H01M10/0525C01B33/023C01B3/06
CPCC01B3/06C01B33/023H01M4/386H01M4/463H01M4/466H01M10/0525Y02E60/10Y02E60/36
Inventor 包健范美强田光磊
Owner CHINA JILIANG UNIV
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