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Preparation method of silicon-tin-carbon composite material

A carbon composite material and silicon source technology, which is applied to active material electrodes, electrical components, electrochemical generators, etc., can solve the problems of difficult preparation and complex preparation process, and achieve high-quality product performance, simple preparation process and low production cost. Effect

Inactive Publication Date: 2019-09-13
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing silicon-tin-carbon composite materials have complex preparation processes and are not easy to prepare

Method used

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  • Preparation method of silicon-tin-carbon composite material
  • Preparation method of silicon-tin-carbon composite material
  • Preparation method of silicon-tin-carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1. A preparation method of silicon-tin-carbon composite material, the preparation method is as follows:

[0035] (a) Take 3 kg of monocrystalline silicon powder with a particle diameter of 3 μm, wash it sequentially with hydrofluoric acid, sulfuric acid, ethanol and ultrapure water, and dry it in a vacuum drying oven at 90 ° C for 7 hours to obtain product A;

[0036] (b) Mix product A, 0.3kg tin powder and 0.02kg glucose evenly, and use a tablet machine to press at 10Mpa for 2 minutes to make a tablet to obtain product B;

[0037] (c) Put product B into an atmosphere furnace for calcination, specifically heat it to 200°C and keep it warm for 0.5 hours. During the process, the atmosphere furnace is fed with nitrogen, and the air flow rate is 10ml / min. Take it out and cool it, and then grind it into a particle with a particle size of 1 μm. Powder, product C;

[0038] (d) Dissolve 5kg of glucose in pure water to form a 1mol / L solution to obtain product D;

[00...

Embodiment 2

[0043] Example 2. A preparation method of silicon-tin-carbon composite material, the preparation method is as follows:

[0044] (a) Take 4kg of polysilicon powder with a particle diameter of 9 μm, wash it with hydrofluoric acid, sulfuric acid, ethanol and ultrapure water in sequence, and dry it in a vacuum drying oven at 100°C for 8 hours to obtain product A;

[0045] (b) Mix product A, 6.5kg of tin powder and 0.045kg of cornstarch evenly, press with a tablet machine at 10-20Mpa for 3.5min to form a tablet, and obtain product B;

[0046] (c) Put product B into an atmosphere furnace for calcination, specifically heat it to 375°C and keep it warm for 1.75 hours. During the process, the atmosphere furnace is fed with nitrogen, and the air flow rate is 55ml / min. Take it out and cool it, and then grind it to a particle size of 4.5μm powder, get product C;

[0047] (d) Dissolve 6.5kg of cornstarch in pure water to form a 2.5mol / L solution to obtain product D;

[0048] (e) Pour pr...

Embodiment 3

[0052] Example 3. A preparation method of silicon-tin-carbon composite material, the preparation method is as follows:

[0053] (a) Take 5 kg of porous silicon powder with a particle diameter of 15 μm, successively wash it with hydrofluoric acid, sulfuric acid, ethanol and ultrapure water, and dry it in a vacuum drying oven at 110 ° C for 9 hours to obtain product A;

[0054] (b) Mix product A, 1kg of tin powder and 0.07kg of sodium alginate evenly, and use a tablet machine to press at 20Mpa for 5 minutes to make a tablet to obtain product B;

[0055] (c) Put product B into an atmosphere furnace for calcination, specifically heat it to 550°C and keep it warm for 3 hours. During the process, the atmosphere furnace is fed with nitrogen, and the air flow rate is 100ml / min. Take it out and cool it, and then grind it into a particle with a particle size of 10μm. Powder, product C;

[0056] (d) Dissolve 8kg of sodium alginate in pure water to form a 5mol / L solution to obtain produ...

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Abstract

The invention discloses a preparation method of a silicon-tin-carbon composite material. The method comprises the steps of: parts by weight, taking 3-5 parts of a silicon source, performing centrifugal cleaning of the silicon source with hydrofluoric acid, sulfuric acid, ethyl alcohol and ultrapure water, performing drying to obtain a product A; parts by weight, uniformly mixing a product A, 0.3-1parts of tin powder and 0.02-0.07 parts of a carbon source, and performing tabletting to obtain a product B; performing calcining of the product B in an atmosphere furnace, taking out the product B for cooling, and grinding the product B to powder to obtain a product C; dissolving 5-8 parts of the carbon source into pure water to obtain a product D; pouring the product C into the product D for uniform stirring to obtain a product E; putting the product E into a hydrothermal reaction kettle for reaction to obtain a product F; and uniformly mixing the product F, and performing tabletting to obtain a product G; and performing calcining of the product G in the atmosphere furnace, taking out the product G for cooling, and grinding the product G into powder to obtain a finished product. The preparation method of a silicon-tin-carbon composite material is simple in process, good in contact of tin powder and silicon powder and uniform in the carbon coating at the outer surface of the silicon-tin alloy, the tin layer is uniformly distributed between the silicon and the carbon, and the product is good in performance; and moreover, the production cost is low.

Description

technical field [0001] The invention relates to the field of silicon, tin and carbon composite materials, in particular to a method for preparing a silicon-tin-carbon composite material. Background technique [0002] Silicon-tin-carbon composite material is a three-dimensional multilayer structure composite material. Due to its unique properties, this material can be prepared into lithium-ion battery negative electrode materials. Silicon is used as a lithium-ion battery negative electrode material with a theoretical specific capacity of 4200mAh / g. However, silicon materials will have a large volume effect during the charging and discharging process of lithium-ion batteries. As a negative electrode material for lithium-ion batteries, tin has a theoretical specific capacity of The capacity is 372mAh / g, but it has only a small volume effect, so it has good cycle performance. The carbon on the outside of the silicon-tin-carbon composite material can well suppress the silicon and...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/387H01M4/583H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 麦毅万文文侯高蕾吴复忠李水娥戴新义谷肄静
Owner GUIZHOU UNIV
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