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Carbon coated micron silicon, preparation method and application thereof

A carbon coating and magnesium silicide technology, applied in the field of its preparation and carbon coating micro-silicon, can solve the problems of unfavorable large-scale production and application, poor safety, complicated preparation process, etc., and achieves favorable contact, low cost, and favorable The effect of conduction

Active Publication Date: 2018-07-10
WUHAN UNIV OF SCI & TECH
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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a carbon-coated porous micro-silicon, its preparation method and application, the purpose of which is to react magnesium silicide with carbon dioxide in an atmosphere containing carbon dioxide Or magnesium silicide reacts with carbon dioxide after decomposition, and then obtains carbon-coated micro-silicon material by pickling. The preparation process of micron silicon material is complex and poor in safety, which is not conducive to the technical problems of large-scale production and application

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  • Carbon coated micron silicon, preparation method and application thereof
  • Carbon coated micron silicon, preparation method and application thereof
  • Carbon coated micron silicon, preparation method and application thereof

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preparation example Construction

[0028] The invention provides a method for preparing carbon-coated micro-silicon, comprising the following steps:

[0029] (1) Using magnesium silicide as a raw material, react in an atmosphere containing carbon dioxide at 400-800°C for 2-24 hours to obtain a crude product containing magnesium oxide and carbon-coated silicon; the atmosphere containing carbon dioxide is a carbon dioxide atmosphere or carbon dioxide Mixed atmosphere with inert gas. Using magnesium silicide as a raw material, the reaction that occurs in an atmosphere containing carbon dioxide can be a redox reaction between magnesium silicide and carbon dioxide Mg 2 Si+CO 2 →Si+2MgO+C; when the temperature rises above 750°C, the decomposition reaction of magnesium silicide may also occur to generate magnesium vapor and simple silicon, and magnesium vapor and carbon dioxide may further react to generate magnesium oxide and carbon. Both are in-situ reactions, and the surface of the silicon produced by the reactio...

Embodiment 1

[0038] (1) Mix commercial silicon particles and magnesium powder in a mass ratio of 1:1.8 and put them into the container evenly;

[0039] (2) Put the container containing the reactant into a high-temperature furnace filled with inert gas and heat it to 700°C at a heating rate of 5°C / min. The holding time is 6h to obtain the product magnesium silicide. After the product is cooled to room temperature with the furnace, take it out ;

[0040] (3) Put the product obtained in (2) into a ball mill tank protected by argon for ball milling, and then screen to obtain micron particles of magnesium silicide with different sizes, the particle size is 0.2-10 microns.

[0041] (4) 2g of magnesium silicide that has been ball-milled in (3) is placed in a tube furnace, and the specific device is as follows: figure 1 as shown, figure 1 It is a model diagram of the tube furnace device. The crucible for sample loading is covered by two U-shaped stainless steels, and the sample and CO 2 The rea...

Embodiment 2

[0047] (1) Mix commercial silicon particles and magnesium powder in a mass ratio of 1:1.5 and put them into the container evenly;

[0048] (2) Put the container containing the reactant into a high-temperature furnace filled with inert gas and heat it to 400°C at a heating rate of 5°C / min, and the holding time is 12h to obtain the product magnesium silicide. After the product is cooled to room temperature with the furnace, take it out ;

[0049] (3) Putting the product obtained in (2) into a ball mill jar protected by argon for ball milling, and then screening to obtain magnesium silicide micron particles of different sizes, the particle size being 1-8 microns.

[0050] (4) 2g of magnesium silicide that has been ball-milled in (3) is placed in a tube furnace, and the specific device is as follows: figure 1 as shown, figure 1 It is a model diagram of the tube furnace device. The crucible for sample loading is covered by two U-shaped stainless steels, and the sample and CO 2 T...

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Abstract

Belonging to the technical field of inorganic material preparation, the invention more specifically discloses a carbon coated micron silicon, a preparation method and application thereof. The method includes: reacting magnesium silicide with carbon dioxide in an atmosphere containing carbon dioxide, or decomposing magnesium silicide, then reacting the decomposed product with carbon dioxide, and conducting pickling to obtain the carbon coated micron silicon material. The preparation method is simple and practicable, can be used for large-scale production of carbon coated micron silicon, and cansolve the technical problems of complex technology, poor security, and no good for mass production application of carbon coated micron silicon materials in the prior art.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic materials, and more specifically relates to a carbon-coated micro-silicon, its preparation method and application. Background technique [0002] In recent years, with the development of new energy technology, electronic equipment is developing in the direction of intelligence and portability, and the requirements for battery technology are getting higher and higher. The capacity of the battery must be high and the electrochemical performance must be stable. Therefore, the high specific energy lithium-ion battery industry came into being. The negative electrode material used in lithium-ion batteries is one of the key factors determining its performance. At present, lithium-ion battery anode materials are mainly carbon materials and non-carbon materials. Among non-carbon anode materials, silicon materials have the highest theoretical capacity of commercial graphite anodes due to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 霍开富高标项奔安威力付继江
Owner WUHAN UNIV OF SCI & TECH
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