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Silicon-carbon composite material prepared in particle injection method and preparation method thereof

A technology of silicon-carbon composite materials and composite materials, applied in nanotechnology, electrical components, electrochemical generators, etc. for materials and surface science, can solve the problems of reducing expansion rate, poor consistency, and poor uniformity, and achieve reduction Expansion, good uniformity and good consistency

Inactive Publication Date: 2019-03-05
内蒙古欣源石墨烯科技股份有限公司
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Problems solved by technology

[0003] In order to improve the problems of poor uniformity and large expansion rate in the preparation process of silicon-carbon negative electrode materials, the purpose of the present invention is to inject nano-silicon material into the interior of carbon-based materials by particle injection method, so as to reduce the expansion rate and expansion rate of the material. Improve its poor consistency and other issues

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  • Silicon-carbon composite material prepared in particle injection method and preparation method thereof

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preparation example Construction

[0021] see figure 1 , the present invention provides a technical solution: a particle injection method to prepare silicon-carbon composite material and its preparation method, the composite material is composed of carbon series body material and silicon material doped on the surface, and the surface is coated with graphite Graphene composite material, its silicon material content is (1-10)%, wherein: the mass ratio of silicon material, carbon series body material and graphene is:

[0022] Silicon material: carbon series Body material: graphene = (1-10): 100: (10-30);

[0023] The preparation process is as follows: through the particle injection method, the silicon material is implanted in the surface layer of the carbon series bulk material by bombardment with high-speed particle beams, and then carbonized to obtain material A; then the prepared material A is added to the graphene mixed solution , high-speed stirring to obtain a mixed solution, and then prepare a spherical si...

Embodiment 1

[0034] Preparation of graphene mixed solution: Weigh 4g of polyvinylidene fluoride and 4g of sodium carboxymethyl cellulose and add it to 500g of N-methylpyrrolidone, dissolve and disperse evenly to obtain a binder, and then add 2g of γ-aminopropyl tris After the ethoxysilane and 1g of polycarbosilane were stirred evenly, 20g of graphene was added and dispersed evenly at a high speed to obtain a graphene mixture.

[0035] Afterwards, the particle injection method is carried out under an oxygen atmosphere, the gas flow rate is 30 sccm, and the gas pressure is 3 × 10-4Pa. The injection temperature is adjusted to be 300 ° C, and the quality is 5g, and the nano-silicon with a diameter of 50nm is injected into 100g of artificial graphite. Afterwards, crushing, grading, and transfer to a tube furnace, and heating to 800°C under an argon atmosphere for carbonization for 6 hours, to obtain composite material A;

[0036] Afterwards, the prepared composite material A was added to the gr...

Embodiment 2

[0038]Preparation of graphene mixed solution: Weigh 6g of polyvinylidene fluoride and 4g of sodium carboxymethyl cellulose and add it to 500g of N,N-dimethylacetamide, dissolve and disperse evenly to obtain a binder, and then add 1g of γ- (2,3-Glycidyloxy) propyltrimethoxysilane, 0.5g trimethylsilyl clathrate polysilsesquioxane are stirred evenly, and then 10g graphene is added to disperse evenly at a high speed to obtain a graphene mixture liquid.

[0039] Afterwards, the particle injection method is carried out under an oxygen atmosphere, the gas flow rate is 60 sccm, and the gas pressure is 5 × 10-4Pa. The injection temperature is adjusted to be 500 ° C, and the quality is 1g, and the diameter is 20nm. Nano-silicon is injected into 100g of natural graphite, Afterwards, crushing, grading, and transfer to a tube furnace, and heating to 800°C under an argon atmosphere for carbonization for 6 hours, to obtain composite material A;

[0040] Afterwards, the prepared composite ma...

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Abstract

The invention discloses a silicon-carbon composite material prepared in a particle injection method and a preparation method thereof. Specifically, through a particle injection method, high-speed particle beams are used for bombardment to implant a silicon material to a surface layer of a carbon series main body material; then, coating and carbonization of a graphene base material is carried out.The material prepared by the method can reduce expansion of the material and improve the doping consistency between silicon and carbon while improving the gram volume of the material; meanwhile, graphene base composite liquid is coated on the surface of the material, which improves the electrical conductivity of the material and the compatibility of the electrolyte; the prepared silicon-carbon composite material has the characteristics of high gram volume, good rate capability, high cycle performance and the like and improves the rate capability, the cycle performance and the consistency of the lithium ion battery.

Description

technical field [0001] The invention belongs to the field of preparation of lithium-ion battery materials, in particular to a particle injection method for preparing silicon-carbon composite materials and a preparation method thereof. Background technique [0002] With the market's increasing requirements for lithium-ion energy density, and the negative electrode material is the key material for lithium-ion batteries, its performance plays an important role in the cycle performance, safety performance and energy density of lithium-ion batteries. The currently marketed lithium-ion negative electrode materials are mainly graphite series such as artificial graphite and natural graphite, which have a low gram capacity, which seriously restricts the improvement of the energy density of lithium-ion batteries. The silicon carbon negative electrode material is a new type of negative electrode material developed in recent years. It has a high specific capacity but a large expansion c...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/485H01M4/587H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 梁金
Owner 内蒙古欣源石墨烯科技股份有限公司
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