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A kind of preparation method and application of nano-silicon material

A technology of nano-silicon and nano-silicon powder, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of increasing equipment cost and environmental pollution, unfavorable to industrial production, reducing material performance, etc. problems, to avoid hard agglomeration, facilitate grinding, and reduce grinding time.

Active Publication Date: 2021-04-13
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this invention can use industrial waste to prepare nano-silicon, the pickling process introduces a relatively high concentration of hydrogen ions, which will increase equipment costs and environmental pollution for industrial mass production on the one hand; Reduce material properties
At the same time, the invention prepares 100nm nano-silicon particles, and the grinding time exceeds 30 hours, which will greatly reduce production capacity and is not conducive to industrial production.

Method used

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  • A kind of preparation method and application of nano-silicon material
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  • A kind of preparation method and application of nano-silicon material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method of nano-silicon material of the present invention, comprises the following steps:

[0037] (1) Weigh 1 kg of industrial silica fume, place it in a jaw crusher for crushing for 2 hours, and place it in a ball mill for crushing for 3 hours to obtain coarse silica fume with a particle size of 50-500um;

[0038] Add 4kg of absolute ethanol to the obtained coarse silicon powder, pass through a 32-mesh sieve after high-speed stirring at 500rpm, and obtain a coarse silicon powder slurry;

[0039] (2) Add boron nitride balls (the median diameter of the boron nitride balls are 0.3mm, 3mm, 50mm, and the mass ratio is 3:2:1) to the coarse silicon powder slurry prepared in step (1), Proportion according to the material mass ratio of 1:1;

[0040]Put the slurry in a high-energy planetary ball mill with a closed protective gas (high-purity nitrogen) and grind it for 15 hours (rotational speed 800rpm), and pass through a 325-mesh sieve to obtain a uniformly dispe...

Embodiment 2

[0045] A preparation method of nano-silicon material of the present invention, comprises the following steps:

[0046] (1) Weigh 500g of polysilicon block, place it in a jaw crusher for crushing for 2 hours, and crush it in a ball mill for 2 hours to obtain coarse silicon powder with a particle size of 50-500um;

[0047] Add 9kg of isopropanol to the obtained coarse silicon powder, and pass through a 32-mesh sieve after high-speed stirring (500rpm), to obtain a coarse silicon powder slurry;

[0048] (2) Add zirconia balls (the median diameter of zirconia balls are 0.5mm, 5mm, 80mm, and the mass ratio is 3:2:1) to the coarse silica powder slurry prepared in step (1), according to the material The mass ratio is 1:1 for proportioning;

[0049] Put the slurry in a high-energy planetary ball mill with a closed protective gas (high-purity argon) and grind it (rotation speed: 800rpm) for 10 hours, and pass through a 325-mesh sieve to obtain a uniformly dispersed micron-sized silicon...

Embodiment 3

[0059] A preparation method of nano-silicon material of the present invention, comprises the following steps:

[0060] (1) Weigh 500g of silicon microcrystals, place them in a jaw crusher for crushing for 2 hours, and place them in a ball mill for crushing for 3 hours to obtain coarse silicon powder, the particle size of which is concentrated at 50-500um;

[0061] Add 5kg of polyvinylpyrrolidone to the prepared coarse silicon powder, and pass through a 32-mesh sieve after high-speed stirring (200rpm) to obtain a coarse silicon powder slurry;

[0062] (2) Add tungsten carbide spheres (the median diameter of tungsten carbide spheres are 1.0mm, 10mm, 50mm, wherein the mass ratio is 3:2:1) to the coarse silicon powder slurry prepared in step (1), according to The material mass ratio is 1:1 for proportioning;

[0063] Put the slurry in a cone mill with a closed protective gas (argon) and grind it at a speed of 2000rpm for 10h, pass through a 325-mesh sieve to obtain a uniformly di...

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Abstract

The invention discloses a preparation method of a nano-silicon material, which comprises the following steps: (1) grinding a coarse silicon slurry to obtain a micron-sized silicon powder slurry; (2) adding carbon to the micron-sized silicon powder slurry; Grinding the material to obtain a nano-silicon powder slurry; (3) drying, crushing, sieving, and demagnetizing the nano-silicon powder slurry to obtain a nano-silicon material. In the preparation method of the present invention, carbon materials are added as grinding media, which can promote finer granular grinding on the one hand; on the other hand, carbon materials replace traditional dispersants, effectively avoiding the generation of hard agglomeration between nano-silicon particles, reducing The residual dispersant can effectively improve the conductivity of the material and further improve the electrochemical performance of the material.

Description

technical field [0001] The invention belongs to the field of preparation of nanometer powder, and in particular relates to a method for preparing nanometer silicon material applied to negative electrode materials of lithium ion batteries. Background technique [0002] At present, graphite is the main anode material for commercialized lithium-ion batteries, with a theoretical specific capacity of 372mAh / g. The development capacity of existing technologies of 350-360mAh / g is close to the theoretical value, and the development potential is limited. In addition, the four ministries clearly stated in the "Action Plan for Promoting the Development of the Automotive Power Battery Industry" that the specific energy of a single battery should be ≥300Wh / kg. The use of graphite anodes cannot meet this demand, so the development of new high-capacity anode materials appears to be Especially critical. [0003] Due to the advantages of high lithium storage capacity (theoretical specific c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 涂飞跃汤刚杨乐之陈涛黎天保殷敖彭青姣王艳华覃事彪
Owner CHANGSHA RES INST OF MINING & METALLURGY
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