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Nano silica sand grinding preparation method taking polyvinylpyrrolidone as dispersing agent

A technology of polyvinylpyrrolidone and nano-silicon, which is applied in the direction of nanotechnology, nanotechnology, and nanotechnology for materials and surface science, and can solve problems such as high slurry viscosity, low sanding efficiency, and easy aggregation of nano-silicon , to achieve the effect of reducing viscosity and improving efficiency

Pending Publication Date: 2020-07-10
江苏新效新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the nano-silicon prepared by this method has problems such as easy aggregation, high viscosity of the slurry, low sanding efficiency, and poor particle uniformity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The chamber capacity of the pin-pin sand mill is 1 liter, and 1.5 kg of zirconia balls with an average particle size of 0.6 mm are put into its storage tank.

[0022] Disperse 500 g of crude silicon with an average particle diameter of 60 μm in 3000 g of absolute ethanol, and add 4 g of polyvinylpyrrolidone with a molecular weight of 3500 to disperse evenly to obtain a slurry.

[0023] Move the slurry into the storage tank of the sand mill and perform sand milling. The speed of the sand mill is 2200rpm, the cavity temperature is 35±5°C, and the sand milling is finished after 4 hours. Sampling test shows that the average particle size of the silicon particles in the slurry is 0.240 μm.

[0024] Move the slurry into another storage tank with a capacity of 1 liter pin-pin sand mill, drop 1.8 kg of zirconia balls with an average particle size of 0.1 mm in the storage tank, and continue grinding for 10 hours. The rotation speed of the machine is 2400rpm, the chamber tempera...

Embodiment 2

[0026] The chamber capacity of the pin-pin sand mill is 10 liters, and 30 kg of zirconia balls with an average particle size of 0.3 mm are put into its storage tank.

[0027] Disperse 5 kg of crude silicon with an average particle diameter of 1 μm in 35 kg of isopropanol, and add 120 g of polyvinylpyrrolidone with a molecular weight of 152,000 to uniformly disperse to obtain a slurry.

[0028] Move the slurry into the storage tank of the sand mill and perform sand milling. The speed of the sand mill is 1200rpm, the cavity temperature is 30±5°C, and the sand milling is finished after 10 hours. Sampling test shows that the average particle size of the silicon particles in the slurry is 0.106 μm.

Embodiment 3

[0030] The chamber capacity of the turbine sand mill is 90 liters, and 200 kg of zirconia balls with an average particle size of 0.1 mm are put into its storage tank.

[0031] Disperse 45 kg of crude silicon with an average particle diameter of 0.350 μm in 330 kg of isopropanol, and add 90 g of polyvinylpyrrolidone with a molecular weight of 12,000 to uniformly disperse to obtain a slurry.

[0032] Move the slurry into the storage tank of the sand mill and perform sand grinding. The speed of the sand mill is 430rpm, and the cavity temperature is 20±5°C. After 7 hours, add 360g of polyvinyl alcohol (PVA) to the storage tank , After another 15 hours, finish the sanding. Sampling test shows that the average particle size of the silicon particles in the slurry is 0.0527 μm.

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Abstract

The invention discloses a nano silicon sanding preparation method taking polyvinylpyrrolidone as a dispersing agent, which relates to the technical field of production of silicon-carbon negative electrode materials of lithium ion batteries, which comprises the following steps of: dispersing coarse silicon powder into a solvent and a dispersing agent, and sanding in a sand mill with a grinding medium to obtain slurry containing nano silicon; wherein the dispersing agent at least comprises polyvinylpyrrolidone. The nano silicon is prepared by adopting a liquid phase sanding method; through grinding, the silicon particles collide and the grinding medium are subjected to high-speed impact for crushing into nanoscale particles; the dispersing agent polyvinylpyrrolidone plays an extremely important role in crushing of the silicon particles, and the polyvinylpyrrolidone can remarkably reduce aggregation of the silicon particles and viscosity of the slurry, so that sanding efficiency, uniformity of the particles and dispersity of the silicon particles in the solvent are improved. According to the present invention, the coarse silicon powder with the particle diameter of 0.24-60[mu]m can besubjected to the nanocrystallization treatment, and the coarse silicon powder can be monocrystalline silicon or polycrystalline silicon.

Description

technical field [0001] The invention relates to the technical field of production of silicon-carbon negative electrode materials for lithium ion batteries, in particular to the preparation process of nano-silicon. Background technique [0002] Nano-silicon powder is a new generation of photoelectric semiconductor material, which has a wide gap energy semiconductor and is also a high-power light source material. Nano-silicon powder can be mixed into carbon powder or graphite as the negative electrode material of lithium battery, which can greatly increase the capacity of lithium battery. [0003] Lithium-ion batteries are widely used in various fields due to their excellent performance. With the development of science and technology and economy, the performance of lithium-ion batteries is also constantly improving, but it still cannot meet people's requirements for higher capacity and battery life. [0004] At present, most of the negative electrodes of lithium-ion batteries...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/021H01M10/0525H01M4/38B82Y30/00B82Y40/00
CPCC01B33/021H01M10/0525H01M4/386B82Y30/00B82Y40/00Y02E60/10
Inventor 胡效亚黄贺于继明
Owner 江苏新效新材料科技有限公司
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