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Method for preparing nano silicon powder for lithium ion battery cathode material in one step

A technology of lithium-ion batteries and negative electrode materials, applied in grain processing, etc., can solve problems such as difficult liquid-solid separation, harsh process conditions, and hidden dangers of pollution, and achieve the effects of huge industrialization prospects, high energy utilization, and reduced production costs

Inactive Publication Date: 2018-12-21
昆明海创兴科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned technical scheme has obtained nano-silica powder, there are several main problems as follows: the preparation process of wet ball milling process is complicated, the separation of liquid and solid is difficult, waste water and waste gas are generated, and there are hidden dangers of environmental pollution
The cost of other methods is too high, the process conditions are harsh, and the output is too small to achieve mass production

Method used

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  • Method for preparing nano silicon powder for lithium ion battery cathode material in one step
  • Method for preparing nano silicon powder for lithium ion battery cathode material in one step
  • Method for preparing nano silicon powder for lithium ion battery cathode material in one step

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Get 120 grams of silicon powder with a particle size of 3 microns, and 1.2 grams each of stearic acid and oleic acid amide, mix them uniformly and add them to the high-energy ball mill chamber;

[0025] (2) The powder is prepared by using a horizontal high-energy stirring ball mill and dry process technology. A stirring shaft is installed inside the grinding chamber with a condensation jacket, and a stirring blade is arranged on the stirring shaft. Both the stirring blade and the grinding chamber are made of Made of ceramic material lining, the ceramic material used is zirconia, the blade length*width is 120*10 mm, and the gap between the cylinder bulkhead and the stirring blade is 5 mm;

[0026] (3) Add 2400 grams of silicon nitride balls with a diameter of 2 mm into the ball mill chamber, and vacuumize the grinding chamber to 1.0×10 -2 After Pa, dry ice is introduced, and the cooling system switch is turned on. Set the process parameters on the display screen of ...

Embodiment 2

[0028] (1) Take 150 grams of silicon powder with a particle size of 100 microns, and 0.4 grams each of stearic acid and erucamide, mix them uniformly and add them to the high-energy ball mill chamber;

[0029] (2) There is a stirring shaft inside the grinding chamber, and stirring blades are arranged on the stirring shaft, which is equipped with a condensation jacket and can be airtight. Both the mixing blade and the grinding chamber are made of alumina lining, the length*width of the mixing blade is 110*8 mm, and the gap between the bulkhead of the cylinder and the blade is 10 mm;

[0030] (3) Add 4,500 grams of zirconia balls with a diameter of 5 mm to the ball mill chamber, and vacuumize the grinding chamber to 10×10 -1 Argon gas is introduced after Pa, and the cooling water switch is turned on after the air pressure in the chamber reaches 1.15 atmospheres. Set the process parameters on the display screen of the equipment as follows: pre-grind for 12 minutes under the cond...

Embodiment 3

[0032] (1) Get 100 grams of silicon powder raw materials with a particle size of 3 microns and 3.0 grams of industrial additive stearic acid, mix the two evenly and add them to the high-energy ball mill bin;

[0033](2) The grinding bin body is a sealable bin body with a stirring shaft inside, a stirring blade on the stirring shaft, and a condensation jacket. Both the blade and the grinding bin body are made of silicon carbide lining, and the blade length*width 105*7 mm, the gap between the bulkhead of the cylinder and the blades is 12.5 mm; (3) Add 1500 grams of silicon nitride balls with a diameter of 3 mm to the ball mill chamber, and then vacuumize the grinding chamber to 10 Pa. Nitrogen is introduced, and the cooling water switch is turned on after the air pressure in the chamber reaches 1.3 atmospheres. The process parameters are set as follows: pre-grinding for 15 minutes under the condition of the collision speed of the grinding medium is 3 m / s, grinding for 30 minutes...

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Abstract

The invention relates to a method for preparing nano silicon powder for a lithium ion battery cathode material in one step, and belongs to the technical field of nano material and powder preparation.A dry method replaces a traditional wet method; a horizontal high-energy stirring ball mill replaces a roller ball mill and a vertical agitating ball mill, and a blade size and a gap between a bin wall and a blade tip are in certain ranges; at a certain temperature, micron silicon powder and an industrial auxiliary agent are added into a bin body; then a grinding medium is added in; vacuuming is performed, or inert gas is introduced in; grinding time, collision speed of the grinding medium, temperature of the bin body, pressure and the like are set; and thus the nano silicon powder with the average particle size of 50-200 nanometers, the tapping density of 1.2 to 1.5 g / cm<3>, the oxygen content of less than 0.05%, and the impurity content of less than 50 to 200 PPM is obtained and is usedas the cathode material for lithium ion batteries. The whole production process is performed in a closed system; no three wastes are discharged; the technique is simple, low in cost and high in efficiency; and large-scale industrial production is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of nano-materials and powder preparation, and specifically relates to a method for preparing nano-silicon powder for negative electrode materials of lithium-ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high operating voltage, high specific energy, wide operating temperature range, stable discharge, small size, and light weight, and the negative electrode material plays a very important role in it. At present, the anode material of commercialized lithium-ion batteries is mainly graphite, but its specific capacity is low, only 372 mAh / g, and the phenomenon of "lithium precipitation" is prone to occur during fast or low-temperature charging and discharging, which may cause safety hazards and cannot meet the requirements. The development needs of high-power and high-energy lithium-ion batteries. Therefore, it is particularly important to develop anode materials for l...

Claims

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Application Information

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IPC IPC(8): B02C17/10B02C17/16B02C17/18B02C17/20B02C23/06B02C23/04
CPCB02C17/10B02C17/16B02C17/163B02C17/18B02C17/1815B02C17/20B02C23/04B02C23/06
Inventor 蔡晓兰陈正贵张爽
Owner 昆明海创兴科技有限公司
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