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Dispersion method for nanometer silicon

A technology of nano-silicon and nano-silica powder, which is applied in the treatment of dyed polymer organic compounds, electrical components, battery electrodes, etc., can solve the problems of unsatisfactory effect, unreasonable molecular structure design, unsatisfactory dispersion and stabilization effect, etc. problem, to achieve the effect of simple and effective structure, improvement of agglomeration problems, and simple structure

Active Publication Date: 2015-12-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned methods all directly use common dispersants on the market, and fail to conduct further research on the surface properties of the solute to be dispersed and the screening of dispersants, and the dispersion and stabilization effects achieved are not ideal.
At present, many hyperdispersants have been designed for nanomaterials, but the molecular structure design of most hyperdispersants is not reasonable, resulting in unsatisfactory effects.

Method used

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  • Dispersion method for nanometer silicon

Examples

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Embodiment 1

[0038] A method for dispersing nano-silicon of the present invention, comprising the following steps: adding nano-silicon powder (severe agglomeration, average particle is about 80nm) produced by Guilin Institute of Mineral Geology into pure water and stirred evenly to form a solid content of 1% placed in an ultrasonic cleaner to control the water temperature at 20-30°C and disperse for 20 minutes under the condition of ultrasonic power of 300w, and then add polyether hyperdispersants with multi-anchor groups (molecular weight: 2000 ), using mechanical stirring for 6h to obtain a uniformly dispersed nano-silicon dispersion. The measured particle size of the nano-silicon dispersion is 191nm; image 3 as shown,

[0039] The particle size of the nano-silicon dispersion prepared in this example was sealed and left for 15 days and measured to be 207 nm, and then placed in a constant temperature water bath at 80° C. for 40 hours, and the particle size was measured to be 201 nm.

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Embodiment 2

[0044] A method for dispersing nano-silicon of the present invention, comprising the following steps: adding nano-silicon powder (severe agglomeration, average particle is about 80nm) produced by Guilin Institute of Mineral Geology into pure water and stirred evenly to form a solid content of 1% Using a high-speed disperser to disperse at a speed of 30,000r / min for 20 minutes, then add a multi-anchor group polyether hyperdispersant (molecular weight: 2000) with 10% of the mass of silicon powder, and use mechanical stirring for 6 hours to obtain a uniformly dispersed nano-silicon liquid. Silicon dispersion. The particle size of the nano-silicon dispersion was measured to be 233nm; the particle size of the nano-silicon dispersion was measured to be 231nm after being sealed and left to stand for 15 days.

Embodiment 3

[0048] A method for dispersing nano-silicon of the present invention, comprising the following steps: adding nano-silicon powder (severe agglomeration, average particle is about 80nm) produced by Guilin Institute of Mineral Geology into pure water and stirred evenly to form a solid content of 5% placed in an ultrasonic cleaner to control the water temperature to 20-30°C and disperse for 20 minutes under the condition of an ultrasonic power of 300w, and then add a multi-anchor group polyether hyperdispersant (molecular weight: 2000 ), using mechanical stirring for 6h to obtain a uniformly dispersed nano-silicon dispersion. The particle size of the nano-silicon dispersion was measured to be 223nm. The particle size was measured to be 231nm after being sealed and left for 15 days, and the particle size was measured to be 229nm after being placed in a constant temperature water bath at 80°C for 40 hours.

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Abstract

The invention discloses a dispersion method for nanometer silicon. The dispersion method comprises the following steps: (1) dissolving nano silicon powder into a polar solvent, and stirring to prepare a nano silicon solution with the solid content of 1-20 percent; (2) pre-dispersing the nano silicon solution by physical dispersion; (3) adding a multi-anchoring-group polyether type super dispersant into the pre-dispersing solution, and uniformly stirring to obtain a uniformly stirred nano silicon dispersing solution. By adoption of a mechanical dispersion and chemical dispersion combining method and selection of the multi-anchoring-group polyether type super dispersant matched with the surface of the nano silicon and the property of the solvent, the nano silicon pre-dispersing solution with higher dispersion property and stability is obtained, and the severe agglomeration problem in application of the nano silicon powder in a silicon carbon negative electrode material is solved.

Description

technical field [0001] The invention relates to a method for dispersing nano-silicon, in particular to a method for dispersing nano-silicon by using a multi-anchor group polymer hyperdispersant. Background technique [0002] Silicon is the focus material of lithium-ion battery anode material research in recent years. Silicon has a very high theoretical capacity (up to 4200mAh / g), and is an excellent substitute for graphite materials. It is much larger than the theoretical capacity of graphite, and it is not solvated like graphite. However, it has a huge volume effect in the process of charging and discharging, up to 400%. Due to its huge volume effect during the cycle, the pure silicon material will repeatedly form an SEI film on its surface during the repeated expansion and contraction during the charging and discharging process, which consumes the electrolyte, resulting in a rapid decline in capacity, and in the process of expansion and contraction. In the process, the co...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/38H01M4/62C09C1/00C09C3/10
CPCY02E60/10
Inventor 李新海张辉华郭华军王志兴杨阳彭文杰胡启阳
Owner CENT SOUTH UNIV
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