Method for improving dispersion property of nanosilicon grinding fluid

A technique of dispersing performance and abrasive liquid, which is applied in the treatment of dyed low-molecular organic compounds, dyed high-molecular organic compounds, and fibrous fillers. The effect of storage performance and processing performance

Active Publication Date: 2012-10-03
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the number of atoms, specific surface area and surface energy on the surface of nano-silicon will increase rapidly. There are many dangling bonds around the surface atoms, which are unsaturated and easy to combine with other atoms. Prone to agglomeration during placement and use

Method used

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  • Method for improving dispersion property of nanosilicon grinding fluid
  • Method for improving dispersion property of nanosilicon grinding fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1, the coarse silicon powder with a particle size of 60 μm and a silicon content of 95% is poured into a stirring mill, then acetone is added to adjust the solid content to 25%, the rotating speed is 1200r / min, and the rough grinding is carried out for 25 hours. After rough grinding, the particle size is 1 μm. Transfer the coarsely ground silicon grinding liquid to a horizontal nano-ceramic structure sand mill, the mass ratio of the grinding media to the silicon powder is 3:1, add a dispersion medium to ensure that the solid content in the sand grinding process is 17%, and then carry out Sanding, the sanding time is 37h, the rotation speed is 2200r / min, and the silicon grinding liquid after sanding is obtained. Add the strong electrolyte anion dispersant sodium lignosulfonate accounting for 1.2% by weight of the silicon powder to the silicon grinding liquid after sanding, the rotation speed is 500r / min, and the time is 20min to obtain the nano-silicon grinding l...

Embodiment 2

[0037] Example 2, pour the coarse silicon powder with a particle size of 60 μm and a silicon content of 95% into the stirring mill, then add toluene to adjust the solid content to 25%, the rotating speed is 1500r / min, and the rough grinding is carried out for 25 hours. After the rough grinding, the particle size is 1 μm. Transfer the coarsely ground silicon grinding liquid to a horizontal nano-ceramic structure sand mill, the mass ratio of grinding medium to silicon powder is 3.5:1, add dispersion medium to ensure that the solid content in the sand grinding process is 17%, and then carry out Sanding, the sanding time is 37h, the rotation speed is 2200r / min, and the silicon grinding liquid after sanding is obtained. Add the strong electrolyte anion dispersant sodium lignosulfonate accounting for 1.2% by weight of the silicon powder to the silicon grinding liquid after sanding, the rotation speed is 2000r / min, and the time is 30min to obtain the nano-silicon grinding liquid. Pl...

Embodiment 3

[0039] Example 3, the coarse silicon powder with a particle size of 50 μm and a silicon content of 95% is poured into the stirring mill, and then ethanol is added to adjust the solid content to 10%, the rotating speed is 1500r / min, and the rough grinding is carried out for 10 hours. After the rough grinding, the particle size is 3 μm. Transfer the coarsely ground silicon grinding liquid to a horizontal nano-ceramic structure sand mill, the mass ratio of the grinding media to the silicon powder is 3:1, add a dispersion medium to ensure that the solid content in the sand grinding process is 10%, and then carry out Sanding, the sanding time is 80h, the number of revolutions is 2700r / min, and the silicon abrasive liquid after sanding is obtained. Add the strong electrolyte anion dispersant sodium lignosulfonate accounting for 0.1% by weight of the silicon powder to the silicon grinding liquid after sanding, the rotation speed is 2500r / min, and the time is 20min to obtain the nano-...

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Abstract

The invention discloses a method for improving the dispersion property of nanosilicon grinding fluid. The technical problem to be solved is to improve the storage and processing performances of nanosilicon. The method comprises the following steps: adding a dispersion medium to silica fume to obtain silicon grinding fluid; adding a grinding medium to the silicon grinding fluid to obtain sand grinded silicon grinding fluid; and adding an anionic dispersing agent to the sand grinded silicon grinding fluid to obtain nanosilicon grinding fluid. Compared with the prior art, the strong electrolyte anion dispersing agent adsorbed and dispersed on nanosilicon particles is used to modify the nanosilicon particles. The anion is adsorbed on the nanosilicon particles to enable the nanosilicon to have negative charges. Repulsive force between the negative charges makes the nanosilicon particles disperse and suspend in the dispersion medium, so that the dispersion property of nanosilicon in nanosilicon grinding fluid is improved and the nanosilicon is prevented from reuniting in the processes of storage and using, thereby improving the storage and processing performances.

Description

technical field [0001] The invention relates to a preparation method of a nano-silicon grinding liquid, in particular to a method for improving the performance of a nano-silicon grinding liquid used in negative electrode materials. Background technique [0002] So far, silicon has the highest theoretical capacity among anode materials. Li and Si form an alloy Li x Si(0<x≤4.4), it is generally believed that at room temperature, the lithium-rich product produced by the alloying of silicon negative electrode and lithium is mainly Li 3.75 Si phase, the capacity is as high as 3572mAh / g, which is much larger than the theoretical capacity of graphite, but with the huge volume change during charging and discharging, its volume expansion is as high as 270%. The collapse and peeling of the active material cause the electrode to lose electrical contact, and the capacity of the electrode is greatly reduced or even completely failed. Especially for ordinary pure silicon, the cycle ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/28C09C3/10C09C3/08
Inventor 刘祥岳敏肖翠翠黄友元
Owner BTR NEW MATERIAL GRP CO LTD
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