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A kind of dispersion method of nano silicon

A technology of nano-silicon and nano-silicon powder, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., to achieve the effect of improving cycle performance, improving electrochemical performance, and good dispersion structure

Active Publication Date: 2021-04-06
四川创能新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] At present, most of the common dispersants are added in the ball milling process of nano-silicon, which fails to further screen the dispersants according to the surface properties of the dispersed solute

Method used

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  • A kind of dispersion method of nano silicon
  • A kind of dispersion method of nano silicon
  • A kind of dispersion method of nano silicon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The method for dispersing the nano-silicon provided by the present embodiment comprises the following steps:

[0035] (1) Crushing the coarse silicon powder by air flow to micro silicon powder with an average particle size of 3-5 μm;

[0036] (2) Dissolving microsilica powder in absolute ethanol, and stirring to form a silicon solution with a solid content of 15%;

[0037] (3) The silicon solution is ball-milled by wet ball-milling process, the ball-to-material ratio of the ball mill is 3:1, the diameter of the ball-milling medium is 1mm, the ball-milling speed is 1200r / min, the ball-milling time is 8h, the ball-milling temperature is 28°C, and during the ball-milling process, add The total amount of silicon solution is 1.5% cetyltrimethylammonium bromide ion dispersant, and the nanometer silicon powder can be obtained after ball milling. The measured particle size of the nano-silicon powder is 85nm, and its transmission electron microscope picture is as follows figur...

Embodiment 2

[0039] The method for dispersing the nano-silicon provided by the present embodiment comprises the following steps:

[0040] (1) Crushing the coarse silicon powder by air flow to micro silicon powder with an average particle size of 3-5 μm;

[0041] (2) Dissolving microsilica powder in absolute ethanol, and stirring to form a silicon solution with a solid content of 15%;

[0042] (3) The silicon solution is ball-milled by wet ball-milling process, the ball-to-material ratio of the ball mill is 3:1, the diameter of the ball-milling medium is 1mm, the ball-milling speed is 1200r / min, the ball-milling time is 8h, the ball-milling temperature is 26°C, and during the ball-milling process, add The total amount of silicon solution is 0.5% cetyltrimethylammonium bromide ion dispersant, and the nanometer silicon powder can be obtained after ball milling.

Embodiment 3

[0044] The method for dispersing the nano-silicon provided by the present embodiment comprises the following steps:

[0045] (1) Crushing the coarse silicon powder by air flow to micro silicon powder with an average particle size of 3-5 μm;

[0046] (2) Dissolving microsilica powder in absolute ethanol, and stirring to form a silicon solution with a solid content of 15%;

[0047] (3) The silicon solution is ball-milled by wet ball-milling process, the ball-to-material ratio of the ball mill is 3:1, the diameter of the ball-milling medium is 1mm, the ball-milling speed is 1200r / min, the ball-milling time is 8h, the ball-milling temperature is 27°C, and during the ball-milling process, add The total amount of silicon solution is 1% hexadecyltrimethylammonium bromide ion dispersant, and the nanometer silicon powder can be obtained after ball milling.

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Abstract

The invention discloses a method for dispersing nano-silicon, which comprises the following steps: (1) crushing coarse silicon powder into micro-silicon powder with an average particle diameter of 3-5 μm through air flow; (2) dissolving micro-silicon powder in polar Solvent and stirring to form a silicon solution with a solid content of 10%-15%; (3) the silicon solution is ball-milled by a wet ball milling process, and cetyltrimethylammonium bromide ion dispersant is added during the ball milling process, Nano silicon powder can be obtained after ball milling. In the present invention, by accurately adding cetyltrimethylammonium bromide ion dispersant in the ball milling process, the fluidity of the slurry is effectively improved, the stability of the slurry is enhanced, and the performance of the ball mill is improved, so that the prepared nano Silicon powder has good performance in sheeting, uniform particle size, and good dispersion structure; it greatly improves the electrochemical performance of the prepared silicon powder, which can effectively improve the electrochemical performance of silicon electrode materials and increase the specific capacity and capacity of the battery. The Coulomb effect improves the cycle performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a nano-silicon dispersion method. Background technique [0002] In the currently researched lithium-ion battery anode material system, metal alloy materials such as Si, Sn, Al, etc. can form polylithium alloys with Li and have a much higher theoretical specific capacity than traditional graphite anode materials. At the same time, this type of metal alloy Compared with traditional graphite anode materials, the lithium-deintercalation potential of such materials is higher, and lithium dendrites are less likely to be generated during rapid charge and discharge, and the safety performance is excellent. Among them, elemental silicon has the highest theoretical specific capacity of 4200mAh / g, lithium intercalation potential of 0.2V (vs. Li / Li+), good safety performance, abundant reserves, and high cost performance. In recent years, it has been favored by academ...

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
CPCB82Y30/00H01M4/362H01M4/386H01M4/62H01M10/0525Y02E60/10
Inventor 范珂铭
Owner 四川创能新能源材料有限公司
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