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Egg yolk-egg shell structure type microsphere and preparation method thereof

A technology of microspheres and eggshells, applied in structural parts, electrical components, electrochemical generators, etc., can solve the problems of difficulty in controlling the volume of the empty layer, not meeting the needs of industrialization, and large environmental hazards, and achieving a regular structure and environmental hazards. Small, simple and easy to implement

Active Publication Date: 2019-10-18
云南三磷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of etching the template with strong acid and strong alkali is more complicated and harmful to the environment, and it is difficult to control the volume of the empty layer
In addition, the carbon source of the outermost carbon shell is mostly deposited by dopamine carbonization and CVD, both of which are relatively expensive and do not meet the needs of industrialization.

Method used

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  • Egg yolk-egg shell structure type microsphere and preparation method thereof
  • Egg yolk-egg shell structure type microsphere and preparation method thereof
  • Egg yolk-egg shell structure type microsphere and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Example 1 (see figure 1 ):

[0054] (1) Preparation of silicon powder / naphthalene spherical mixture: silicon powder and naphthalene sheets are heated and stirred in a constant temperature water bath in a mass ratio of 1:2 until the naphthalene is completely melted to obtain a mixed dispersion, and the mixed dispersion is placed in a melting granulation device and heated to After cooling at 95°C, spraying is carried out to obtain a silicon powder / naphthalene spherical mixture.

[0055] (2) Prepare silicon powder / naphthalene / mixed dry powder: mix nano-graphite flakes, phenolic resin, and deionized water according to a mass ratio of 10:8:75 and sand mill them for 30 minutes, and dry to obtain nano-graphite flakes with a particle size of 200-300nm and Thermosetting phenolic resin mixed dry powder, according to the mass ratio of mixed dry powder and silicon powder / naphthalene spherical mixture of 1:20 by electrostatic dry powder coating method, the mixed dry powder is evenl...

Embodiment 2- Embodiment 7

[0059] The specific preparation process parameters and conditions of Example 2-Example 7 are shown in Table 1. Finally, a series of egg yolk-eggshell structure negative electrode material powder@graphite microspheres with firm, complete shells and regular structures without collapse can be obtained, which can be used as electrode negative electrodes Material.

[0060] Table 1

[0061]

[0062]

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Abstract

The invention discloses an egg yolk-egg shell structure type microsphere and a preparation method thereof. The preparation method comprises the following steps: preparing a mixed dispersion material of powder and molten naphthalene, wherein a mass ratio of the powder to the naphthalene in the mixed dispersion material is 1 : (2-5); treating the mixed dispersion material by adopting a melt granulation device to obtain a powder / naphthalene spherical mixture; preparing a mixed material of a nano-graphite flake and an organic binder, and wrapping the surface of the powder / naphthalene spherical mixture with the mixed material to obtain a powder / naphthalene / mixed material microsphere, wherein a mixed material and a powder body wherein a mass ratio of the mixed material to the powder / naphthalenespherical mixture is 1 : (10-70); and carrying out low-temperature heating treatment on the powder / naphthalene / mixed material microsphere to remove a naphthalene layer to obtain an egg yolk-egg shellstructure type powder@mixed material microsphere, and carrying out high-temperature carbonization treatment on the powder@mixed material microsphere to obtain an egg yolk-egg shell structure type powder@graphite microsphere. The invention provides a preparation method of an egg yolk-egg shell structure type nuclear@graphite microsphere which is corrosion-free, simple, cheap and environment-friendly, and can be prepared on a large scale.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to an egg yolk-eggshell structure microsphere and a preparation method thereof. Background technique [0002] Egg yolk-eggshell structure (core@shell) composites are an important class of advanced materials. Due to their unique structure and properties of core / void / shell, they have received widespread attention, making them important in many fields. The application value, such as drug delivery, lithium-ion batteries, nanoreactors and catalysis. For example, in the field of lithium batteries, the cavity inside the yolk-eggshell particles not only prevents the aggregation of electroactive particles inside, but also provides a unique space for coordinating the huge volume change of the particles during the charge / discharge cycle. At present, the methods for preparing egg yolk-eggshell structural materials include template method, Ostwald ripening method, and K...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525
CPCH01M4/366H01M4/386H01M4/583H01M10/0525Y02E60/10
Inventor 曹宏李梓烨薛俊安子博袁密郑雨佳
Owner 云南三磷科技有限公司
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