Carbon nanotube / silicon three-dimensional composite material and preparation method and application thereof

By performing surface chemical state regulation and vapor deposition processes on the surface of spherical silicon powder, combined with the composite activator system and multi-stage heat treatment process, the orderly growth of carbon nanotubes is achieved, solving the problems of unstable growth and random orientation in the prior art, and significantly improving the structural stability and electrochemical properties of the composite material.

CN119774617APending Publication Date: 2025-04-08CHINA UNIV OF PETROLEUM (BEIJING)
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Patent Information

Application Number
CN202510084467.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-20
Publication Date
2025-04-08

AI Technical Summary

Technical Problem

In the prior art, the preparation method of silicon/carbon nanotube composite material is difficult to achieve the controllable growth of carbon nanotubes on the surface of silicon powder, especially the precise construction of catalytic centers and the regulation of growth orientation, resulting in low interface bonding strength and unstable structural structure.

Method used

Through surface chemical state regulation and vapor deposition processes, a three-dimensional structural silicon carbon anode material is constructed on the surface of spherical silicon powder, and the orderly growth of carbon nanotubes is achieved by using a composite activator system and a multi-stage heat treatment process to form a unique three-dimensional network structure.

Benefits of technology

The controlled growth of carbon nanotubes on the surface of silicon powder is achieved, the interface bonding strength and structural stability are improved, and the electrochemical performance and cyclic stability of composite materials are significantly improved.

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Abstract

The invention provides a carbon nanotube / silicon three-dimensional composite material and a preparation method and application thereof.The preparation method comprises the steps that spherical silicon powder is dispersed in a solution containing an alkaline activator, then a zwitterionic surfactant solution and a silane coupling agent are sequentially added, ultrasonic treatment is conducted, and active spherical silicon powder is obtained; the method comprises the following steps: dispersing active spherical silicon powder in an alcoholic solution of transition metal salt and rare earth metal salt, and then carrying out heat treatment on the obtained mixed solution by adopting a three-stage heat treatment process so as to load a core-shell structure nano catalyst on the surface of the active spherical silicon powder, and putting the product obtained in the previous step into a tubular furnace, introducing inert gas and carbon source gas into the tubular furnace in a pulse type atmosphere switching mode, then introducing an oxygen-containing organic matter, and carrying out a reaction so as to realize radial arrangement and growth of the carbon nanotubes, thereby obtaining the carbon nanotube / silicon three-dimensional composite material. The carbon nanotube / silicon three-dimensional composite material disclosed by the invention shows excellent structural stability and excellent electrical properties.
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