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Carbon material and nano silicon composite materials and method for preparing same and use thereof

A technology of composite materials and carbon materials, applied in chemical instruments and methods, silicon, fibrous fillers, etc.

Inactive Publication Date: 2006-12-27
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Obviously, its capacity needs to be further improved

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  • Carbon material and nano silicon composite materials and method for preparing same and use thereof
  • Carbon material and nano silicon composite materials and method for preparing same and use thereof

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Embodiment Construction

[0015] In the carbon material / nano-silicon composite material preparation method of the present invention, the carbon material in step (1) is artificial graphite, natural graphite or low-temperature amorphous carbon, and the average particle size of the carbon material is 0.01-1000 microns.

[0016] In the carbon material / nano-silicon composite material preparation method of the present invention, step (1) involves ultrasonic dispersion of nano-silicon. The nano-silicon used in this step can be industrial-grade nano-silicon or high-purity silicon. In terms of cost, industrial grade nano silicon is preferred. The particle size of nano-silicon is within the range of 1 nm-500 nm, preferably 5 nm-200 nm, more preferably 10 nm-100 nm. The shape of nano-silicon can be nanosphere, nanowire, nanorod, nanofiber, nanotube, etc., preferably nanosphere. The particle size of the carbon material used in this step is preferably 0.1 micron to 20 micron, more preferably 2 micron to 15 micron...

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Abstract

The invention discloses a preparing method of carbon material or nanometer silicon composite material and material through composite sintering method in the electrochemical technological domain, which is characterized the following: possessing stable structure with even particle diameter less than 1 mm; avoiding agglomeration among large amount of nanometer particles due to stronger action of surface to surface; displaying high reversible capacity and excellent circulating property.

Description

technical field [0001] The invention belongs to the field of electrochemical technology, and specifically relates to a method for preparing carbon material / nano-silicon composite material. Nanocomposite methods for cladding. The present invention also relates to the application of the carbon material / nano-silicon composite material obtained by the above method, that is, as the negative electrode material of the lithium ion battery. Background technique [0002] As we all know, silicon, as a promising anode material for lithium-ion batteries, has attracted more and more attention in the industry. The main reason is that the cut-off potential of lithium insertion into silicon can not only be controlled above 0.2V, but also the reversible insertion of lithium into silicon Large, the theoretical insertion capacity reaches 4000mAh / g, which can significantly improve the capacity and safety performance of the battery. However, during the insertion and deintercalation process of l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C01B33/02H01M4/36C09C3/06
CPCY02E60/12Y02E60/10
Inventor 张涛付丽君吴宇平吴浩青
Owner FUDAN UNIV
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