Silicon/oxidative silicon nuclear-shell structured nano-composite material, its preparation and use

A technology of nanocomposite materials and core-shell structure, applied in the field of electrochemistry, can solve problems such as unsatisfactory long-term cycle performance and loss of nanoparticles

Inactive Publication Date: 2007-01-17
FUDAN UNIV
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Problems solved by technology

However, because nanoparticles are prone to agglomeration, the unique effect of nano

Method used

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  • Silicon/oxidative silicon nuclear-shell structured nano-composite material, its preparation and use
  • Silicon/oxidative silicon nuclear-shell structured nano-composite material, its preparation and use

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Embodiment Construction

[0016] In the preparation method of the silicon / silicon oxide core-shell nanocomposite material of the present invention, step 1) involves the preparation process of the solution. The organic orthosilicate and the organic solvent used in this step can be industrial grade or reagent pure. From a cost point of view, industrial grade is preferred. Organic orthosilicates include ethyl orthosilicate, propyl orthosilicate, n-butyl orthosilicate and other orthosilicates, preferably ethyl orthosilicate. The amount of organoorthosilicate is 0.8ml-8ml, preferably 1.6-4ml, per gram of nano-silicon in step (2). The organic solvent can be alcohols such as ethanol, propanol, or other volatile organic solvents; as the organic solvent of the organic orthosilicate, the volume ratio of the organic orthosilicate to the organic orthosilicate is 10:1-1: 1, preferably 5:1-1:1, more preferably 2:1; the volume ratio of deionized water and organic orthosilicate is 5:1-1:1, preferably 3:1-1:1, more p...

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Abstract

A silicon/monox core-shell structured nanometer-composite material, its production and use are disclosed. The process is carried out by building in and removing lithium ion by sol-gel method. Its advantages include stable crystal structure, better reversible capacity and circulation performance, better operability, repeatability and quality. It can be used in production of lithium-ion battery.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a method for preparing a silicon / silicon oxide core-shell nanocomposite material, more specifically, the invention relates to a method for preparing nano-silicon as the core by a sol-gel method, and silicon oxide A method for shell nanocomposites. The present invention also relates to the silicon / silicon oxide core-shell nanocomposite material obtained by the above method. At the same time, the invention also relates to the application of the nanocomposite material, that is, as a lithium ion battery negative electrode material. 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 ...

Claims

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Application Information

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IPC IPC(8): C01B33/00B22F1/02B82B3/00H01M4/04H01M4/36
CPCY02E60/12Y02E60/10
Inventor 张涛高杰付丽君吴宇平吴浩青
Owner FUDAN UNIV
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