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Method for synthesizing nano-silicon powder by using silicon tetrachloride as raw material and application of nano-silicon powder

A silicon nanopowder, silicon tetrachloride technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of expensive raw materials, lower reaction temperature, harsh reaction conditions, etc.

Inactive Publication Date: 2015-04-22
UNIV OF SCI & TECH OF CHINA
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  • Description
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Problems solved by technology

In the low-temperature molten salt system, the low-cost silicon source is used, the reaction temperature is further reduced, and no organic solvent is used, which solves the current problem of harsh reaction conditions and expensive raw materials for the preparation of silicon nanomaterials

Method used

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  • Method for synthesizing nano-silicon powder by using silicon tetrachloride as raw material and application of nano-silicon powder
  • Method for synthesizing nano-silicon powder by using silicon tetrachloride as raw material and application of nano-silicon powder
  • Method for synthesizing nano-silicon powder by using silicon tetrachloride as raw material and application of nano-silicon powder

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Embodiment Construction

[0016] The first aspect of the present invention provides a method for preparing silicon nano-powder by molten salt reaction. Under the condition of low-temperature molten salt, the silicon nano-powder is synthesized by reducing cheap silicon source with metal. The method adopts the reduction reaction participated by the molten salt to realize the macro-preparation of the silicon material.

[0017] In a preferred embodiment, the silicon source is industrial grade silicon tetrachloride.

[0018] In a preferred embodiment, the metal is selected from one or more of sodium metal, magnesium powder, aluminum powder, or their corresponding metal alloys.

[0019] In a preferred embodiment, the molten salt is selected from one or more of anhydrous aluminum chloride, anhydrous zinc chloride, anhydrous magnesium chloride, and anhydrous sodium chloride.

[0020] In a preferred embodiment, the reduction reaction temperature is 200°C-500°C; the reaction time is 5h-3 days, preferably 5-20h....

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Abstract

The invention relates to a method for synthesizing nano-silicon powder by using silicon tetrachloride as a raw material and an application of the nano-silicon powder. The invention belongs to the field of nano-silicon powder preparation and application and specifically relates to a technology for preparing high-performance nano-silicon powder in a molten salt system at low temperature by using silicon tetrachloride as a raw material. The prepared nano-silicon powder is used as a lithium ion battery cathode material.

Description

technical field [0001] The invention relates to the field of preparation and application of nano-silicon powder, in particular to a process for preparing high-performance silicon nano-powder at low temperature using silicon tetrachloride as a raw material in a molten salt system, and the prepared silicon nano-powder is used as a lithium-ion battery negative electrode Material. Background technique [0002] Based on the important application in functional electronic devices, the preparation of silicon nanomaterials has attracted extensive attention. At the same time, in the application of rechargeable and dischargeable lithium-ion batteries, silicon nanomaterials have a high theoretical capacity (~4200mAh g -1 ) and low discharge potential (<0.5V, Li / Li + ) is considered to be the best material to replace the traditional negative electrode. [0003] Traditionally, silicon materials are mainly prepared by solid-phase reduced silica. For example, carbothermal reduction o...

Claims

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Application Information

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IPC IPC(8): C01B33/033H01M4/134B82Y30/00
CPCY02E60/10
Inventor 钱逸泰朱永春林宁
Owner UNIV OF SCI & TECH OF CHINA
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