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Preparation method of Sn-Si alloy-type nano-composite powder

A nano-composite and alloy-type technology, which is applied in the field of nano-materials and new functional materials preparation, can solve the problems of low cost, high output and size controllable, and achieve strong controllability of technical parameters, simple process route, and process flow. short effect

Active Publication Date: 2016-06-29
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing methods for the development of nano-Si and Sn particle materials are still unable to achieve low cost, high yield, and controllable size, and there is no report of one-step preparation of Sn-Si alloy nanocomposite powder at home and abroad.

Method used

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  • Preparation method of Sn-Si alloy-type nano-composite powder
  • Preparation method of Sn-Si alloy-type nano-composite powder
  • Preparation method of Sn-Si alloy-type nano-composite powder

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Effect test

Embodiment 1

[0023] (1) First, make the ratio according to the stoichiometric ratio Sn:Si=0.34:0.66, and adjust the power in the high vacuum suspension smelting furnace to melt the Sn block (lower melting point and high gasification temperature) and gradually increase the power , The corresponding power range is 6-10kW, which melts the Si block. After the whole is liquefied, it is suspended for 2 minutes and then cooled.

[0024] (2) The prepared alloy ingot is used as the anode, and when the volume ratio of hydrogen to inert gas is 1:1, a high-intensity arc is formed by discharge, the arcing current is 250A, the arc voltage is 30V, evaporation and condensation Sn-Si particles are then formed. The whole process lasts for 40 minutes, the powder output is nearly 50%, and the Sn-Si material with a large amount of Si remains in the anode.

Embodiment 2

[0026] (1) First, make the ratio according to the stoichiometric ratio Sn:Si=0.3:0.7, and adjust the power in the high vacuum suspension melting furnace to melt the Sn block (lower melting point and high gasification temperature) and gradually increase the power , The corresponding power range is 6 ~ 11kW, so that the Si block melts. After the whole is liquefied, it is suspended for 2 minutes and then cooled.

[0027] (2) The prepared alloy ingot is used as the anode, and when the volume ratio of hydrogen to inert gas is 1:1, a high-intensity arc is formed through discharge, the arcing current is 100A, the arc voltage is 15V, evaporation and condensation Sn-Si particles are then formed. The entire process lasts for 40 minutes, the powder output is nearly 40%, and the Sn-Si material with a large amount of Si remains in the anode.

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Abstract

The invention provides a preparation method of Sn-Si alloy-type nano-composite powder, and belongs to the field of novel functional materials. The method comprises the following steps: firstly, carrying out mass proportioning on high-purity Sn and high-purity Si blocks at a certain stoichiometric ratio; carrying out smelting in a vacuum induction melting furnace to obtain an Sn-Si alloy block material; and carrying out electric arc evaporation on the obtained block material in an inert gas environment to prepare the Sn-Si alloy-type nano-composite powder. The average particle sizes of the Sn-Si alloy-type nano-composite powder particles obtained by the method are in nanoscale; and the method is simple and feasible in process route, short in synthesis period and high in controllability of technical parameters.

Description

Technical field [0001] The invention relates to a preparation method of Sn-Si alloy type nano composite powder, which belongs to the technical field of preparation of nano materials and new functional materials. Background technique [0002] Lithium-ion batteries have become common products in people's daily life due to their high capacity, long cycle life, and environmental friendliness. As the application field of lithium batteries develops from small portable electronic devices to electric vehicles, aerospace, large military equipment and other markets, people have put forward higher requirements for the performance of lithium batteries. Lithium-ion batteries are mainly composed of cathode, anode, electrolyte, diaphragm and so on. The negative electrode material, as one of the key electrode materials of lithium-ion batteries, directly affects its performance and can become a bottleneck restricting its large-scale promotion and application. Therefore, the design and developme...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M10/0525B82Y40/00
CPCB82Y40/00H01M4/364H01M4/386H01M10/0525Y02E60/10
Inventor 宋晓艳李昱嵘侯超王海滨刘雪梅张亚娟刘东
Owner BEIJING UNIV OF TECH
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