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A kind of porous silicon-copper composite material and its preparation method and application

A composite material and porous silicon technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of high energy consumption, unsuitability for large-scale industrial production, and high equipment requirements, and achieve large specific surface area, excellent performance, The effect of uniform pore size distribution

Active Publication Date: 2019-01-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The copper-silicon core-shell structure obtained by this method has regular morphology and uniform composition, and the cycle performance and rate performance of silicon have also been improved to a certain extent. However, the electroplating method requires high equipment and consumes a lot of energy, so it is not suitable for large-scale scale industrial production

Method used

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  • A kind of porous silicon-copper composite material and its preparation method and application
  • A kind of porous silicon-copper composite material and its preparation method and application
  • A kind of porous silicon-copper composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) CuO, Mg 2 Si is uniformly mixed in a mass ratio of 2:1.

[0032] 2) The homogeneously mixed raw materials are heat-treated at 600° C. for 10 h, and the heat treatment process is carried out under a protective atmosphere of argon.

[0033] 3) Treat the product obtained in step 2) in a certain concentration of hydrochloric acid for 5 hours, the concentration of hydrochloric acid is 0.2 mol / liter, after the acid treatment, use deionized water to wash 3 times, then centrifuge, and finally carry out vacuum drying.

[0034] The product prepared in this example is a porous silicon-copper composite material, and its morphology and structural characterization are as follows: figure 1 shown by figure 1 It can be seen that the particles of porous silicon-copper are about 2-10 μm, and countless nanoscale holes are evenly distributed on the surface and inside of the particles. The overall mass fraction of copper is 47.1%, which is mainly composed of elemental copper and the mol...

Embodiment 2

[0040] 1) CuO, Mg 2 Si is uniformly mixed in a mass ratio of 1:1.

[0041] 2) The homogeneously mixed raw materials were heat-treated at 650° C. for 9 hours, and the heat treatment process was carried out under the protective atmosphere of argon.

[0042] 3) The product obtained in step 2) was treated for 4 hours in a certain concentration of hydrochloric acid and hydrofluoric acid solution, the concentration of hydrochloric acid was 2.0 mol / liter, and then washed 4 times with deionized water, then centrifuged, and finally vacuum-dried.

[0043] The product obtained in this embodiment is a porous silicon-copper composite material, wherein about half of Cu and Si have formed a molecular formula of Cu 3 Copper-silicon alloy of Si, the overall mass fraction of copper is 34.6%.

[0044] The porous silicon-copper prepared in this example was made into a button battery for lithium battery performance testing, and compared with ordinary porous silicon to obtain a comparison chart o...

Embodiment 3

[0046] 1) CuO, Mg 2 Si is uniformly mixed in a mass ratio of 1:1.

[0047] 2) The homogeneously mixed raw materials were heat-treated at 700° C. for 8 hours, and the heat treatment process was carried out under the protective atmosphere of argon.

[0048] 3) The product obtained in step 2) was treated in a certain concentration of hydrochloric acid for 3 hours, and the concentration of hydrochloric acid was 5 mol / liter, and then washed 5 times with deionized water, then centrifuged, and finally vacuum-dried.

[0049] The product obtained in this embodiment is a porous silicon-copper composite material, wherein most of Cu and Si form a molecular formula of Cu 3 Copper-silicon alloy of Si, the overall mass fraction of copper is 35.8%.

[0050] The porous silicon-copper prepared in the above example was made into a button battery for lithium battery performance testing, and compared with ordinary porous silicon to obtain a comparison chart of cycle capacity curve and Coulombic ...

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Abstract

The invention discloses a method for preparing a porous silicon-copper composite material.The preparation method specifically comprises the steps that CuO powder and Mg2Si powder are mixed to be uniform to be subjected to heat treatment at the temperature of 600 DEG C-700 DEG C and then subjected to acid pickling and aftertreatment to obtain the porous silicon-copper composite material.According to the preparation method, the preparation technology is simple, the great operability is achieved, the adopted raw materials are rich in source and low in price, and the adopted method way is easily conducted in a factory; particularly, a replacement reaction of magnesium and copper oxide is ingeniously utilized, nano-scale copper particles are generated and uniformly dispersed on the surface of porous silicon while porous silicon is prepared, and the improvement role of copper on the conductivity of a whole material system and the buffer role of the copper particles on the size changes of silicon during extraction and insertion of lithium ions are more fully played.Through the potential method, the silicon-copper composite material with a unique structure can be massively synthesized.

Description

technical field [0001] The invention belongs to the field of preparation of composite materials, and in particular relates to a porous silicon-copper composite material and its preparation method and application. Background technique [0002] Lithium-ion battery, referred to as lithium battery, is a reversible secondary battery that utilizes the insertion and extraction of lithium ions in positive and negative electrode materials to realize charging and discharging. Because of its high capacity, high voltage platform and long cycle life, it is widely used in various electronic products, hybrid vehicles and electric vehicles. As an efficient and clean energy storage method, lithium-ion batteries still have great application development space in the future. [0003] At present, the commercial lithium-ion battery anode materials mainly use carbon materials represented by graphite. As a negative electrode material for lithium-ion batteries, graphite has only a theoretical spec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M10/0525
CPCH01M4/364H01M4/386H01M10/0525Y02E60/10
Inventor 杜宁张亚光张辉杨德仁
Owner ZHEJIANG UNIV
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