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Three-dimensional porous copper-silicon-carbon composite integrated electrode and preparation method thereof

A three-dimensional porous, carbon composite technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of destruction, capacity decline, active material crushing and pulverized electrode structure, so as to prevent pulverization and crushing and improve stability , the effect of good toughness

Active Publication Date: 2018-11-13
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon undergoes a large volume expansion (328%) during the charge-discharge process, which causes the crushing and pulverization of the active material and the destruction of the electrode structure, which eventually leads to a rapid decline in capacity, so the severe volume expansion limits its practical application. application

Method used

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  • Three-dimensional porous copper-silicon-carbon composite integrated electrode and preparation method thereof
  • Three-dimensional porous copper-silicon-carbon composite integrated electrode and preparation method thereof
  • Three-dimensional porous copper-silicon-carbon composite integrated electrode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] The preparation method of the copper-silicon-carbon integrated electrode specifically provided in this example includes the following steps:

[0020] 1) Preparation of copper-silicon alloy: dry copper powder and silicon powder in a vacuum drying oven in advance, and dry at 60° C. for 12 hours. Weigh copper and silicon according to the volume ratio of 3:1, weigh 23g and 2g of copper and silicon respectively, and pour them into the ball milling tank, then weigh 250g of ball milling beads according to the material ratio of 10:1 and pour them into the ball milling tank, and pour an appropriate amount Alcohol is used to submerge the ball milling beads, and then the copper-silicon alloy can be obtained after ball milling on a ball mill for 50 hours.

[0021] 2) Preparation of three-dimensional porous copper-silicon film precursor: place the copper-silicon alloy prepared in step 1) in a vacuum drying oven at 60°C for 12 hours, then weigh 1 g of copper-silicon alloy powder and ...

Embodiment 2

[0026] The difference from Example 1 is that in the above step 4), the prepared three-dimensional porous copper-silicon film is placed in a crucible, and after the temperature rises to 600°C at a rate of 10°C / min under an argon atmosphere, and at the highest The temperature was kept for 30 minutes. When the temperature reached 600°C, 6sccm acetylene and 100sccm hydrogen were introduced, and the furnace was removed after 10 minutes to obtain a three-dimensional porous copper-silicon-carbon composite integrated electrode. Compared with Example 1, the gas flow rate of control acetylene is constant while increasing the heat preservation time when feeding gas so as to control the growth of carbon nanotubes, as image 3 The scanning electron microscope image of the copper-silicon-carbon integrated electrode shown, it can be seen from the image that there are many carbon nanotubes formed on the surface, the length is relatively uniform, and the growth is in the form of bundles.

Embodiment 3

[0028] The difference from Example 1 is that in the above step 4), the prepared three-dimensional porous copper-silicon film is placed in a crucible, and after the temperature rises to 600°C at a rate of 10°C / min under an argon atmosphere, and at the highest The temperature was kept for 30 minutes. When the temperature reached 600°C, 6sccm acetylene and 100sccm hydrogen were introduced, and the furnace was removed after 15 minutes to obtain a three-dimensional porous copper-silicon-carbon composite integrated electrode. Compared with embodiment 1, 2, continue to keep the gas flow rate of acetylene constant, continue to increase the heat preservation time when feeding gas to control the growth of carbon nanotubes, as Figure 4 The scanning electron microscope image of the copper-silicon-carbon integrated electrode is shown. It can be seen from the figure that a large number of carbon nanotubes are formed on its surface, and the generated carbon nanotubes are in a three-dimension...

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Abstract

The invention discloses a three-dimensional porous copper-silicon-carbon composite integrated electrode and a preparation method thereof. The preparation method comprises the following steps: preparing a copper silicon alloy from copper and silicon through a simple ball milling method, preparing a precursor through a nonsolvent-induced phase separation method combined with an organic film, preparing a three-dimensional porous copper-silicon film with certain toughness and mechanical strength through a solid phase sintering method of powder metallurgy, growing graphene and carbon nanotubes through a chemical vapor deposition method, and controlling the growth of graphene and carbon nanotubes by controlling temperature, gas intake time and an acetylene flow rate, so as to finally prepare thecopper-silicon-carbon composite integrated electrode. The three-dimensional porous structure can provide sufficient space for the volume expansion of silicon during the cycle process, and the graphene and carbon nanotubes with large specific surface area can form a stable SEI film, so as to prevent the pulverization and crushing of an electrode material, and finally maintain a stable electrochemical cycle. The three-dimensional porous copper-silicon-carbon composite integrated electrode and the preparation method thereof have wide practical application.

Description

technical field [0001] The invention belongs to the technical field of research, development and application of three-dimensional porous electrode materials, and in particular relates to a three-dimensional porous copper-silicon-carbon composite integrated electrode, and also relates to a method for preparing the electrode. Background technique [0002] At the current stage, lithium-ion batteries are widely used in various portable electronic devices due to their advantages over other energy storage devices, such as high-quality specific capacity and volume specific capacity. Graphite used in current commercial lithium-ion batteries is a traditional negative electrode material, which has only about 10% volume expansion during charge and discharge, but its theoretical specific capacity is low, only 372mAh g -1 , due to the increasing demand for energy storage technology, there is an urgent need to develop electrode materials with high specific capacity. [0003] Many new ano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/386H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 康建立关新新王知常张志佳
Owner TIANJIN POLYTECHNIC UNIV
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