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Silicon nanotube composite negative electrode material used for lithium battery and preparation method

A nanotube composite and negative electrode material technology, which is applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc., can solve the problems of large volume change and low charge and discharge efficiency, and achieve high reversible specific capacity, Coulombic efficiency is improved, and the effect of thermal diffusion is improved

Active Publication Date: 2018-03-30
湖北冠毓新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the disadvantages of large volume change and low charge and discharge efficiency of lithium battery negative electrode materials in the current prior art, the purpose of the present invention is to provide a silicon nanotube composite negative electrode material for lithium batteries and a preparation method thereof. Increase the Li ion intercalation channel, refine the crystal grains at the same time, reduce the side reactions during the Li ion intercalation process, thereby improving the negative electrode Coulombic efficiency

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  • Silicon nanotube composite negative electrode material used for lithium battery and preparation method

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Embodiment 1

[0030] A preparation method for a silicon nanotube composite negative electrode material for a lithium battery, the steps are as follows:

[0031] (1) Clean and dry the single crystal silicon wafer substrate, and sputter a layer of gold film with a thickness of 3nm on the surface of the silicon wafer by ion sputtering as a catalyst to provide nucleation sites for the growth of silicon dioxide nanotubes Put the corundum boat carrying the zinc sulfide powder and the silicon substrate into the horizontal tube furnace so that the zinc sulfide is located at the center of the high temperature zone of the horizontal tube furnace, the silicon substrate is at the position 15 cm downstream of the zinc sulfide, and the tube furnace is sealed. Introduce a high-purity inert gas as a carrier gas to flush out the residual air in the growth chamber; control the flow rate of the inert gas at 150 sccm, keep the pressure in the growth chamber at 500 Pa, raise the temperature of the tube furnace t...

Embodiment 2

[0036] A preparation method for a silicon nanotube composite negative electrode material for a lithium battery, the steps are as follows:

[0037] (1) Clean and dry the single crystal silicon wafer substrate, and sputter a layer of gold film with a thickness of 5nm on the surface of the silicon wafer by ion sputtering as a catalyst to provide nucleation sites for the growth of silicon dioxide nanotubes; Put the corundum boat carrying zinc sulfide powder and silicon substrate into the horizontal tube furnace, so that the zinc sulfide is located in the center of the high temperature zone of the horizontal tube furnace, and the silicon substrate is located 20 cm downstream of the zinc sulfide, seal the tube furnace, and pass Inject a high-purity inert gas as a carrier gas to flush out the residual air in the growth chamber; control the flow rate of the inert gas at 200 sccm, keep the pressure in the growth chamber at 800 Pa, raise the temperature of the tube furnace to the synthes...

Embodiment 3

[0042] A preparation method for a silicon nanotube composite negative electrode material for a lithium battery, the steps are as follows:

[0043] (1) Clean and dry the single crystal silicon wafer substrate, use an ion sputtering instrument to sputter a layer of gold film with a thickness of 6nm on the surface of the silicon wafer as a catalyst to provide nucleation sites for the growth of silicon dioxide nanotubes Put the corundum boat carrying the zinc sulfide powder and the silicon substrate into the horizontal tube furnace so that the zinc sulfide is located at the center of the high temperature zone of the horizontal tube furnace, the silicon substrate is at the position 10 cm downstream of the zinc sulfide, and the tube furnace is sealed. Introduce a high-purity inert gas as a carrier gas to wash away the residual air in the growth chamber; control the flow rate of the inert gas at 30sccm, keep the pressure in the growth chamber at 80Pa, raise the temperature of the tube...

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Abstract

The invention relates to the technical field of a lithium battery, and particularly relates to a silicon nanotube composite negative electrode material used for a lithium battery and a preparation method. The silicon nanotube composite negative electrode material used for the lithium battery consists of a substrate and composite nanotubes vertically arranged on the substrate; and the composite nanotubes consist of silicon nanotubes, a titanium dioxide thin film and an amorphous form carbon layer from inside to outside in sequence. According to the silicon nanotube composite negative electrodematerial used for the lithium battery provided by the invention, in a charging-discharging process, the lateral volume effect in the Li de-intercalation process is relatively low, Li de-intercalationcan be quicker and more complete, the reversible specific capacity can be higher, a more stable SEI film can be formed, and the material coulombic efficiency can be improved; by virtue of a titanium oxide coating layer, volume change can be further suppressed, the service life and safety of the material can be prolonged and improved; and by virtue of C coating layer, the gram volume and electricalconductivity of the material can be improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a silicon nanotube composite negative electrode material for lithium batteries and a preparation method. Background technique [0002] The global new energy automobile industry will show a trend of rapid industrialization under the background of continuous maturity of technology and continuous implementation of government support policies. In addition, industries such as electric tools, electric bicycles, and new energy will also maintain a low-carbon economy. momentum of rapid development. With the rapid development of wind power and photovoltaic power stations and smart grids, there is an urgent need for efficient and clean large-scale power storage technology. New secondary batteries have received great attention from the power system, requiring extensive resources, high cost performance, environmental friendliness, long life, easy to maintain. Therefore, high-perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/485H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 陈庆廖健淞
Owner 湖北冠毓新材料科技有限公司
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