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Carbon nanotube/silicon/graphene composite material, preparation method thereof and lithium ion battery

A silicon composite material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of large volume change and shorten the life of lithium-ion batteries, and achieve simple equipment, excellent energy storage performance and cycle performance , Easy to operate and feasible effect

Inactive Publication Date: 2014-09-24
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem with silicon as a negative electrode material, that is, the volume of silicon changes greatly during the process of intercalation and delithiation, which will lead to powdering of the electrode material, making the energy storage capacity of lithium-ion batteries decline rapidly with the increase in the number of cycles. So as to shorten the life of lithium-ion batteries, this is an important problem to be solved before the application of silicon materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Ultrasonic cleaning of the substrate copper foil with deionized water, ethanol, and acetone and drying, then putting the substrate copper foil into the reaction chamber, passing nitrogen gas to form a nitrogen atmosphere in the reactor, using a mechanical pump , Roots pump and molecular pump to pump pressure step by step, pumping the pressure in the reaction chamber to 10 -3 Below Pa, keep it for 1 minute, stop feeding nitrogen and stop pumping;

[0035] 2. Heat the substrate copper foil to 500°C, then feed methane with a flow rate of 50ml / min into the reaction chamber, keep the temperature constant, and stop feeding methane after 1 minute of reaction to obtain carbon nanotube materials;

[0036] 3. Then, feed silicon tetrahydrogen at a flow rate of 50ml / min into the reaction chamber, keep it for 1 minute, stop heating the substrate copper foil and cool it to room temperature to obtain a carbon nanotube / silicon composite material;

[0037] 4. Take out the carbon nan...

Embodiment 2

[0039] 1. Clean the substrate iron foil with deionized water, ethanol, and acetone ultrasonically and dry it, then put the substrate iron foil into the reaction chamber, and inject helium gas to form a helium gas atmosphere in the reactor. Mechanical pumps, Roots pumps and molecular pumps carry out step-by-step pumping to pump the pressure in the reaction chamber to 10 -3 Below Pa, keep it for 12 minutes, stop feeding helium and stop pumping;

[0040] 2. Heat the substrate iron foil to 800°C, then feed ethane with a flow rate of 100ml / min into the reaction chamber, keep the temperature constant, and stop feeding ethane after 30 minutes of reaction to obtain carbon nanotube materials;

[0041] 3. Then feed silicon tetrahydrogen with a flow rate of 100ml / min into the reaction chamber, keep it for 30 minutes, stop heating the substrate iron foil and cool it to room temperature to obtain a carbon nanotube / silicon composite material;

[0042] 4. Take out the carbon nanotube / silicon ...

Embodiment 3

[0044] 1. Clean the substrate iron foil with deionized water, ethanol and acetone ultrasonically and then dry it, then put the substrate iron foil into the reaction chamber, and pass in argon gas to form an argon atmosphere in the reactor. Mechanical pumps, Roots pumps and molecular pumps carry out step-by-step pumping to pump the pressure in the reaction chamber to 10 -3 Below Pa, keep it for 15 minutes, stop feeding argon and stop pumping;

[0045] 2. Heat the substrate iron foil to 1000°C, then feed ethylene with a flow rate of 200ml / min into the reaction chamber, keep the temperature constant, and stop feeding ethylene after reacting for 1 to 300 minutes to obtain carbon nanotube materials;

[0046] 3. Then feed silicon tetrahydrogen with a flow rate of 200ml / min into the reaction chamber, keep it for 100 minutes, stop heating the substrate iron foil and cool it to room temperature to obtain a carbon nanotube / silicon composite material;

[0047] 4. Take out the carbon nan...

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PUM

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Abstract

The invention relates to a carbon nanotube / silicon / graphene composite material and a preparation method, the method comprises the following steps: heating a substrate to 500-1300 DEG C, then introducing carbon source in a gaseous state into a reaction chamber, keeping temperature, reacting for 1-300 minutes, stopping the introduction of the carbon source in the gaseous state to obtain the carbon nanotube material; then introducing a silicon source in the gaseous state in the reaction chamber, keeping for 1-300 minutes, stopping heating of the substrate and cooling to room temperature to obtain the carbon nanotube / silicon composite material; taking the carbon nanotube / silicon composite material, placing graphene and the carbon nanotube / silicon composite material in absolute ethyl alcohol for ultrasonic reaction, then filtering and drying to obtain the carbon nanotube / silicon / graphene composite material. In the carbon nanotube / silicon / graphene composite material, the prepared silicon carbon composite material is used for a cathode material of a lithium ion battery, and has excellent energy storage performance and cycle performance.

Description

technical field [0001] The invention relates to the field of preparation of chemical materials, in particular to a carbon nanotube / silicon / graphene composite material and a preparation method thereof. The invention also relates to the application of the silicon-carbon composite material in lithium ion batteries. Background technique [0002] As a new type of energy storage device, lithium-ion batteries are being researched by many scientific research institutions and enterprises at home and abroad. With the development of various electronic products, the performance of lithium-ion batteries is increasingly unable to meet the needs of various power-consuming products. At present, graphite is mainly used as the negative electrode material of lithium-ion batteries, and the theoretical capacity of graphite is only 372mAh / g, which greatly limits the performance of lithium-ion batteries. [0003] Recently, researchers have discovered that silicon, as an anode material, has a hig...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M10/0525
CPCY02E60/122H01M4/362H01M4/386H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 周明杰钟辉王要兵袁新生
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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