Method for in-situ growth of carbon nanotube array on metal current collector

A carbon nanotube array and in-situ growth technology, which is applied to structural parts, electrical components, battery electrodes, etc., can solve problems affecting electrical performance, etc., and achieve the effect of simple process, low equipment requirements, and good cycle stability

Active Publication Date: 2013-02-27
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

The main reason for this phenomenon is that the height of a single carbon nanotube in the carbon nanotube array grown by the floating catalyst method is much smaller than the array height, and most of the carbon nanotubes are not directly combined with the current collector, but through the gap between the carbon nanotubes. Contact each other for charge conduc

Method used

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  • Method for in-situ growth of carbon nanotube array on metal current collector
  • Method for in-situ growth of carbon nanotube array on metal current collector
  • Method for in-situ growth of carbon nanotube array on metal current collector

Examples

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Example Embodiment

[0039] Example 1

[0040] Using ultra-high vacuum electron beam evaporation system in 5.0×10 -8 Under the pressure of mbar, at room temperature and at a rate of 0.05nm / s, on a tantalum foil with a thickness of 20μm and a purity of 99.95%, aluminum oxide with a thickness of 30nm and iron with a thickness of 5nm are sequentially deposited to obtain an iron catalyst layer / alumina buffer layer / Metal tantalum foil three-layer structure; the substrate is placed in the central heating zone of the thermal CVD furnace, and the temperature is raised to 650°C at a heating rate of 10°C / min under the protection of argon gas, and then the argon gas is turned off and hydrogen gas is introduced ( Hydrogen flow rate is 50sccm, pressure is 0.5MPa) and pretreated for 8 minutes; then acetylene, hydrogen and argon are introduced at flow rates of 8sccm, 60sccm and 140sccm respectively, and the pressure in the furnace is increased to 5×10 under the above mixed atmosphere 5 Pa, the temperature is lowere...

Example Embodiment

[0046] Example 2

[0047] The "tantalum foil is replaced with a copper foil with a thickness of 20 μm and a purity of 99.95%" in Example 1, and the carbon nanotube array is prepared and the lithium ion half-cell is assembled according to the process described in Example 1.

[0048] Figure 8 SEM photo of the prepared carbon nanotube array, by Figure 8 It can be seen that the height of the prepared carbon nanotube array is about 200 μm, the diameter of a single carbon nanotube is about 10 nm, the wall is small, and each carbon nanotube is directly and firmly combined with the current collector.

[0049] In addition, the test shows that the prepared carbon nanotube array anode material has a reversible specific capacity as high as 3437.8mAh / g after 46 charge-discharge cycles under 0.13C low-speed charge and discharge conditions, and its specific capacity under 30C high-speed charge and discharge conditions It is still as high as 265mAh / g, and after 2480 cycles, it still has a specific...

Example Embodiment

[0050] Example 3

[0051] The carbon nanotube array and the assembling of the lithium ion half-cell were prepared according to the process described in Example 1. The difference from Example 1 is only that the thickness of the prepared iron catalyst layer is 1.2 nm.

[0052] It is found through testing that the height of the prepared carbon nanotube array is about 300μm, the diameter of a single carbon nanotube is about 6nm, and the bonding strength with the metal substrate is slightly poor; the negative electrode material of the carbon nanotube array is at 0.13C The reversible specific capacity is 2980.7mAh / g after 46 cycles of charge and discharge under low-speed charge-discharge conditions, and the specific capacity reaches 210mAh / g under high-speed charge-discharge conditions of 30C. After 2480 cycles, the reversible specific capacity is 0.13C. It still has a specific capacity of 2788.8mAh / g during charging and discharging at a high rate, and has good cycle stability.

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Abstract

The invention discloses a method for in-situ growth of a carbon nanotube array on a metal current collector. The method includes the steps: preparing a substrate with a catalyst layer, a buffer layer and a metal foil layer; and growing the carbon nanotube array on the substrate by a hot CVD (chemical vapor deposition) method. The height of the carbon nanotube array grown by the method can reach 80-300 micrometers, the diameter of the carbon nanotube array reaches 6-20 nanometers, the carbon nanotube array has fewer walls, and each carbon nanotube is directly and firmly combined with the current collector. From experiments, negative electrode materials of the prepared carbon nanotube array have high specific capacity and fine cyclic stability under low-speed and high-speed charge-discharge conditions. The method has the advantages of simple process, low equipment requirement and the like, and the prepared carbon nanotube array has a huge potential of serving as a support for loading other active materials for preparing high-performance composite electrode materials, and has a quite wide application prospect.

Description

technical field [0001] The invention relates to a method for growing a carbon nanotube array, in particular to a method for growing a carbon nanotube array in situ on a metal current collector, and belongs to the technical field of battery negative electrode material preparation. Background technique [0002] The rapid development of portable electronic products and electric vehicles has created a huge market demand for lithium-ion batteries with high capacity, high power, and high cycle performance. However, current lithium-ion batteries usually use graphitized carbon anode materials. Due to the limitation of specific capacity of 372mAh / g, the performance of the obtained battery is difficult to meet the application requirements. Carbon nanotubes, due to their excellent electrical properties, high specific surface area, and large aspect ratio, have received more and more attention as active materials in the research of lithium-ion electrode materials. [0003] At present, t...

Claims

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Application Information

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IPC IPC(8): H01M4/38
CPCY02E60/12Y02E60/10
Inventor 冷越董绍明胡建宝王震丁玉生何平高乐张翔宇
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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