Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF3 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 conduction; another important reason is that when the floating catalyst method grows large-height carbon nanotubes, it needs to continuously supply catalysts, resulting in a large amount of catalyst impurities in the carbon nanotubes and the resulting bamboo-shaped graphite caps. (Advanced Materials, Vol.19:2360-2363(2007).), thus affecting its electrical properties

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Using ultra-high vacuum electron beam evaporation system at 5.0×10 -8 Under the pressure of mbar, aluminum oxide with a thickness of 30nm and iron with a thickness of 5nm are sequentially deposited on a tantalum foil with a thickness of 20μm and a purity of 99.95% at a rate of 0.05nm / s at room temperature to obtain an iron catalyst layer / alumina buffer layer / A substrate with a three-layer structure of metal tantalum foil; the substrate is placed in the central heating zone of a thermal CVD furnace, and the temperature is raised to 650°C at a rate of 10°C / min under the protection of argon, then the argon is closed, and hydrogen is introduced ( The hydrogen flow rate is 50sccm, the pressure is 0.5MPa) and pretreatment for 8 minutes; then acetylene, hydrogen and argon are introduced at the flow rates of 8sccm, 60sccm and 140sccm respectively, and the pressure in the furnace is raised to 5×10 under the above mixed atmosphere. 5 Pa, keeping the temperature for 1 hour and co...

Embodiment 2

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

[0048] Figure 8 SEM photographs of the as-prepared carbon nanotube arrays, obtained by Figure 8 It can be seen that the prepared carbon nanotube array has a height of about 200 μm, a single carbon nanotube has a diameter of about 10 nm, has few walls, and each carbon nanotube is directly and firmly combined with the current collector.

[0049] In addition, it was found that the reversible specific capacity of the prepared carbon nanotube array negative electrode material was as high as 3437.8mAh / g after 46 charge-discharge cycles under the low-speed charge-discharge condition of 0.13C, and the specific capacity under the high-speed charge-discharge condition of 30C It is still as high as 265mAh / g, and after 2480 cycles, it still has a sp...

Embodiment 3

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

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com