Silicon/aligned carbon nanotube composite negative electrode material for lithium ion battery and preparation method thereof

A technology of oriented carbon nanotubes and lithium-ion batteries, applied in battery electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problem that the structural skeleton is not easy to design and control, and limit the performance improvement of composite negative electrode materials Space, low performance of lithium-ion battery anode materials and other issues, to achieve excellent conductivity, fast lithium-ion mobility, and easy control

Active Publication Date: 2013-11-27
宁国市龙晟柔性储能材料科技有限公司
View PDF7 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Random carbon nanotubes cannot give full play to the excellent mechanical and electrical properties of a single carbon nanotube, and random distribution can easily lead to the agglomeration of carbon nanotubes and increase the contact resistance between carbon nanotubes, making the use of such composite materials The performance

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
  • Silicon/aligned carbon nanotube composite negative electrode material for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Catalyst layer deposited by electron beam evaporation process on silicon substrate with structure of Al 2 o 3 / Fe. Among them, Al 2 o 3 The thickness is 5 nm, and the Fe thickness is 1.2 nm. Using chemical vapor deposition method, ethylene is used as carbon source, hydrogen is used as reducing gas, and argon is used as carrier gas to synthesize aligned carbon nanotube arrays on silicon substrate with catalyst. The flow rate of ethylene was 90 sccm, the flow rate of argon gas was 400 sccm, the flow rate of hydrogen gas was 30 sccm, the growth temperature was 740 ℃, and the growth time was 10 min. From the array of aligned carbon nanotubes, the film can be directly drawn to obtain a monolayer of single-oriented carbon nanotubes, and 20 layers of aligned carbon nanotubes with a thickness of about 400 nm can be obtained by stacking 20 layers in sequence. Nano-silicon was prepared by electron beam evaporation with a deposition rate of 0.8 ? / s, and a 100 nm-thick nano-si...

Embodiment 2

[0030] Catalyst layer deposited by electron beam evaporation process on silicon substrate with structure of Al 2 o 3 / Fe. Among them, Al 2 o 3 The thickness is 5 nm, and the Fe thickness is 1.2 nm. Using chemical vapor deposition method, ethylene is used as carbon source, hydrogen is used as reducing gas, and argon is used as carrier gas to synthesize aligned carbon nanotube arrays on silicon substrate with catalyst. The flow rate of ethylene was 90 sccm, the flow rate of argon gas was 400 sccm, the flow rate of hydrogen gas was 30 sccm, the growth temperature was 740 ℃, and the growth time was 10 min. From the array of aligned carbon nanotubes, the film can be directly drawn to obtain a monolayer of single-oriented carbon nanotubes, and 8 layers of aligned carbon nanotubes with a thickness of about 160 nm can be obtained by stacking 8 layers in sequence. Nano-silicon was prepared by electron beam evaporation with a deposition rate of 0.8 ? / s, and a 100 nm-thick nano-sili...

Embodiment 3

[0032] Catalyst layer deposited by electron beam evaporation process on silicon substrate with structure of Al 2 o 3 / Fe. Among them, Al 2 o 3 The thickness is 5 nm, and the Fe thickness is 1.2 nm. Using chemical vapor deposition method, ethylene is used as carbon source, hydrogen is used as reducing gas, and argon is used as carrier gas to synthesize aligned carbon nanotube arrays on silicon substrate with catalyst. The flow rate of ethylene was 90 sccm, the flow rate of argon gas was 400 sccm, the flow rate of hydrogen gas was 30 sccm, the growth temperature was 740 ℃, and the growth time was 10 min. From the array of aligned carbon nanotubes, the film can be directly drawn to obtain a monolayer of single-oriented carbon nanotubes, and 8 layers of aligned carbon nanotubes with a thickness of about 160 nm can be obtained by stacking 8 layers in sequence. Nano-silicon was prepared by electron beam evaporation with a deposition rate of 0.8 ? / s, and a 400 nm-thick nano-sili...

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
Heightaaaaaaaaaa
Login to view more

Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a silicon/aligned carbon nanotube composite negative electrode material for a lithium ion battery and a preparation method thereof. The composite material consists of an aligned carbon nanotube film, nano-silicon uniformly distributed on the aligned carbon nanotube film and a vertically aligned nanotube array on the surface of nanosilicon. The bottom aligned carbon nanotube film provides a matrix with high strength and good flexibility to ensure the integrity of the electrode material in the battery circulating process. Silicon expansion is limited in a certain ranged due to the top aligned carbon nanotube array to prevent the silicon material from falling in the circulating process. Meanwhile, the material is porous, so that electrolyte can enter into the material so as to accelerate transmission of lithium ions. Therefore, the composite negative electrode material provided by the invention has the advantages of high capacity, good rate capability, long circulating service life and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a silicon-based composite material for negative electrodes of lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, small self-discharge, long cycle life and no memory effect, and are considered to be the most promising energy storage devices. At present, lithium-ion batteries have been widely used in consumer electronics products such as mobile phones, cameras, and ultrabooks, and in recent years, more and more researches and applications have been developed in electric vehicles and power storage devices. Improving power density, energy density and service life is the main direction of lithium-ion battery research and development at this stage and the main demands of meeting more applications. The performance of energy storage devices largel...

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): H01M4/36H01M4/134H01M4/1395B82Y30/00
CPCY02E60/122Y02E60/10
Inventor 彭慧胜翁巍林惠娟
Owner 宁国市龙晟柔性储能材料科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap