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Carbon nanotube-filled silicon/hollow carbon composite negative electrode material and preparation method thereof

A technology of carbon nanotubes and anode materials, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of limiting the uniformity of composite materials, low compaction density electron transport paths of composite materials, carbon Problems such as poor dispersion of nanotubes, to achieve the effect of accelerating electron transmission path and transmission rate, excellent electrochemical performance, and easy large-scale production

Active Publication Date: 2019-04-05
湖南宸宇富基新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the commonly used method is to mix silicon with existing carbon nanotubes, and the dispersion of carbon nanotubes is poor, which limits the uniformity of composite materials.
[0005] After research, the applicant of this patent believes that the silicon-carbon composite material with a hollow structure is one of the reasonable structures to solve the key problems of silicon. Compaction density and limited electron transport path, so the research and development of a new structure and preparation method will promote the commercial application of silicon-carbon composite negative electrodes

Method used

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  • Carbon nanotube-filled silicon/hollow carbon composite negative electrode material and preparation method thereof
  • Carbon nanotube-filled silicon/hollow carbon composite negative electrode material and preparation method thereof
  • Carbon nanotube-filled silicon/hollow carbon composite negative electrode material and preparation method thereof

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Effect test

Embodiment 1

[0054] (1) Take 2g of silicon particles with a particle size of 10nm and disperse them in 100ml of an aqueous solution in which 0.002g of cetyltrimethylammonium bromide is dissolved, and after ultrasonic dispersion is uniform, stir for 10min to obtain surface-modified silicon particles;

[0055] (2) Take the surface-modified silicon particles obtained in step 1, add 1 g of polypropylene and 0.01 g of cobalt tetroxide powder, and mix them into a uniform precursor by mechanical ball milling;

[0056] (3) Place the homogeneous precursor described in the above step in a tube furnace, feed nitrogen gas, evacuate, keep the pressure in the tube at 1000 Pa, and perform heat treatment at a temperature of 800°C and a holding time of 2 hours;

[0057] (4) Dissolve 0.4g of glucose in 20ml of ethanol and 30ml of water, then add the silicon / carbon nanotubes obtained in step 3 into the above solution, stir evenly, and place it in a drying oven at 80°C for 24 hours. Obtain glucose-coated sili...

Embodiment 2

[0062] (1) Get 2g of silicon particles with a particle size of 300nm and disperse them in 100ml of alcohol solution in which 1g of cetyltrimethylammonium bromide is dissolved. After ultrasonic dispersion, stir for 5h to obtain surface-modified silicon particles;

[0063] (2) Take the surface-modified silicon particles obtained in step 1, add 10 g of polypropylene and 0.4 g of ferrosilicon powder, and mechanically mix to form a uniform precursor;

[0064] (3) Put the homogeneous precursor obtained in step 2 in a tube furnace, pass in argon, evacuate, keep the pressure in the tube at 600 Pa, and perform heat treatment. The heat treatment system is 10°C / min to 1200°C, and the holding time 0.5h;

[0065] (4) Dissolve 10g of sucrose in 20ml of methanol and 30ml of water, then add the silicon / carbon nanotubes obtained in step 3 into the above solution, stir evenly, place it in a drying oven at 150°C for 10h, and grind After obtaining the silicon / carbon nanotube composite sample coa...

Embodiment 3

[0070] (1) Take 2g of silicon particles with a particle size of 50nm and disperse them in 100ml of acetone solution in which 0.4g of cetyltrimethylammonium bromide is dissolved. After the ultrasonic dispersion is uniform, stir for 2h to obtain surface-modified silicon particles. ;

[0071] (2) Take the surface-modified silicon particles obtained in step 1, add 4 g of polypropylene and 0.1 g of nickel oxalate hydrate, and mechanically mix to form a uniform precursor;

[0072] (3) Put the homogeneous precursor obtained in step 2 in a tube furnace, pass in argon gas, evacuate, keep the pressure in the tube at 1200 Pa, and perform heat treatment. The heat treatment system is 5°C / min to 800°C, and the holding time for 2h;

[0073] (4) Dissolve 2g of starch in 20ml of ethanol and 30ml of water, then add the silicon / carbon nanotubes obtained in step 3 into the above solution, stir evenly, place it in a drying oven at 120°C for 15h, and grind Obtain starch-coated silicon / carbon nano...

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Abstract

Disclosed are a carbon nanotube-filled silicon / hollow carbon composite negative electrode material and a preparation method thereof. The composite negative electrode material is of a core-shell structure, wherein the core is a carbon nanotube cluster inlaid with silicon particles, and the shell is pyrolytic carbon. The preparation method comprises the following steps of uniformly mixing silicon particles, a metal catalyst and organic matters, and carrying out negative pressure heat treatment under a protective atmosphere to prepare the silicon / carbon nanotube cluster, adding the silicon / carbonnanotube cluster into a carbon source precursor solution to be uniformly stirred, and carrying out solid-liquid separation and drying, grinding, and then carrying out high-temperature carbonization treatment, and then dispersing in a hydrochloric acid solution, dissolving the metal catalyst, and performing washing and drying, and drying to obtain the carbon nanotube-filled silicon / hollow carbon composite negative electrode material. The prepared silicon-carbon composite negative electrode material can be used for improving the rate performance and the cycling stability when the silicon-carboncomposite negative electrode material is used for a lithium ion battery, and is simple in preparation process, wide in raw material source and suitable for large-scale production.

Description

technical field [0001] The invention relates to a silicon-carbon composite negative electrode material for a lithium ion battery and a preparation method thereof, in particular to a silicon / hollow carbon composite negative electrode material filled with carbon nanotubes and a preparation method thereof. The invention belongs to the field of composite material and electrochemical technology. Background technique [0002] At present, in the lithium-ion battery market, the mainstream anode material is graphite, which has the advantages of a wide range of raw material sources and stable material performance. However, the theoretical specific capacity of graphite anode is low, which greatly limits the development of high specific energy lithium-ion batteries. The development of new high-capacity anode materials is the key to optimizing the energy density and power density of lithium-ion batteries. At present, the alternative anode material that is widely concerned by researcher...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/386H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 周昊宸
Owner 湖南宸宇富基新能源科技有限公司
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