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Preparation method of carbon nanotube/silica/carbon composite cathode material

A technology of carbon nanotubes and silicon dioxide, which is applied in the preparation of negative electrode active materials carbon nanotubes/silicon dioxide/carbon composite materials and the preparation of lithium-ion battery electrode materials, can solve problems such as poor cycle stability, Achieve excellent charge-discharge cycle stability, moderate conditions, and simple process

Inactive Publication Date: 2016-10-26
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, studies have found that the cycle stability of carbon nanotube / silicon dioxide composite anode materials is not good, and further coating the surface of carbon nanotubes / silicon dioxide with a layer of amorphous carbon can effectively improve the capacity and cycle of the material. stability, and thus, the cycle performance of carbon-coated silica / carbon nanotube anode materials is improved

Method used

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  • Preparation method of carbon nanotube/silica/carbon composite cathode material
  • Preparation method of carbon nanotube/silica/carbon composite cathode material
  • Preparation method of carbon nanotube/silica/carbon composite cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0017] According to absolute ethanol: the volume ratio of deionized water is 1:5 to configure ethanol solution, according to cetyltrimethylammonium bromide: ethanol solution mass ratio is 1:200 to cetyltrimethyl bromide Ammonium is dissolved in ethanol solution, and lithium hydroxide is added to the above solution while stirring, and the mass ratio of cetyltrimethylammonium bromide:lithium hydroxide is 5:1. After thorough stirring, add carbon nanotubes into the above solution according to the ratio of carbon nanotubes: ethanol solution mass ratio of 1:3000 and stir evenly. Finally, tetraethyl orthosilicate was added according to the volume ratio of tetraethyl orthosilicate: ethanol solution of 1:500, and the above solution was stirred at 20°C for 10 hours, washed with deionized water and alcohol, filtered and dried to obtain carbon nano Tube / silica powder.

[0018] figure 1 (a) is the X-ray diffraction spectrum of carbon nanotubes / silicon dioxide. After calibration, it is fo...

Embodiment 2

[0020] According to absolute ethanol: the volume ratio of deionized water is 1:3 to configure ethanol solution, according to cetyltrimethylammonium bromide: the mass ratio of ethanol solution is 1:100 to cetyltrimethyl bromide Ammonium is dissolved in ethanol solution, and lithium hydroxide is added to the above solution while stirring, and the mass ratio of cetyltrimethylammonium bromide:lithium hydroxide is 10:1. After thorough stirring, add carbon nanotubes into the above solution according to the ratio of carbon nanotubes: ethanol solution mass ratio of 1:1000 and stir evenly. Finally, tetraethyl orthosilicate was added according to the volume ratio of tetraethyl orthosilicate: ethanol solution of 1:300, and the above solution was stirred at 40°C for 8 hours, washed with deionized water and alcohol, filtered and dried to obtain carbon nano Tube / silica powder. .

[0021] Mix the carbon nanotube / silicon dioxide powder and sucrose evenly in a mass ratio of 1:1, dissolve the...

Embodiment 3

[0024] According to absolute ethanol: the volume ratio of deionized water is 1:1 to configure ethanol solution, according to cetyltrimethylammonium bromide: the mass ratio of ethanol solution is 1:300 to cetyltrimethyl bromide Ammonium is dissolved in ethanol solution, and lithium hydroxide is added to the above solution while stirring, and the mass ratio of cetyltrimethylammonium bromide:lithium hydroxide is 20:1. After thorough stirring, add carbon nanotubes into the above solution according to the ratio of carbon nanotubes: ethanol solution mass ratio of 1:500 and stir evenly. Finally, tetraethyl orthosilicate was added according to the volume ratio of tetraethyl orthosilicate: ethanol solution of 1:100, and the above solution was stirred at 60°C for 5 hours, washed with deionized water and alcohol, filtered and dried to obtain carbon nano Tube / silica powder.

[0025] The carbon nanotube / silicon dioxide powder and sucrose were evenly mixed according to the mass ratio of 1:...

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Abstract

The invention relates to a preparation method of a carbon nanotube / silica / carbon composite cathode material and belongs to the field of electrochemical power sources. The composite cathode material is composed of a carbon nanotube, silica and amorphous carbon. The preparation method: respectively dissolving hexadecyl trimethyl ammonium bromide and lithium hydroxide in an alcohol solution; placing the carbon nanotube in the alcohol solution, dissolving silica with tetraethoxysilane as a raw material in the alcohol solution, and stirring, filtering and drying to obtain carbon nanotube / silica; using sucrose as a carbon source, mixing carbon nanotube / silica with sucrose, dissolving in deionized water, removing water through stirring and drying, sintering for certain time at high temperature under protection of inert gas, and cooling to obtain carbon nanotube / silica / carbon. The composite cathode material has high specific capacity and excellent circulating stability. The preparation method is simple, moderate in preparation condition and low in cost.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery electrode material, in particular to a preparation method of a negative electrode active material carbon nanotube / silicon dioxide / carbon composite material. The invention belongs to the field of chemical power sources. Background technique [0002] In recent years, with the rapid development of portable consumer electronics and new energy electric vehicles, people have put forward higher requirements for the capacity, cycle life and safety of lithium-ion batteries. At present, the negative electrode active materials of commercial lithium-ion batteries use various graphite-based carbon materials, and their theoretical specific capacity is only 372mAh / g, which is difficult to meet the requirements of high specific energy lithium-ion batteries. In recent years, silicon dioxide SiO 2 As a negative electrode material for lithium-ion batteries, silicon dioxide has gradually attracted at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/362H01M4/483H01M4/625H01M10/0525Y02E60/10
Inventor 陈玉喜刘雪莲
Owner HUNAN UNIV
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