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Iron disulfide/carbon nano tube composite material of neural network structure and preparation method thereof

A carbon nanotube and iron disulfide technology, which is applied in the field of inorganic nanomaterial synthesis, can solve the problems of not alleviating the volume expansion of iron disulfide and the large size of iron disulfide, and achieves improved cycle performance, improved wettability, and improved electrical conductivity. Effect

Inactive Publication Date: 2017-06-13
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although Liu (Ling Liu, Zhongzhi Yuan, Caixia Qiua, Jincheng Liu. Solid State Ionics. 2013, 241, 25–29) combined iron disulfide and carbon nanotubes to prepare iron disulfide / carbon nanotube composites and applied them In the positive electrode of lithium-ion batteries, but because the size of iron disulfide in the composite material prepared by it is relatively large (2-3 μm), and the carbon nanotubes are dispersed among the iron disulfide microspheres in a disorderly agglomeration mode, the composite material The electrical conductivity has been improved but it has not alleviated the volume expansion of iron disulfide during charging and discharging.

Method used

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  • Iron disulfide/carbon nano tube composite material of neural network structure and preparation method thereof
  • Iron disulfide/carbon nano tube composite material of neural network structure and preparation method thereof
  • Iron disulfide/carbon nano tube composite material of neural network structure and preparation method thereof

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Embodiment 1

[0030] 1). Add 1.2g of carbon nanotubes to a mixed solution containing 400ml of ethylene glycol and 200ml of N,N-dimethylformamide, and ultrasonically for 0.5h to obtain a mixed solution in which carbon nanotubes are uniformly dispersed. Nanotube concentration is 2g / L;

[0031]2). Add 6g of ferrous sulfate to the uniformly dispersed mixed solution of carbon nanotubes prepared in step 1), stir at 200r / min for 10min, add 4g of sublimed sulfur and 6g of urea, and continue to stir at 200r / min for 1h. Prepare a mixed solution containing carbon nanotubes, iron salts and sulfur;

[0032] 3). Insulate the mixed solution containing carbon nanotubes, iron salt and sulfur prepared in step 2) at 170° C. for 48 hours;

[0033] 4). The hydrothermal product was repeatedly washed 6 times with deionized water and ethanol to remove impurities, and vacuum-dried at 110° C. for 12 hours to obtain an iron disulfide / carbon nanotube composite material with a neural network structure.

[0034] Such ...

Embodiment 2

[0036] 1). Add 4g of carbon nanotubes to a mixed solution containing 400ml of ethylene glycol and 400ml of N,N-dimethylformamide, and ultrasonically for 1 hour to obtain a mixed solution in which carbon nanotubes are uniformly dispersed. In the mixed solution, carbon nanotubes The concentration is 5g / L;

[0037] 2). Add 5g of ferrous sulfate to the uniformly dispersed mixture of carbon nanotubes prepared in step 1), stir at 300r / min for 20min, add 3.33g of sublimed sulfur and 6.66g of urea, and continue stirring at 300r / min After 0.5h, a mixed solution containing carbon nanotubes, iron salts and sulfur was obtained;

[0038] 3). Insulate the mixed solution containing carbon nanotubes, iron salt and sulfur prepared in step 2) at 190° C. for 24 hours;

[0039] 4). The hydrothermal product was repeatedly washed with deionized water and ethanol 8 times to remove impurities, and vacuum-dried at 100°C for 10 hours to obtain an iron disulfide / carbon nanotube composite material with ...

Embodiment 3

[0042] 1). Add 3.5g of carbon nanotubes to a mixed solution containing 300ml of ethylene glycol and 200ml of N,N-dimethylformamide, and ultrasonically for 1 hour to obtain a mixed solution in which carbon nanotubes are uniformly dispersed. In the mixed solution, carbon nanotubes Tube concentration is 7g / L,;

[0043] 2). Add 3.5g of ferrous sulfate to the uniformly dispersed mixed solution of carbon nanotubes prepared in step 1), stir at 400r / min for 30min, add 2.33g of sublimed sulfur and 4.19g of urea, and continue to stir at 400r / min Stir for 1h to obtain a mixed solution containing carbon nanotubes, iron salts and sulfur;

[0044] 3). Insulate the mixed solution containing carbon nanotubes, iron salt and sulfur prepared in step 2) at 180° C. for 12 hours;

[0045] 4). The hydrothermal product was repeatedly washed with deionized water and ethanol 8 times to remove impurities, and vacuum-dried at 60° C. for 12 hours to obtain an iron disulfide / carbon nanotube composite mate...

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Abstract

The invention provides an iron disulfide / carbon nano tube composite material of a neural network structure and a preparation method thereof. The preparation method comprises the following steps of adding a carbon nano tube into mixed liquor of ethylene glycol and N,N'-dimethylformamide, and carrying out ultrasonic treatment to obtain carbon nano tube uniformly dispersed mixed liquor; adding ferrous sulfate, sublimed sulfur and urea into the mixed liquor, sufficiently agitating an obtained mixture, and then transferring the mixture into a hydrothermal reaction kettle to carry out a reaction; centrifugally separating a deposit, washing the deposit by using deionized water and alcohol, and then carrying out vacuum drying to obtain the iron disulfide / carbon nano tube composite material which is of the neural network structure. The iron disulfide / carbon nano tube composite material is of a three-dimensional neural network structure which is formed by mutually connecting neurons for which an iron disulfide particle is used as a neuron cell and the carbon nano tube is used as a prominence, wherein the diameter of the iron disulfide particle is not more than 200nm. The neural network structure can be used for improving the electric conductivity of a material; meanwhile, the volume expansion of iron disulfide in charging and discharging processes is buffered through the mechanical property of the carbon nano tube; besides, the wettability of an electrolyte on the material can be also improved through the three-dimensional structure of a neutral network and the nano size of the iron disulfide; the cyclical stability of an iron disulfide material as a sodium-ion negative electrode is greatly improved.

Description

technical field [0001] The invention belongs to the field of synthesis of inorganic nanometer materials. More specifically, it relates to the preparation of iron disulfide / carbon nanotube composite material and method with neural network structure by hydrothermal method. Background technique [0002] With the rapid development of modern industry and transportation, the energy resources on the earth are gradually becoming exhausted, so the emergence of new energy is of great significance. Lithium-ion batteries have the advantages of high energy density, high discharge voltage, small self-discharge, no memory effect, and low environmental pollution. They have been widely used in electronic products, electric vehicles, and military fields. However, with the advent of the era of electric vehicles and smart grids, global lithium resources will not be able to effectively meet the huge demand for power lithium-ion batteries, which will further push up the prices of lithium-related...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M10/054
CPCH01M4/364H01M4/38H01M4/5815H01M10/054Y02E60/10
Inventor 孙晓红陈媛媛郑春明
Owner TIANJIN UNIV
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