Transition metal oxide carbon nanotube composite material and its preparation method and application

A technology of carbon nanotubes and transition metals, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of electrochemical performance cycle stability, unsatisfactory rate performance, and poor conductivity. Achieve the effects of improving cycle performance and stability, cycle performance, and conductivity

Inactive Publication Date: 2017-10-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, like other transition metal oxides, its electrical conductivity is poor (2×104S/m, 25°C), and there is a volume change of up to 200% with t

Method used

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  • Transition metal oxide carbon nanotube composite material and its preparation method and application
  • Transition metal oxide carbon nanotube composite material and its preparation method and application
  • Transition metal oxide carbon nanotube composite material and its preparation method and application

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Experimental program
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Embodiment 1

[0030] (1) Weigh 0.04g hydroxylated carbon nanotubes, 1.2mmol ferric nitrate, 10mmol urea, 0.11mmol cetyltrimethylammonium bromide, 2mmol glucose, add 75mL ethanol-water solution (the volume ratio of ethanol and water is 1:2) Ultrasonic dispersion for 40 minutes after mixing;

[0031] (2) Transfer the system prepared in step (1) to a hydrothermal kettle for hydrothermal synthesis reaction, wherein the reaction temperature is 190°C, and the reaction time is 12h;

[0032] (3) The reaction system obtained in step (2) was left to stand, centrifuged and washed to neutrality, and dried at 60° C. in air for 12 hours to finally obtain a carbon-coated iron oxide carbon nanotube composite material.

[0033] figure 1 It is the low-magnification SEM image of the iron oxide carbon nanotube composite material coated with carbon obtained in Example 1. It can be seen that the total diameter of the nanotubes obtained is close to 50nm, which is far greater than the diameter of the carbon nanot...

Embodiment 2

[0037] (1) Weigh 0.04g hydroxylated carbon nanotubes, 1.2mmol cobalt nitrate, 10mmol urea and 0.11mmol cetyltrimethylammonium bromide, add 75mL ethanol-water solution (the volume ratio of ethanol and water is 1:2 ) ultrasonically disperse for 40 minutes after mixing;

[0038] (2) Transfer the system prepared in step (1) to a hydrothermal kettle for hydrothermal synthesis reaction, wherein the reaction temperature is 190°C, and the reaction time is 24h;

[0039] (3) The system obtained from the reaction in step (2) is left to stand, centrifuged and washed to neutrality, and dried at 60°C for 12 hours in air to finally obtain a cobalt oxide carbon nanotube composite material;

[0040] Figure 4 It is a low-magnification SEM image of the cobalt oxide carbon nanotube composite material obtained in Example 2. It can be seen that the surface of the carbon nanotube is uniformly coated with a layer of cobalt oxide, and the total diameter is between 30nm and 100nm.

Embodiment 3

[0042] (1) Utilize the carbon nanotube film synthesized by floating catalytic chemical vapor deposition method, refer to the Chinese patent whose publication number is CN103031624A for details, wash and dry with sufficient amount of aqua regia for 12h~36h, and obtain the carbon nanotube film treated with aqua regia ;

[0043] (2) Weigh 0.04g of aqua regia-treated carbon nanotube membrane, 1.2mmol of ferric nitrate, 10mmol of urea and 0.11mmol of cetyltrimethylammonium bromide, add 75mL of ethanol aqueous solution (the volume ratio of ethanol and water is 1 :2) Ultrasonic dispersion for 40min after mixing;

[0044] (3) Transfer the system prepared in step (1) to a hydrothermal kettle for hydrothermal synthesis reaction, wherein the reaction temperature is 190°C, and the reaction time is 12h;

[0045](4) The reaction system obtained in step (2) is left to stand, washed until neutral, and dried at 60° C. for 12 hours to finally obtain the iron oxide carbon nanotube membrane comp...

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Abstract

The invention discloses a transition metal oxide carbon nanotube composite material and its preparation method and application. The preparation method includes steps of (1), dispersing carbon nanotube, transition metal nitrate, glucose, alkali environment promoter and surface active agent in mixed solution of ethanol and water respectively, performing ultrasound dispersion for 20-60 min; (2), transferring the system prepared in step (1) to a hydrothermal kettle to perform hydro-thermal synthesis reaction, wherein the reaction temperature is 160-190 DEG C, and the reaction time is 12h-24h; (3), staying and washing the system acquired in reaction of step (2) until neutral; drying for 12-24 hours under the air condition of 60-100 DEG C; finally, acquiring the transition metal oxide carbon nanotube composite material. The transition metal oxide carbon nanotube composite material has the beneficial effect of improving the material cycle performance and stabilization performance.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a transition metal oxide carbon nanotube composite material and its preparation method and application. Background technique [0002] Transition metal oxides have the advantages of large specific capacity, non-toxicity, environmental friendliness, and high safety, as well as rich sources of raw materials and low prices, so they are a class of anode materials with great development potential for lithium-ion batteries. However, like other transition metal oxides, its electrical conductivity is poor (2×104S / m, 25°C), and there is a volume change of up to 200% with the intercalation and extraction of lithium ions, so its electrochemical performance (including cycling stability and rate performance) are not ideal. Carbon nanotubes have good crystallinity, unique mechanical and electrical properties and structural characteristics, and can form a conductive network with sup...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/52H01M4/583H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/48H01M4/52H01M4/583H01M10/0525Y02E60/10
Inventor 侯峰蒋小通李国君
Owner TIANJIN UNIV
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