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Titanium niobium oxide/vertical graphene/titanium carbide-carbon composite material and its preparation method and application

A technology of carbon composite materials and titanium carbide, which is applied in the direction of electrochemical generators, active material electrodes, structural parts, etc., can solve the problems of low safety performance and achieve the effect of improving structural stability, high energy density, and large specific surface area

Active Publication Date: 2021-06-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of helical titanium niobium oxide / vertical graphene / titanium carbide-carbon composite material (i.e. Ti 2 Nb 10 o 29 @VG@TiC-C electrode material) and its simple preparation method and application, the Ti 2 Nb 10 o 29-x @VG@TiC-C electrode material has high power density, high energy density, and high safety and stability

Method used

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  • Titanium niobium oxide/vertical graphene/titanium carbide-carbon composite material and its preparation method and application
  • Titanium niobium oxide/vertical graphene/titanium carbide-carbon composite material and its preparation method and application
  • Titanium niobium oxide/vertical graphene/titanium carbide-carbon composite material and its preparation method and application

Examples

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preparation example

[0030] Preparation example (vertical graphene / titanium carbide-carbon material)

[0031] (1) Ultrasonic the Ti6Al4V base material with dilute hydrochloric acid, and then wash it several times with deionized water and ethanol to remove the oil on the surface.

[0032] (2) Put the Ti6Al4V base material obtained in step (1) in a tube furnace, and raise the temperature to 800° C. under the atmosphere of argon and hydrogen. Then introduce the carbon-containing liquid into the cavity by bubbling, keep it warm for 1.5 hours, and get the titanium carbide-carbon material grown on the Ti6Al4V substrate after taking it out;

[0033] (3) The titanium carbide-carbon material obtained in step (2) was placed in a tube furnace, and vacuumed to make the system pressure reach 10 mTorr. Then the temperature was raised to 500°C, and hydrogen plasma was generated when the microwave power reached 600W under the hydrogen atmosphere. After the titanium carbide-carbon is treated with plasma, the tem...

Embodiment 1

[0035] Weigh 0.2849g C 12 h 28 o 4 Ti, add 60mL absolute ethanol, stir for 10 minutes, then add 1.35g NbCl 5, and stirred for 15 minutes until completely dissolved to form a mixed solution. Put the VG@TiC / C base material into the mixed solution and then move it into a polytetrafluoroethylene autoclave, seal the autoclave, and conduct a hydrothermal reaction at 200°C for 24 hours. After the reaction, cool to room temperature 25°C, pour out the solution and take out the sample, wash and dry it with deionized water, then cool naturally to room temperature 25°C to obtain Ti 2 Nb 10 o 29 Precursor. Finally, it was put into a tube furnace and sintered at 700°C for 2 hours with argon gas to obtain Ti 2 Nb 10 o 29 @VG@TiC-C target product.

[0036] The scanning electron microscope images of TiC-C and VG@TiC / C prepared in Example 1 are as follows figure 1 Shown; Ti obtained in embodiment 1 2 Nb 10 o 29 The scanning electron microscope image of @VG@TiC / C is as follows fi...

Embodiment 2

[0038] Weigh 0.2849g C 12 h 28 o 4 Ti, add 60mL absolute ethanol, stir for 10 minutes, then add 1.35g NbCl 5 , and stirred for 15 minutes until completely dissolved to form a mixed solution. Put the VG@TiC / C base material into the mixed solution and then move it into a polytetrafluoroethylene autoclave, seal the autoclave, and conduct a hydrothermal reaction at 180°C for 10 hours. After the reaction, cool to room temperature 25°C, pour out the solution and take out the sample, wash and dry it with deionized water, then cool naturally to room temperature 25°C to obtain Ti 2 Nb 10 o 29 Precursor. Finally, it was put into a tube furnace and sintered at 750°C for 2 hours with argon gas to obtain Ti 2 Nb 10 o 29 @VG@TiC-C target product.

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Abstract

The invention discloses a titanium niobium oxide / vertical graphene / titanium carbide-carbon composite material, a preparation method thereof and an application as a positive electrode material of a lithium ion battery. Firstly, the VG@TiC-C substrate material is obtained by CVD and PECVD technology. Then through the hydrothermal and sintering process, the helical Ti was loaded on the VG@TiC‑C substrate 2 Nb 10 o 29 nanoparticles. The Ti 2 Nb 10 o 29 The @VG@TiC‑C composite material has a large specific surface area, which can increase the contact surface between the electrolyte and the electrode. At the same time, VG@TiC‑C accelerates the electron conduction rate and enhances the structural stability of the composite material. Through battery tests, it is found that the material prepared by the invention has the characteristics of long cycle life, high energy and power density, and has broad application prospects in the fields of mobile communication, electric vehicles, solar power generation, aerospace and the like.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a titanium niobium oxide / vertical graphene / titanium carbide-carbon composite material and a preparation method and application thereof. Background technique [0002] The rapid expansion of the consumer market for electronic products has greatly increased the demand for high-performance and high-stability battery materials. Titanium niobate compound has a good lithium storage structure, which determines its good electrochemical performance. At present, the main negative electrode materials used include graphite and lithium titanate, but there are serious problems. Graphite is easy to form SEI film due to its low voltage platform, thereby forming lithium dendrites, which is easy to cause explosion. Although the voltage platform of lithium titanate is relatively high, no SEI film will be formed, but its low theoretical capacity (175mAh g -1 ) m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M10/0525
CPCH01M4/362H01M4/483H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 夏新辉邓盛珏张燕涂江平王秀丽
Owner ZHEJIANG UNIV
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