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Molybdenum carbide carbon nanofiber composite material and preparation method and application thereof

A carbon nanofiber and composite material technology, applied in the field of damping materials, can solve the problems of harsh synthesis conditions, difficult control of shape and material uniformity, etc., to improve specific capacity, improve cycle stability and electrochemical performance, increase moisture The effect of wet contact area

Pending Publication Date: 2022-02-11
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems in the prior art that the synthesis conditions of lithium battery negative electrode materials are harsh, and the shape and material uniformity are not easy to control, the purpose of the present invention is to provide a molybdenum carbide carbon nanofiber composite material and a molybdenum carbide carbon nanofiber composite material. Preparation method, application of molybdenum carbide carbon nanofiber composite material

Method used

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  • Molybdenum carbide carbon nanofiber composite material and preparation method and application thereof
  • Molybdenum carbide carbon nanofiber composite material and preparation method and application thereof
  • Molybdenum carbide carbon nanofiber composite material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0052] First, weigh 0.7g of polyacrylonitrile and add it into a beaker, add 5.5ml of DMF solution, stir evenly, add 0.8g of phosphomolybdic acid for further stirring, and obtain a homogeneous solution.

[0053] Electrospinning the mixed solution to obtain nanofibers mixed with phosphomolybdic acid and polymers is first subjected to pre-oxidation treatment, then deoxidation treatment, and then laser carbonization treatment to obtain laser carbonized molybdenum carbide carbon nanofiber composite materials.

[0054] Among them, the pre-oxidation treatment condition is to keep 2 hours under aerobic conditions (such as air) at 250°C in a muffle furnace, and the deoxidation treatment is to keep half an hour at 1100°C in nitrogen; the laser carbonization treatment condition is: the power is Under 300W, the carbonization temperature is 1000-5000°C, and the time is 1-1.5h, and the laser carbonized molybdenum carbide carbon nanofiber composite material (LaserMo 2 C@C).

[0055] The lit...

Embodiment 2

[0063] The difference from Example 1 is that the conditions of laser carbonization are: laser power 400W, temperature 1000-5000°C, and laser carbonized molybdenum carbide carbon nanofiber composite material is obtained.

[0064] The composite material prepared in Example 2 also exhibited excellent long-term cycle stability and high specific capacity.

Embodiment 3

[0066] The difference from Example 1 is that the conditions of laser carbonization are: laser power 200W, temperature 1000-5000°C, and laser carbonized molybdenum carbide carbon nanofiber composite material is obtained.

[0067] The composite material prepared in Example 3 also exhibited excellent long-term cycle stability and high specific capacity.

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Abstract

The invention relates to a molybdenum carbide carbon nanofiber composite material and a preparation method and application thereof, and relates to the field of composite materials, and the composite material comprises carbon nanofibers, molybdenum carbide dispersed in the carbon nanofibers and a graphitized carbon layer located on the outer surface. The laser-carbonized molybdenum carbide carbon nanofiber composite material has a relatively high specific surface area, a two-dimensional network is formed among the carbon nanofibers, the conductivity of an electrode material is improved, the wetting contact area between the electrode material and an electrolyte can be increased, meanwhile, molybdenum carbide is uniformly dispersed in the carbon nanofibers, so that more active sites are exposed, the composite material electrochemistry performance is improved; and after laser carbonization, the carbon nanofiber with characteristics of high graphitization degree and extremely high stability is obtained, so that the cycle stability and the electrochemical performance of the lithium ion battery are further improved, the electron transmission is easily achieved, and the cycle stability of the lithium ion battery is easily improved.

Description

technical field [0001] The invention relates to the technical field of damping materials, in particular to a molybdenum carbide carbon nanofiber composite material, a preparation method thereof, and an application of the molybdenum carbide carbon nanofiber composite material. Background technique [0002] In recent years, lithium-ion batteries have been widely used in various fields due to their high energy density and power density, safety and reliability, and long cycle life. With the increasing demand for battery energy and power in commercial applications, it is necessary to further improve the performance of lithium-ion batteries. However, since the electrode material of lithium-ion batteries is graphite, the capacity of lithium-ion batteries is relatively low. Although graphite still shows great advantages: high first Coulombic efficiency, long-term cycle stability, non-toxicity and low cost, but low electrochemical capacity (theoretical LiC 6 =372mAhg -1 ) graphite...

Claims

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Application Information

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IPC IPC(8): C01B32/949C01G39/02C01B32/15H01M4/36H01M4/38H01M4/583B82Y30/00B82Y40/00
CPCC01B32/949C01B32/15C01G39/02H01M4/364H01M4/38H01M4/583B82Y30/00B82Y40/00C01P2004/80C01P2006/40C01P2004/62C01P2004/64C01P2002/72C01P2002/82C01P2004/04C01P2002/85C01P2004/03Y02E60/10
Inventor 宋宇飞胡汉斌陈伟李好义杨卫民
Owner BEIJING UNIV OF CHEM TECH