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A molybdenum carbide/carbon composite material with core-shell structure and its preparation method and application in lithium-air battery

A technology of carbon composite materials and core-shell structure, which is applied in the direction of fuel cell half-cells and secondary battery-type half-cells, structural parts, battery electrodes, etc. Harsh synthesis conditions, difficult to achieve industrial production and other issues, to achieve the effect of improving cycle stability, increasing wet contact area, and improving conductivity

Active Publication Date: 2020-02-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation method is complicated and difficult to realize industrial production
[0004] The above-mentioned carbides show good performance when applied to lithium-air batteries, etc., but most of their preparation methods have the disadvantages of harsh synthesis conditions and difficult control of morphology and material uniformity; molybdenum carbide is a new type of transition metal carbide due to its Its good performance in catalysis has attracted widespread attention, and its research as a catalyst material for lithium-air batteries is worth exploring

Method used

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  • A molybdenum carbide/carbon composite material with core-shell structure and its preparation method and application in lithium-air battery
  • A molybdenum carbide/carbon composite material with core-shell structure and its preparation method and application in lithium-air battery
  • A molybdenum carbide/carbon composite material with core-shell structure and its preparation method and application in lithium-air battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] First weigh 3.85g resorcinol and add it into a beaker, then measure 5mL, add 37% formaldehyde solution dropwise into the beaker, and stir to form a phenolic resin solution. Weigh 1.236g of ammonium molybdate and dissolve it in 60mL of water to form ammonium molybdate solution and add it to the above phenolic resin solution. After stirring evenly, transfer the resulting mixed suspension to a polytetrafluoroethylene solvothermal reaction kettle at 160°C. Solvothermal reaction, after 18 hours of reaction, the resulting precipitate was repeatedly washed with water and ethanol, and dried to obtain a spherical precursor.

[0046] Weigh an appropriate amount of spherical precursor, put it into a corundum porcelain boat, and place it in a vacuum tube furnace. Introduce argon gas, heat the tube furnace to 850°C for 6 hours, and obtain the molybdenum carbide / carbon composite material.

[0047] The lithium-air battery molybdenum carbide / carbon composite material prepared in this ...

Embodiment 2

[0054] First weigh 3.85g of resorcinol and add it into a beaker, then measure 6mL, add 37% formaldehyde solution dropwise into the beaker, and stir to form a phenolic resin solution. Weigh 1.236g of ammonium molybdate and dissolve it in 60mL of water to form ammonium molybdate solution and add it to the above phenolic resin solution. After stirring evenly, transfer the resulting mixed suspension to a polytetrafluoroethylene solvothermal reaction kettle and carry out at 180°C. Solvothermal reaction, after 14 hours of reaction, the resulting precipitate was repeatedly washed with water and ethanol, and dried to obtain a spherical precursor.

[0055] Weigh an appropriate amount of spherical precursor, put it into a corundum porcelain boat, and place it in a vacuum tube furnace. Introduce argon gas, heat the tube furnace to 800°C for 8 hours, and obtain the molybdenum carbide / carbon composite material.

[0056] The molybdenum carbide / carbon composite material prepared by the meth...

Embodiment 3

[0059] First weigh 3.85g of resorcinol and add it into a beaker, then measure 4mL, add 37% formaldehyde solution dropwise into the beaker, and stir to form a phenolic resin solution. Weigh 1.854g of ammonium molybdate and dissolve it in 60mL of water to form ammonium molybdate solution and add it to the above phenolic resin solution. After stirring evenly, transfer the resulting mixed suspension to a polytetrafluoroethylene solvothermal reaction kettle and carry out at 180°C. Solvothermal reaction, after 20 hours of reaction, the resulting precipitate was repeatedly washed with water and ethanol, and dried to obtain a spherical precursor.

[0060] Weigh an appropriate amount of spherical precursor, put it into a corundum porcelain boat, and place it in a vacuum tube furnace. Introduce argon gas, heat the tube furnace to 850°C for 8 hours, and obtain the molybdenum carbide / carbon composite material.

[0061] The molybdenum carbide / carbon composite material prepared by the meth...

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Abstract

The invention discloses a molybdenum carbide / carbon composite material with a core-shell structure, a preparation method thereof and an application in a lithium-air battery. The composite adopts a core-shell structure, and both the core and the shell are composed of molybdenum carbide-doped carbon material with a porous surface. The preparation method is to mix the molybdate solution with the resin solution to obtain a suspension, and the suspension is passed through the solvothermal method. Synthesize a spherical precursor; the spherical precursor is placed in a protective atmosphere and heat-treated at a high temperature to obtain a molybdenum carbide / carbon composite material with good electrical conductivity, large specific surface area and high catalytic activity, which can be used as a lithium-air battery The catalyst material has low overpotential, high specific capacity and excellent cycle performance, and its preparation method is simple, low in cost, and has broad industrial application prospects.

Description

technical field [0001] The invention relates to a novel lithium-air battery catalyst material and a preparation method thereof, in particular to a molybdenum carbide / carbon composite material with a core-shell structure and a porous surface and a preparation method thereof, as well as its application as a catalytic material in a lithium-air battery , belonging to the field of lithium-air batteries. Background technique [0002] As an electrochemical energy storage device that occupies a dominant position in society, lithium-ion batteries have achieved rapid development in portable electronic products (notebook computers, smart mobile devices, tablet computers, etc.), and have also shown good performance in the field of electric vehicles. Prospects. The domestic automobile industry has a huge market. People's basic requirement for electric vehicles is that they can travel 500km on a single charge, which requires that the energy density of lithium-ion secondary batteries used...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/90H01M12/08
CPCH01M4/8657H01M4/88H01M4/90H01M12/08Y02E60/10
Inventor 张治安宋俊肖吕晓军赖延清陈晓彬焦一峰李煌旭李天伟
Owner CENT SOUTH UNIV
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