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Molybdenum carbide/carbon composite material, and preparation method and application thereof

A carbon composite material and composite material technology, applied in the field of molybdenum carbide/carbon composite material and its preparation, can solve the problems of molybdenum carbide composite materials to be developed, achieve excellent cycle stability, high electronic conductance and ion conductance, easy to obtain Effect

Active Publication Date: 2019-04-19
LANGFANG GREEN IND TECH CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the above methods disclose molybdenum carbide composite materials and their applications, they still have certain limitations. Molybdenum carbide composite materials with high specific capacity, high cycle stability and long cycle life for lithium-ion batteries still need to be developed.

Method used

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  • Molybdenum carbide/carbon composite material, and preparation method and application thereof
  • Molybdenum carbide/carbon composite material, and preparation method and application thereof

Examples

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Embodiment 1

[0051] This embodiment provides a method for preparing a molybdenum carbide / carbon composite material, the preparation method comprising the following steps:

[0052] (1) Dissolve a certain amount of ammonium molybdate, copper chloride, and urea in deionized water, stir evenly, and make a clear and transparent solution a, wherein the concentration of molybdenum source is 0.1mM, Mo / Cu molar ratio=0.01:1 , the concentration of urea in the mixture is 0.2g / mL; after the solution a is stirred evenly, it is placed in a hydrothermal tank and heated in an oven at 150°C for 1 hour to obtain a precipitate; the solid-liquid separation of the obtained precipitate is performed with deionized water and Washed with alcohol several times, dried in an oven at 90°C to obtain the precursor;

[0053] (2) Put the precursor obtained in step (1) in a tube furnace, pass through acetylene gas, and heat-treat at 1000 ° C for 1 h to obtain Mo 2 C / Cu / C composite material;

[0054] (3) Mo obtained by st...

Embodiment 2

[0060] This embodiment provides a method for preparing a molybdenum carbide / carbon composite material, the preparation method comprising the following steps:

[0061] (1) A certain amount of ammonium molybdate, cupric chloride, urea are dissolved in deionized water, stir evenly, make clear transparent solution a, wherein the concentration of molybdenum source is 5mM, Mo / Cu mol ratio=10:1, The concentration of urea in the mixture is 100g / mL; after stirring solution a evenly, place it in a hydrothermal tank and heat it in an oven at 200°C for 12 hours to obtain a precipitate; separate the obtained precipitate from solid and liquid, and wash it with deionized water and alcohol Repeatedly, dry in an oven at 50°C to obtain the precursor;

[0062] (2) Put the precursor obtained in step (1) in a tube furnace, pass through acetylene gas, and heat-treat at 700°C for 12h to obtain Mo 2 C / Cu / C composite material;

[0063] (3) Mo obtained by step (2) 2 The C / Cu / C composite material is ...

Embodiment 3

[0067] This embodiment provides a method for preparing a molybdenum carbide / carbon composite material, the preparation method comprising the following steps:

[0068] (1) A certain amount of ammonium molybdate, cupric chloride, urea are dissolved in deionized water, stir evenly, make clear transparent solution a, wherein the concentration of molybdenum source is 2mM, Mo / Cu mol ratio=0.2:1, The concentration of urea in the mixture is 60g / mL; after stirring solution a evenly, place it in a hydrothermal tank and heat it in an oven at 160°C for 2 hours to obtain a precipitate; separate the solid and liquid of the obtained precipitate, and wash it with deionized water and alcohol Repeatedly, dry in an oven at 60°C to obtain the precursor;

[0069] (2) Place the precursor obtained in step (1) in a tube furnace, pass through acetylene gas, and heat-treat at 800°C for 2 hours to obtain Mo 2 C / Cu / C composite material;

[0070] (3) Mo obtained by step (2) 2 The C / Cu / C composite mater...

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Abstract

The invention provides a molybdenum carbide / carbon composite material, and a preparation method and an application thereof. The preparation method comprises the steps of: (1) dissolving a molybdenum source, a copper source and a precipitant in water, mixing them to obtain a mixture, and then subjecting the obtained mixture to a hydrothermal reaction to obtain a precursor; (2) subjecting the precursor obtained in the step (1) to heat treatment in an acetylene gas or a mixed gas of acetylene and argon to obtain a Mo2C / Cu / C composite material; and placing the Mo2C / Cu / C composite material obtainedin the step (2) in an FeCl3 aqueous solution to remove copper, so as to obtain the molybdenum carbide / carbon composite material. The molybdenum carbide / carbon composite material has high electronic conductance and ion conductance, and has the advantages of high specific capacity, excellent cycle stability and long cycle life when used as an electrode material. The molybdenum carbide / carbon composite material is simple in preparation method, adopts the raw materials which are easy to obtain and low in price, is easy to implement, and is expected to be applied to a lithium ion battery.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a molybdenum carbide / carbon composite material and a preparation method and application thereof. Background technique [0002] With the vigorous development of new energy vehicles, the lithium-ion battery industry has entered a stage of rapid development. The key materials that affect the performance of lithium-ion batteries mainly include positive electrode materials, negative electrode materials, and electrolytes. In terms of negative electrode materials, the theoretical specific capacity of traditional graphite negative electrode materials is only 372mAh / g, which limits the improvement of the energy density of lithium-ion batteries. [0003] In view of the flat surface and large specific surface area of ​​two-dimensional monolayer materials, it is very possible to obtain high energy density and high mobility as anode materials for batteries. Among them, Mo 2 C has excelle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/58H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 谭强强夏青
Owner LANGFANG GREEN IND TECH CENT
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