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Mo2C and carbon-coated molybdenum-based heterostructure material as well as preparation method and application thereof

A heterogeneous structure and carbon encapsulation technology, which is applied in the preparation/purification of carbon, nanotechnology for materials and surface science, structural parts, etc., can solve difficult problems such as material volume expansion and particle breakage, and promote Effects of electrochemical kinetics, improving cycle stability, and improving lithium storage capacity

Pending Publication Date: 2022-05-27
LUOYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, loading excessive metal oxide nanoparticles on the surface of a conductive substrate is still difficult to solve the volume expansion and particle breakage of materials during charge and discharge.

Method used

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  • Mo2C and carbon-coated molybdenum-based heterostructure material as well as preparation method and application thereof
  • Mo2C and carbon-coated molybdenum-based heterostructure material as well as preparation method and application thereof
  • Mo2C and carbon-coated molybdenum-based heterostructure material as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0030] a Mo 2 The preparation method of the molybdenum-based heterostructure material sandwiched by C and carbon comprises the following steps:

[0031] S1. Dissolve the molybdenum source and complexing agent in 20-100mL of Mo of a certain concentration 2 CT X In the dispersion, the obtained solution is hydrothermally treated at 100-200°C for 2-40h. After filtering with deionized water until the filtrate was neutral, the obtained solid was dried at 40-100 °C for 10-40 h. The concentration of molybdenum ions in the solution is 1-15 mg / mL.

[0032] S2. Dissolve 0.1-2 g of the above solid in 30-600 mL of an initiator solution with a concentration of 5 mmol / L-1 mol / L, stir for 0.1-12 h, and add 0.1-2 g of polymer monomers. Under stirring conditions, after polymerization for 2-48 h, the suspension was filtered with deionized water until the filtrate was neutral, and the obtained solid was dried at 40-150° C. for 2-48 h. Finally, the solid is placed in a tube furnace, and is he...

Embodiment 1

[0037] Dissolve 200 mg of ammonium molybdate and 100 mg of melamine in 30 mL of Mo with a concentration of 2.5 mg / mL 2 CT X In the dispersion, the obtained solution was hydrothermally treated at 120°C for 12h. After filtering with deionized water until the filtrate was neutral, the obtained solid was dried at 60°C for 24h. 0.2 g of the above solid was dissolved in 60 mL of a tris solution with a concentration of 10 mmol / L and stirred for 0.2 h, and 0.2 g of dopamine hydrochloride was added. Under stirring conditions, after polymerization for 12 h, the suspension was filtered with deionized water until the filtrate was neutral, and the obtained solid was dried at 80° C. for 12 h. Finally, the solid was placed in a tube furnace, and under the protection of argon atmosphere, the temperature was raised to 600 °C for 3 h at a heating rate of 2 °C / min to obtain Mo 2 Molybdenum-based heterostructure material sandwiched by C and carbon.

[0038] figure 1 In order to obtain the sc...

Embodiment 2

[0041] Dissolve 400 mg of ammonium molybdate and 200 mg of melamine in 60 mL of Mo with a concentration of 2 mg / mL 2 CT X In the dispersion, the obtained solution was hydrothermally treated at 120°C for 12h. After filtering with deionized water until the filtrate was neutral, the obtained solid was dried at 60°C for 24h. 0.2 g of the above solid was dissolved in 60 mL of a tris solution with a concentration of 10 mmol / L and stirred for 0.2 h, and 0.2 g of dopamine hydrochloride was added. Under stirring conditions, after polymerization for 12 h, the suspension was filtered with deionized water until the filtrate was neutral, and the obtained solid was dried at 100° C. for 12 h. Finally, the solid was placed in a tube furnace, and under the protection of argon atmosphere, the temperature was raised to 600 °C for 3 h at a heating rate of 2 °C / min to obtain Mo. 2 Molybdenum-based heterostructure material sandwiched by C and carbon.

[0042] figure 2 In order to obtain a sca...

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Abstract

The invention discloses a Mo2C and carbon-coated molybdenum-based heterostructure material as well as a preparation method and application thereof, a molybdenum-based material is constructed on the surface of Mo2CTX in a surface in-situ growth manner, and then a polymer is carbonized on the surface of the material to obtain the Mo2C and carbon-coated molybdenum-based heterostructure material. The material has a three-dimensional structure formed by self-assembly of a two-dimensional sheet structure, and high-conductivity Mo2C and carbon are respectively introduced to two sides of a molybdenum-based material to construct an interlayer-shaped molybdenum-based heterostructure, so that the conductivity of the heterostructure material can be improved, and the volume change of the heterostructure material in the charge-discharge process can be buffered.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a Mo 2 Molybdenum-based heterostructure material sandwiched by C and carbon, and preparation method and application thereof. Background technique [0002] Lithium-ion batteries have attracted much attention due to their high energy density, long cycle life, and environmental friendliness. However, the low specific capacity of commercial graphite anodes limits the development of high-energy-density Li-ion batteries. Molybdenum-based materials have the advantages of high specific capacity and low price, and are considered to be one of the candidate materials to replace graphite anodes. However, the disadvantages of molybdenum-based materials, such as poor electrical conductivity and large volume expansion during charging and discharging, limit their industrial application. [0003] At present, molybdenum-based materials are usually nanosized to shorten the ion diffusion pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/02C01B32/949C01B32/05H01M4/48H01M4/58H01M4/587H01M4/62H01M10/0525B82Y40/00B82Y30/00
CPCC01G39/02C01B32/949C01B32/05H01M4/366H01M4/483H01M4/58H01M4/587H01M4/625H01M10/0525B82Y40/00B82Y30/00C01P2004/80C01P2004/20C01P2004/03C01P2002/72C01P2006/40Y02E60/50Y02E60/10
Inventor 刘贵龙张婷赵运霞毋乃腾郭东磊刘献明
Owner LUOYANG NORMAL UNIV
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