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Three-dimensional ordered macroporous graphene carbon material embedded with MoSx nanosheets, preparation and application

A three-dimensional ordered, nano-sheet technology, applied in active material electrodes, electrical components, electrochemical generators, etc., can solve problems such as flexible regulation of difficult physical and chemical properties

Active Publication Date: 2021-09-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, van der Waals heterojunctions are currently mainly obtained by layer-by-layer self-assembly in the liquid phase or on flat substrates by vapor-phase chemical deposition, and it is difficult to flexibly control the physical and chemical properties of materials for specific application requirements.

Method used

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  • Three-dimensional ordered macroporous graphene carbon material embedded with MoSx nanosheets, preparation and application
  • Three-dimensional ordered macroporous graphene carbon material embedded with MoSx nanosheets, preparation and application

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Experimental program
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Effect test

Embodiment 1

[0025] First, add 0.2mol nickel nitrate and 0.1mol citric acid into 100ml deionized water, stir to form a homogeneous solution; secondly, weigh 10g polymethyl methacrylate (PMMA) microsphere template and add it to the above solution, and let it stand for 12h Suction filtration; then, put the impregnated precursor into a 50°C drying oven to dry; finally, place it in a tube furnace and roast it in an argon atmosphere, and raise the temperature to 500°C at a rate of 5°C / min and keep it warm for 0.5 h, Three-dimensional ordered macroporous structure carbon material 3DOM NiG was obtained after natural cooling to room temperature. A certain amount of 3DOM NiG was weighed as a carbon matrix and added to an aqueous solution of ammonium tetrathiomolybdate (20 wt.% of the former), and transferred to a reactor for hydrothermal reaction at 200°C for 12 hours. After the reaction was complete, the obtained material was taken out and washed three times with deionized water (centrifuged at 40...

Embodiment 2

[0027] in an argon-protected glove box (H 2 O2x / 3DOM NiG composite material, conductive carbon black and PVDF are mixed and ground at a mass ratio of 8:1:1 until the components are uniform, then NMP solution is added and stirred evenly, and then the negative electrode slurry is applied on the copper foil with a scraper, and put Dry in an oven at 80°C, and then use a punching machine to obtain pole pieces. Lithium foil is used as the counter electrode, PP is used as the diaphragm, and LiPF with a concentration of 1mol / L 6 The solution is an electrolyte (the solvent is a mixture of EC and DE with a volume ratio of 1:1), and a button-type lithium-ion test battery is assembled. The electrochemical performance test was carried out at room temperature, and the voltage range was 0.01-3.0V. according to figure 2 Test results, when the current density is 0.1A / g, 0.2A / g, 0.5A / g, 1A / g and 2A / g, the prepared 20%-ST-MoS x The average reversible specific capacities of / 3DOM NiG compos...

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Abstract

The invention discloses a three-dimensional ordered macroporous graphene carbon material embedded with MoSx nanosheets, and preparation and application thereof, and belongs to the field of functional nano composite materials. The target material provided by the invention is mainly prepared by a template-hydrothermal combined method: (1) a first step: fully dipping a polymethyl methacrylate microsphere template in a nickel nitrate precursor solution, carrying out suction filtration, drying, roasting in an inert atmosphere, and cooling to room temperature to obtain three-dimensional ordered macroporous graphene carbon as a matrix; and (2) a second step: immersing the obtained three-dimensional carbon matrix into an ammonium molybdate precursor solution, and then carrying out hydrothermal treatment at 200 DEG C to obtain the MoSx nanosheet embedded three-dimensional ordered macroporous carbon material after the reaction is finished. The composite material has the advantages of being high in specific surface area, good in conductivity, uniform in MoSx nanosheet dispersion, free of agglomeration, stable in structure and the like, and shows excellent reversible specific capacity and good cycling stability when being used for a negative electrode of a lithium ion battery.

Description

technical field [0001] The invention relates to an embedded MoS x The three-dimensional ordered macroporous graphene-like carbon material of nanosheets and its preparation and application belong to the field of functional nanocomposite materials. Background technique [0002] With the rapid development of electronic products and electric vehicle industry, people put forward higher requirements on the performance of energy storage devices. The commercial graphite negative electrode capacity of lithium-ion batteries is limited (372mAh / g), and it is urgent to develop a new generation of negative electrode materials with better performance. In recent years, molybdenum disulfide has attracted extensive attention in the field of electrochemical energy storage and conversion due to its layered structure similar to graphite materials, higher lithium storage capacity (670mAh / g) and lower raw material cost. However, when molybdenum disulfide is used alone as the anode material of li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/0525
CPCH01M4/5815H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 吉科猛王疆李炜旗朱敏杰刘召召刘心宇吴梦倩段晶莹陈明鸣王成扬
Owner TIANJIN UNIV
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