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Molybdenum sulfide/carbon composite material and preparation method and application thereof

A carbon composite material, molybdenum sulfide technology, applied in electrochemical generators, active material electrodes, electrical components, etc., can solve the problems of high price and difficult to disperse, and achieve the effects of simple operation, mild reaction conditions and lower production costs.

Inactive Publication Date: 2017-06-30
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] It can be seen from the above that in the prior art, the carbon materials commonly used for compounding with molybdenum sulfide are mostly carbon nanotubes, organic carbon sources, graphene, etc., and most of the above-mentioned carbon materials are expensive and difficult to disperse, and they are unavoidable during the preparation process. The need for co-templating agents or surfactants

Method used

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  • Molybdenum sulfide/carbon composite material and preparation method and application thereof
  • Molybdenum sulfide/carbon composite material and preparation method and application thereof
  • Molybdenum sulfide/carbon composite material and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0056] (1) Molybdenum acetylacetonate, sodium sulfide and glucose are mixed and dissolved in deionized water according to the molar ratio of molybdenum / sulfur / carbon of 1:3:10, and after stirring evenly, a mixed solution having a molybdenum ion concentration of 0.01mol / L is obtained; Add cotton cloth to the mixed solution at a mass ratio of 1:10 according to the molybdenum source / cotton carbon source to obtain the mixture;

[0057] (2) Transfer the mixture obtained in step (1) to a closed reaction kettle, and heat it in an oven at 180° C. for 48 hours; centrifuge the hydroheated product, and wash it to obtain a precursor of molybdenum sulfide / carbon material;

[0058] (3) The precursor obtained in step (2) was heat-treated at 750° C. for 3 hours to obtain a molybdenum sulfide / carbon composite material.

[0059] Carry out SEM characterization to the molybdenum sulfide / carbon composite material that this implementation obtains, as figure 1 and figure 2 As shown, molybdenum su...

Embodiment 2

[0063] (1) Sodium molybdate, thiourea and starch are mixed and dissolved in deionized water according to the molar ratio of molybdenum / sulfur / carbon of 1:10:20, and after stirring evenly, a mixed solution having a molybdenum ion concentration of 0.2mol / L is obtained; According to the mass ratio of molybdenum source / cotton carbon source being 1:20, clothes are added to the mixed solution to obtain the mixture;

[0064] (2) Transfer the mixture obtained in step (1) to a closed reaction kettle, and heat it in an oven at 210° C. for 10 hours; filter the hydroheated product, and wash it to obtain a precursor of molybdenum sulfide / carbon material;

[0065] (3) The precursor obtained in step (2) was heat-treated at 500° C. for 10 h to obtain a molybdenum sulfide / carbon composite material.

[0066] The SEM characterization of the molybdenum sulfide / carbon composite material obtained in this implementation shows that the molybdenum sulfide presents an ordered nano-sheet structure, unif...

Embodiment 3

[0069] (1) Ammonium molybdate, sodium molybdate, sodium thiosulfate and sucrose are mixed and dissolved in deionized water according to the molar ratio of molybdenum / sulfur / carbon of 1:1:3 (ammonium molybdate and sodium molybdate are in any proportion ), stirring evenly to obtain a mixed solution with a molybdenum ion concentration of 0.5mol / L; adding cotton cloth to the mixed solution at a mass ratio of 1:40 according to the molybdenum source / cotton carbon source, to obtain a mixture;

[0070] (2) Transfer the mixture obtained in step (1) to a closed reaction kettle, and heat it in an oven at 250° C. for 8 hours; centrifuge and wash the product after hydroheating to obtain a precursor of molybdenum sulfide / carbon material;

[0071] (3) heat-treating the precursor obtained in step (2) at 900° C. for 1 h to obtain a molybdenum sulfide / carbon composite material.

[0072] The SEM characterization of the molybdenum sulfide / carbon composite material obtained in this implementation ...

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Abstract

The invention relates to a molybdenum sulfide / carbon composite material and a preparation method and application thereof. A mixed solution including a molybdenum source, a sulfur source and an organic carbon source is mixed with a cotton carbon source, then the obtained mixture is subjected to a hydrothermal reaction, solid is subjected to thermal treatment after solid-liquid separation, and the molybdenum sulfide / carbon composite material is obtained. In the preparation process, waste cotton materials are directly used as the carbon source and formworks or cotton materials are mainly used as the carbon source and the formworks, so that the material is environmentally friendly, a template agent is not needed, and the production cost is greatly reduced. The obtained molybdenum sulfide / carbon composite material has special appearance and structure, and has excellent electrochemical properties when used as a lithium ion battery negative pole material, and the first charge and discharge reversible specific capacity is 800-1400 mAh / g. The material is simple in process, mild in condition, suitable for industrial production and wide in application prospect.

Description

technical field [0001] The invention relates to the field of nanomaterial preparation, in particular to a molybdenum sulfide / carbon composite material and its preparation method and application. Background technique [0002] Molybdenum sulfide (MoS 2 ) has a graphene-like two-dimensional layered structure, and the molybdenum-sulfur layers are connected by weak van der Waals forces. The larger interlayer spacing (0.62nm) is not only beneficial to the intercalation and extraction of lithium ions, but also can be used as a buffer area to alleviate the volume change of the material, making it an ideal anode material for lithium-ion batteries. However, during the cycle, the complete reaction of MoS2 to Mo and LiS will cause a large volume change and reduce its cycle stability. In addition, due to the poor intrinsic electronic conductivity of molybdenum disulfide, its rate performance is not good. [0003] In response to these problems, the improvement methods that are often ad...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5815H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 谭强强夏青
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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