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Method for preparing composite material by embedding MoS2 nanosheets in carbon substrate and application of composite material

A technology of nanocomposite materials and composite materials, which is applied in the field of preparation of MoS2 nanosheets embedded in carbon substrate composite materials, can solve the problems of poor cycle stability, large volume expansion, poor conductivity, etc., and achieves simple methods, short synthesis time, The effect of reducing production costs

Active Publication Date: 2019-06-18
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, molybdenum disulfide has poor electrical conductivity, large volume expansion during charge and discharge, and the transformation reaction (MoS 2 +4Li+ / Na + +4e - →Mo+2Li 2 S / Na 2 S) causes structural deterioration and other disadvantages, which will lead to poor cycle stability

Method used

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  • Method for preparing composite material by embedding MoS2 nanosheets in carbon substrate and application of composite material
  • Method for preparing composite material by embedding MoS2 nanosheets in carbon substrate and application of composite material
  • Method for preparing composite material by embedding MoS2 nanosheets in carbon substrate and application of composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1 molybdenum metal reaction chamber to MoS 2 / C nanocomposite preparation

[0050] This example shows that molybdenum metal is the reaction chamber, and the protective atmosphere is argon on MoS 2 / C nanocomposite preparation, the specific preparation process is as follows:

[0051] The solution of ammonium tetrathiomolybdate and dimethylformamide with a mass ratio of 2:3 was used as the reaction precursor, the heating rate was 10°C / min, the holding time was 1h, and the reaction temperature was 500°C to prepare MoS 2 / C nanocomposites.

[0052] figure 1 is MoS obtained in a molybdenum metal reaction chamber 2 SEM images of / C nanocomposites.

[0053] from figure 1 It can be seen that MoS 2 / C nanocomposites have been formed.

Embodiment 2

[0054] Example 2 MoS at 700°C 2 / C nanocomposite preparation

[0055] This example demonstrates the effect of reaction temperature 700°C on MoS 2 The preparation of / C nanocomposite material, reaction cavity and protective atmosphere are the same as embodiment 1, and concrete preparation process is as follows:

[0056] A solution with a mass ratio of ammonium tetrathiomolybdate and dimethylformamide of 1:2 was used as the reaction precursor, the heating rate was 10°C / min, and the holding time was 0.5h.

[0057] figure 2 is MoS obtained at 700°C 2 / C nanocomposite SEM photographs.

[0058] from figure 2 It can be seen that MoS 2 / C nanocomposites have been formed.

Embodiment 3 4

[0059] Example 3 The mass ratio of ammonium tetrathiomolybdate to dimethylformamide is 2:3 to prepare MoS 2 / C Nanocomposite

[0060] This example demonstrates that a solution of ammonium tetrathiomolybdate and dimethylformamide with a mass ratio of 2:3 is used as a reaction precursor to prepare MoS 2 / C nanocomposite material, reaction chamber and protective atmosphere are the same as in Example 1, and the specific preparation process is as follows:

[0061] 1.5g of the reaction precursor, under the conditions of 600°C and a heating rate of 10°C / min, the holding time is 0.5h.

[0062] image 3 MoS obtained from a solution of ammonium tetrathiomolybdate and dimethylformamide with a mass ratio of 2:3 as a reaction precursor 2 / C nanocomposite SEM photographs.

[0063] from image 3 It can be seen that MoS 2 / C nanocomposites have been formed.

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Abstract

The invention discloses a method for preparing a composite material by embedding MoS2 nanosheets in a carbon substrate and an application of the composite material and belongs to the technical field of new materials. The method comprises the steps of by adopting an ammonium tetrathiomolybdate solution dissolved in dimethylformamide as a reaction precursor, putting in a self-made reaction device, sealing, putting in a heating furnace capable of introducing protective gas, heating to an appropriate temperature, decomposing the precursor into gas and generating high pressure to prepare the MoS2 / Cnanocomposite material under high pressure. The MoS2 / C nanocomposite material is composed of a microstructure formed by uniformly embedding the MoS2 nanosheets in the nitrogen-oxygen co-doped carbonsubstrate; and the MoS2 / C nanocomposite material serves as a negative electrode material for lithium ion and sodium ion batteries. The method has the beneficial effects that the method is simple in process, abundant in raw materials and low in cost; when the MoS2 / C nanocomposite material prepared by adopting the method serves as the negative electrode material for the lithium ion and sodium ion batteries, the cycle performance and the rate performance of the batteries can be improved; and therefore, the method is suitable for large-scale popularization and has a good application prospect.

Description

technical field [0001] The invention relates to the field of new technology materials, in particular to a kind of MoS 2 Preparation method and application of nanosheet embedded in carbon substrate composite material. Background technique [0002] With the gradual depletion of natural resources such as coal and oil, people began to pay attention to new energy sources (solar energy, wind energy, geothermal energy and hydrogen energy, etc.), but these new energy sources have the characteristics of intermittent, random and low energy density, so need Develop energy storage devices to store the intermittent energy obtained, and rechargeable batteries are widely used as the most effective energy storage devices at present. Among all the rechargeable batteries, lithium-ion batteries and sodium-ion batteries have become the focus. [0003] Since the development of lithium-ion batteries, people have been trying to improve their energy density and power density to meet their applica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525H01M10/054
CPCY02E60/10
Inventor 于杰韩美胜
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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