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Preparation method and application of graphene-loaded high-conductivity molybdenum sulfide nanoflower material

A graphene, high-conductivity technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems that affect the advantages of high energy density, low sulfur content, and poor rate performance of lithium-sulfur batteries , achieving good cycle stability and excellent Coulombic efficiency

Active Publication Date: 2021-02-26
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the actual sulfur content of these current sulfur cathode materials is low (<70wt%), which seriously affects the advantages of lithium-sulfur batteries in terms of high energy density.
Moreover, the high sulfur-loaded electrode has low sulfur utilization rate, poor rate performance, severe shuttle effect and rapid capacity fading during long cycle during charge and discharge.
[0004] However, it is difficult to completely solve these problems in Li-S batteries only through the modification of the sulfur cathode side or the modification of the separator side.

Method used

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  • Preparation method and application of graphene-loaded high-conductivity molybdenum sulfide nanoflower material
  • Preparation method and application of graphene-loaded high-conductivity molybdenum sulfide nanoflower material
  • Preparation method and application of graphene-loaded high-conductivity molybdenum sulfide nanoflower material

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Embodiment 1

[0035] This embodiment provides a method for preparing an FM@G material, which specifically includes the following steps:

[0036] 30 mg graphene oxide was sonicated in 50 mL DMF until completely dispersed, and 30 mg (NH 4 ) 2 MoS 4 and 30 mg urea, after ultrasonic treatment for 1 hour, add 100 μL hydrazine hydrate, stir for 30 minutes, ultrasonic treatment for 20 minutes to form a uniform suspension, place the suspension at 180 ° C for 10 hours, cool, centrifugal filter, use The FM@G material was obtained after washing and drying with deionized water and ethanol.

[0037] The TEM image of FM@G prepared in this example shows that the MoS 2 After loading on graphene, the two-dimensional nanosheet structure is well maintained, and the MoS 2 Nanoflowers are in close contact with the graphene surface, which is beneficial for electron transfer in graphene and MoS 2 freely transfer between them. The molybdenum sulfide nanoflowers are uniformly distributed on the graphene surfa...

Embodiment 2

[0039] This embodiment provides a preparation method of FM@G-PP modified diaphragm material, which specifically includes the following steps:

[0040] Add 16 mg FM@G and 2 mg PVDF to 18 mL ethanol solution and sonicate for 45 min at room temperature. After the end of ultrasonication, the dispersion was stirred for 5 minutes, and the resulting dispersion was vacuum filtered to one side of the commercial PP membrane. The resulting FM@G-coated separator was dried under vacuum at 40 °C for 36 h to obtain the FM@G / PP separator material.

Embodiment 3

[0042] This embodiment provides a preparation method for loading sulfur on a graphene-loaded highly conductive molybdenum sulfide nanoflower material, which specifically includes the following steps:

[0043]Disperse the FM@G material and sulfur powder prepared in Example 1 in the carbon disulfide solution at a mass ratio of 3:7, stir until the carbon disulfide is completely evaporated, and react at 150-180°C to obtain the FM@G / 70S composite material , that is, the graphene-supported highly conductive molybdenum sulfide nanoflower material.

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Abstract

The invention relates to a preparation method of a high-conductivity composite material (FM-coating G) with molybdenum sulfide nanoflowers uniformly loaded on graphene and system modification of the high-conductivity composite material for a lithium-sulfur battery. The preparation method comprises the following steps: dispersing a certain amount of graphene oxide in a DMF solution, adding a certain amount of ammonium tetrathiomolybdate and urea into the dispersion liquid, carrying out ultrasonic treatment, adding a hydrazine hydrate solution, stirring the obtained mixed solution, carrying outuniform ultrasonic treatment, and carrying out a solvothermal reaction to prepare the FM-coating G composite material. An FM-coating G / S positive electrode material is prepared from the quantitative FM-coating G and elemental sulfur through a hot melt diffusion method. The FM-coating G ethanol dispersion liquid is filtered to a PP diaphragm under vacuum, thereby obtaining the FM-coating G-PP modified diaphragm. The obtained material has an efficient synergistic effect when being applied to a positive electrode and a diaphragm of a lithium-sulfur battery, and the adsorption / catalysis capabilityon polysulfide is enhanced, so that the battery has excellent cycle performance and high energy density.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries. More specifically, it relates to the preparation of a highly conductive flower-like molybdenum sulfide nanocomposite uniformly loaded on graphene and its use in positive electrode modification and separator modification of lithium-sulfur batteries. Background technique [0002] The growing demand for portable electronic devices, electric vehicles, and large-scale smart grids has driven the rapid development of energy storage technologies. Lithium-sulfur (Li-S) batteries are considered to be one of the most promising next-generation energy storage systems due to their high theoretical energy density and cost-effectiveness. In order to better realize the commercial application of Li-S batteries, cathode materials with high sulfur content are essential. However, some problems often arise when scaling up the sulfur loading of Li-S batteries, such as poor rate performance and poor c...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/58H01M50/403H01M50/446H01M4/136H01M4/1397H01M10/052B82Y30/00B82Y40/00
CPCH01M4/5815H01M4/625H01M4/628H01M4/1397H01M4/136H01M10/052B82Y30/00B82Y40/00H01M2004/028H01M2004/021Y02E60/10
Inventor 程志斌陈毅龙潘慧杨义锶项生昌张章静
Owner FUJIAN NORMAL UNIV
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