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Molybdenum sulfide composite material with manganese element loaded on graphene as well as preparation method and application of molybdenum sulfide composite material

A composite material and graphene technology, applied in the direction of molybdenum sulfide, chemical instruments and methods, carbon compounds, etc., can solve the problems that affect the utilization rate of active materials of lithium-sulfur batteries, the poor conductivity of lithium sulfide, and reduce the cycle life. Effects of inhibiting shuttle action, reducing self-impedance, and increasing cycle life

Pending Publication Date: 2022-04-05
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still many bottlenecks in the research and development of lithium-sulfur batteries
First of all, the main electrode material of lithium-sulfur batteries, elemental sulfur and the discharge product lithium sulfide, have poor electrical conductivity, which leads to the performance of the battery itself not as good as theoretically expected.
Secondly, the discharge product lithium sulfide and elemental sulfur have a large difference in volume, and about 80% of the volume shrinks / expands during the discharge / charge process, which may seriously damage the battery structure
Finally, lithium polysulfides produced during battery charge and discharge will dissolve in the electrolyte, and the shuttle effect of polysulfides will affect the utilization of active materials in lithium-sulfur batteries, reducing Coulombic efficiency on the one hand and cycle life on the other.

Method used

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  • Molybdenum sulfide composite material with manganese element loaded on graphene as well as preparation method and application of molybdenum sulfide composite material
  • Molybdenum sulfide composite material with manganese element loaded on graphene as well as preparation method and application of molybdenum sulfide composite material
  • Molybdenum sulfide composite material with manganese element loaded on graphene as well as preparation method and application of molybdenum sulfide composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of graphene oxide dispersion: Weigh 120 mg of graphene oxide powder and disperse it in 30 mL of deionized water, and sonicate for 1 hour.

[0029] (2) Prepare molybdenum sulfide composites loaded with manganese on graphene: weigh 0.91g thiourea and 0.49g (NH 4 ) 6 Mo 7 o 24 Add to the prepared graphene oxide dispersion in (1), and stir for 10 minutes. Weigh 0.25g MnSO 4 ·H 2 O was added to the stirred solution and sonicated for 5 min. The obtained mixed solution was placed in a hydrothermal reaction kettle, filled with nitrogen at room temperature, and then hydrothermally reacted at 180°C for 20 hours, the reaction solution was taken out and cooled to room temperature, and the obtained solid reaction product was centrifugally washed with deionized water for 3 Once again, put the centrifuged product into liquid nitrogen to freeze quickly, and finally place it in a freeze dryer for drying. The freezing temperature is -50°C, the vacuum degree during d...

Embodiment 2

[0035] (1) Preparation of graphene oxide dispersion: Weigh 120 mg of graphene oxide powder and disperse it in 30 mL of deionized water, and sonicate for 1 hour.

[0036] (2) Prepare molybdenum sulfide composites loaded with manganese on graphene: weigh 0.91g thiourea and 0.49g (NH 4 ) 6 Mo 7 o 24 Add to the prepared graphene oxide dispersion in (1), and stir for 10 minutes. Weigh 0.25g MnSO 4 ·H 2 O was added to the stirred solution and sonicated for 5 min. The obtained mixed solution was placed in a hydrothermal reaction kettle, filled with nitrogen at room temperature, and then hydrothermally reacted at 200°C for 20 hours, the reaction solution was taken out and cooled to room temperature, and the obtained solid reaction product was centrifugally washed with deionized water for 3 Once again, put the centrifuged product into liquid nitrogen to freeze quickly, and finally place it in a freeze dryer for drying. The freezing temperature is -50°C, the vacuum degree during d...

Embodiment 3

[0042] (1) Preparation of graphene oxide dispersion: Weigh 120 mg of graphene oxide powder and disperse it in 30 mL of deionized water, and sonicate for 1 hour.

[0043] (2) Prepare molybdenum sulfide composites loaded with manganese on graphene: weigh 0.91g thiourea and 0.49g (NH 4 ) 6 Mo 7 o 24 Add to the prepared graphene oxide dispersion in (1), and stir for 10 minutes. Weigh 0.42g MnSO 4 ·H 2 O was added to the stirred solution and sonicated for 5 min. The obtained mixed solution was placed in a hydrothermal reaction kettle, filled with nitrogen at room temperature, and then hydrothermally reacted at 200°C for 20 hours, the reaction solution was taken out and cooled to room temperature, and the obtained solid reaction product was centrifugally washed with deionized water for 3 Once again, put the centrifuged product into liquid nitrogen to freeze quickly, and finally place it in a freeze dryer for drying. The freezing temperature is -50°C, the vacuum degree during d...

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Abstract

The invention discloses a molybdenum sulfide composite material with manganese element uniformly loaded on graphene, a preparation method and application of the molybdenum sulfide composite material in lithium-sulfur battery diaphragm modification, and belongs to the technical field of lithium-sulfur batteries. The preparation method comprises the following steps: dispersing graphene oxide in water, adding (NH4) 6Mo7O24 and thiourea, uniformly mixing, adding manganese salt, and ultrasonically dispersing uniformly; the preparation method comprises the following steps: adding molybdenum sulfide into a hydrothermal reaction kettle, carrying out hydrothermal reaction at 160-220 DEG C in a nitrogen atmosphere for 15-30 hours, cooling to room temperature, centrifugally washing the obtained solid reaction product with deionized water for 3-5 times, quickly freezing the centrifuged product in liquid nitrogen, and finally freeze-drying in vacuum for 20-30 hours to obtain the molybdenum sulfide composite material. The composite material can be further applied to the lithium-sulfur battery as a modified diaphragm material, and the modified diaphragm material not only can reduce the self impedance of the diaphragm, but also can increase lithium ion channels on the surface of the diaphragm and accelerate the reaction of the battery, so that the overall performance of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a molybdenum sulfide composite material uniformly loaded with manganese on graphene, a preparation method and its application in the modification of lithium-sulfur battery separators. Background technique [0002] Since human beings entered the electrical age, electric energy has greatly changed our daily life. Through the transmission and application of electric power, human beings have achieved rapid industrial development. However, with the growth of population, the brutal expansion of industrial processes, the excessive use of fossil fuels and other problems, environmental problems have gradually affected our lives, and even threatened the survival and development of human beings. People have gradually realized that the development of renewable energy systems based on new energy sources such as wind energy, solar energy, and tidal energy will be a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/194C01G39/06H01M50/403H01M50/431
CPCY02E60/10
Inventor 任家墨徐家宁范勇王莉王宇
Owner JILIN UNIV
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