Molybdenum disulfide-three-dimensional graphene composite material

A technology of molybdenum disulfide and composite materials, which is applied in the field of nanocomposite materials and its applications, can solve the problems of electrode damage, unstable graphene bonding, long reaction time, etc. Fast heating effect

Pending Publication Date: 2019-06-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of molybdenum disulfide/graphene nanocomposites in the prior art, most of them use hydrothermal method, or solvents are needed in the synthesis process, the reaction time is generally long, and the products require complicated separation and post-treatment processes. MoS2 in synthetic materials 2 The combination with graphene is unstable, and

Method used

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  • Molybdenum disulfide-three-dimensional graphene composite material
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  • Molybdenum disulfide-three-dimensional graphene composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Preparation of graphene oxide: slowly add 100mL of 98% concentrated sulfuric acid into a 500mL dry three-necked flask, and place the three-necked flask on a magnetic stirrer for ice bath cooling. Add 2.0 g of natural graphite flakes (180 mesh) under rapid stirring, and when the temperature of the reaction solution drops to about 0° C., slowly add 4.0 g of sodium nitrate, and continue stirring for 2 h. Then slowly add 10 g of potassium permanganate in batches within 1 h, keep stirring for 2 h, and control the reaction temperature below 10°C. Then the three-neck flask was moved into a water bath at 40° C., and the stirring reaction was continued for 2 h. Subsequently, 200 mL of warm deionized water was slowly added, and the temperature of the reaction solution was kept within 100 °C. React at a constant temperature of 98°C until the reaction solution turns bright yellow. Add 20 mL of 30% hydrogen peroxide to the reaction liquid, and keep stirring to make it fully react....

Embodiment 2

[0033] The preparation method of graphene oxide and three-dimensional graphene airgel is the same as embodiment 1

[0034] Preparation of molybdenum disulfide-three-dimensional graphene composites: mix sulfur powder, ammonium paramolybdate and three-dimensional graphene airgel at a mass ratio of 1:1:4, place the mixture in an agate tank filled with nitrogen, and use Ball mill ball milling, the mass ratio of balls to materials is 3:1, the rotation speed is 400rpm, after 1 hour of ball milling, cool naturally to room temperature to collect the product. The ball-milled material was put into a reaction tube, placed in a microwave reaction chamber, and purged with argon gas at 100 mL / min for 1 h. Microwave with 600W power for 10min. Cool to room temperature under an Ar atmosphere to obtain a molybdenum disulfide-three-dimensional graphene composite material.

Embodiment 3

[0036] The preparation method of graphene oxide and three-dimensional graphene airgel is the same as embodiment 1

[0037] Preparation of molybdenum disulfide-three-dimensional graphene composites: mix sulfur powder, ammonium paramolybdate and three-dimensional graphene airgel at a mass ratio of 1:2:4, place the mixture in an agate tank filled with nitrogen, and use Ball mill ball milling, the mass ratio of balls to materials is 3:1, the rotation speed is 400rpm, after 1 hour of ball milling, cool naturally to room temperature to collect the product. The ball-milled material was put into a reaction tube, placed in a microwave reaction chamber, and purged with argon gas at 100 mL / min for 1 h. Microwave with 600W power for 10min. Cool to room temperature under an Ar atmosphere to obtain a molybdenum disulfide-three-dimensional graphene composite material.

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Abstract

The invention discloses a molybdenum disulfide-three-dimensional graphene composite material. The molybdenum disulfide-three-dimensional graphene composite material is prepared through the method thatgraphene oxide and L-cysteine are utilized to prepare three-dimensional graphene aerogel, molybdenum salt, sulfur powder and the three-dimensional graphene aerogel are placed in a microwave reactioncavity after being ground and are heated for 10-60min at the microwave power of 300-1,000W, and then the molybdenum disulfide-three-dimensional graphene composite material is obtained. According to the material, under the microwave heating condition, graphene oxide is thermally reduced into graphene, and meanwhile generated MoS<2> directly grows in situ on the surface of the graphene; microwave heating is high in speed and uniform, so that an MoS<2> nanosheet and the graphene are firmly combined, particle accumulation cannot be easily caused, material synthesis time is greatly shortened, and the problem that the graphene and MoS<2> aggregate under a long-term heating condition is relieved; compared with a two-dimensional structure, the graphene of the three-dimensional structure is not prone to stacking and aggregation in the compositing process, so that play of excellent properties of the graphene is better guaranteed; and being a lithium-ion battery cathode material, the composite material shows good circulation stability and rate capability.

Description

technical field [0001] The invention relates to a molybdenum disulfide-three-dimensional graphene structure lithium battery negative electrode material, and provides a preparation method thereof, belonging to the technical field of nanocomposite materials and their applications. Background technique [0002] Lithium-ion batteries are widely used in modern electric energy storage systems such as mobile phones and electric vehicles due to their high energy density, high operating voltage and long service life. The electrochemical properties of negative electrode materials directly affect the overall performance of lithium-ion batteries. Graphite is widely used as a negative electrode material for lithium-ion batteries due to its high Coulombic efficiency, good cycle stability, and abundant reserves in nature. However, its low specific capacity (372mAh g -1 ) and poor rate performance cannot meet the needs of future portable devices and electric vehicles. Therefore, there is ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/0525
CPCY02E60/10
Inventor 郭金张会成王少军凌凤香
Owner CHINA PETROLEUM & CHEM CORP
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