Spherical molybdenum disulfide composite material and preparation method and application thereof

A technology of molybdenum disulfide and composite materials, which is applied in the direction of secondary batteries, electrochemical generators, electrical components, etc., can solve the problem of limited improvement in the conductivity of molybdenum disulfide materials, and achieve easy operation, high capacity, and high rate The effect of high capacity

Inactive Publication Date: 2015-06-03
SHENZHEN CAPCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this patent, although the compounding of graphene and molybdenum disulfide improves the comprehensive electrochemical performance of the negative electrode material, it is only a compromise between the advantages and properties of graphene and molybdenum disulfide, and the conductivity of molybdenum disulfide material The improvement effect is limited

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  • Spherical molybdenum disulfide composite material and preparation method and application thereof
  • Spherical molybdenum disulfide composite material and preparation method and application thereof
  • Spherical molybdenum disulfide composite material and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0030] In this example, sodium molybdate and L-cysteine ​​are used as raw materials to prepare molybdenum disulfide by hydrothermal method. The preparation method of the spherical molybdenum disulfide composite material in this example is as follows:

[0031] (1) Mix 20ml 0.04mol / L sodium molybdate aqueous solution and 20ml 0.16mol / L L-cysteine ​​together, transfer to a 50ml polytetrafluoro container, and fix it in a stainless steel reaction kettle Then use an oven to directly heat at 220°C for 12 hours. When the temperature of the reactor naturally drops to 25°C, wash the obtained reactants with water and ethanol three times in sequence, and put the washed samples in an oven at 70°C. Dry for 5 hours to obtain spherical molybdenum disulfide nanospheres;

[0032](2) mixing the spherical molybdenum disulfide nanospheres prepared in step (1) with oleic acid at a weight ratio of 1:20, ultrasonically mixing for 2 hours, centrifuging to remove excess oleic acid, and obtaining molybd...

Embodiment 2

[0038] In this example, 20ml of 0.2mol / L sodium molybdate aqueous solution and 20ml of 0.32mol / L L-cysteine ​​were mixed together to prepare molybdenum disulfide, and all the other steps and conditions were the same as in Example 1.

[0039] The composite material prepared in this example was observed with a scanning electron microscope, and the results showed that the diameter of the amorphous carbon-coated molybdenum disulfide nanospheres in this example was about 350 nanometers, the particle size distribution was uniform, and the thickness of the nanosheets was about 5-8 nanometers. It is measured that in the composite material of this example, the amorphous carbon content accounts for 13.6% of the total weight of the amorphous carbon-coated spherical molybdenum disulfide composite material.

[0040] In this example, the negative electrode material was prepared by the same method as in Example 1, and its electrochemical performance was also tested by using a button cell. The...

Embodiment 3

[0042] In this example, 20ml of 0.1mol / L sodium molybdate aqueous solution and 20ml of 0.16mol / L L-cysteine ​​are mixed together to prepare molybdenum disulfide, and the oven is directly heated at 240°C for 12 hours, that is to say , the hydrothermal reaction temperature was 240°C, and the rest of the steps and conditions were the same as in Example 1.

[0043] A scanning electron microscope was used to observe the composite material prepared in this example. The results showed that the diameter of the amorphous carbon-coated molybdenum disulfide nanospheres in this example was about 400 nanometers, the particle size distribution was uniform, and the thickness of the nanosheets was about 5-8 nanometers. It is measured that in the composite material of this example, the amorphous carbon content accounts for 13.7% of the total weight of the amorphous carbon-coated spherical molybdenum disulfide composite material.

[0044] In this example, the negative electrode material was pre...

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Abstract

The invention discloses a spherical molybdenum disulfide composite material and a preparation method and an application thereof. The preparation method disclosed by the invention comprises the following steps: (1) respectively adding sodium molybdate and L-cysteine in deionized water, mixing uniformly, heating for 8-16 hours, naturally cooling, and alternatively washing with water and ethanol to obtain spherical molybdenum disulfide nano spheres; (2) soaking molybdenum disulfide in oleic acid for 24-72 hours, and centrifuging to remove excessive oleic acid; and (3) heating the soaked molybdenum disulfide in nitrogen or argon for 2-6 hours at 400-1100 DEG C to obtain a spherical molybdenum disulfide composite material coated with amorphous carbon. In the preparation method disclosed by the invention, the oleic acid is used for adsorbing crystal face and annealing to form the amorphous carbon, so that molybdenum disulfide is coated by an amorphous carbon layer, and the preparation method is simple and easy to operate; the prepared molybdenum disulfide composite material has uniform particle size distribution and good conductivity, and has the advantages of high capacity, good cycle stability and high rate capacity and the like, when being used as battery anode.

Description

technical field [0001] The present application relates to the field of negative electrode materials for lithium ion batteries, in particular to a spherical molybdenum disulfide composite material and its preparation method and application. Background technique [0002] With the increasingly prominent energy and environmental issues, electric vehicles and hybrid vehicles are developing rapidly. For this reason, more stringent requirements are placed on the lithium-ion batteries that provide energy. Anode materials are one of the key materials for lithium-ion batteries. The currently researched anode materials mainly include tin-based, silicon-based and carbon materials. At present, commercialized carbon anode materials have advantages such as low charge and discharge voltage platform, but at the same time, they also have defects such as low tap density and electrolyte interaction. Although tin-based and silicon-based anode materials have high capacity, their volume expansi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCH01M4/5815H01M4/583H01M10/0525Y02E60/10
Inventor 郭玮马建民毛玉华
Owner SHENZHEN CAPCHEM TECH
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