Molybdenum disulfide/sulfur-doped graphene composite material as well as preparation method and application thereof

A technology of sulfur-doped graphene and molybdenum disulfide, applied in secondary batteries, electrochemical generators, active material electrodes, etc., can solve the problems of poor conductivity and low specific capacity, and achieve increased specific capacity and ionic conductivity. , the effect of expanding the layer spacing

Active Publication Date: 2021-08-10
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the above materials have the disadvantages of poor conductivity and low specific capacity. Therefore, it is urgent to develop a molybdenum disulfide / graphene composite material with high conductivity and high specific capacity.

Method used

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  • Molybdenum disulfide/sulfur-doped graphene composite material as well as preparation method and application thereof
  • Molybdenum disulfide/sulfur-doped graphene composite material as well as preparation method and application thereof
  • Molybdenum disulfide/sulfur-doped graphene composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The present embodiment provides a kind of preparation method of molybdenum disulfide / sulfur-doped graphene composite material, and described preparation method comprises the following steps:

[0066] (1) mix ammonium molybdate, graphene oxide dispersion, dimethyl trisulfide and glucose, and stir to obtain a mixed solution; the concentration of molybdenum ions in the mixed solution is 0.02mol / L; the graphite oxide The mass concentration of alkene dispersion liquid is 2mg / mL; The atomic ratio of sulfur in the dimethyl trisulfide and molybdenum in the mixed solution is 2:1; The carbon atom molar concentration of glucose in the mixed solution is 1mol / L;

[0067] (2) The mixed solution described in step (1) is subjected to a hydrothermal reaction at a temperature of 200° C. for 24 hours in a closed reaction kettle placed in an oven, and the reacted solution is centrifuged and washed to obtain a precursor;

[0068] (3) Put the precursor described in step (2) into a closed rea...

Embodiment 2

[0072] The present embodiment provides a kind of preparation method of molybdenum disulfide / sulfur-doped graphene composite material, and described preparation method comprises the following steps:

[0073] (1) mix ammonium thiomolybdate, graphene oxide dispersion, dimethyl trisulfide and sucrose, and stir to obtain a mixed solution; the concentration of molybdenum ions in the mixed solution is 0.0005mol / L; The mass concentration of the graphene oxide dispersion is 0.1 mg / mL; the atomic ratio of sulfur in the dimethyl trisulfide to molybdenum in the mixed solution is 3:1; the carbon atom molar concentration of sucrose in the mixed solution is 0.0005 mol / L;

[0074] (2) The mixed solution described in step (1) is subjected to a hydrothermal reaction at a temperature of 290° C. for 3 hours in a closed reaction kettle placed in an oven, and the reacted solution is subjected to suction filtration and washing treatment to obtain a precursor;

[0075] (3) Put the precursor describe...

Embodiment 3

[0077] The present embodiment provides a kind of preparation method of molybdenum disulfide / sulfur-doped graphene composite material, and described preparation method comprises the following steps:

[0078] (1) mix molybdenum acetylacetonate, graphene oxide dispersion, dimethyl trisulfide and epoxy resin, and stir to obtain a mixed solution; the concentration of molybdenum ions in the mixed solution is 4mol / L; the oxidation The mass concentration of graphene dispersion liquid is 5mg / mL; The atomic ratio of sulfur in the described dimethyl trisulfide and molybdenum in the mixed solution is 4:1; The carbon atom molar concentration of epoxy resin in the described mixed solution is 2.5 mol / L;

[0079] (2) The mixed solution described in step (1) is subjected to a hydrothermal reaction at a temperature of 110°C for 70 hours in a closed reaction kettle placed in an oven, and the reacted solution is centrifuged and washed to obtain a precursor;

[0080](3) Put the precursor describe...

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Abstract

The invention discloses a molybdenum disulfide/sulfur-doped graphene composite material and a preparation method and application thereof. The molybdenum disulfide/sulfur-doped graphene composite material comprises a carbon layer, molybdenum disulfide and sulfur-doped graphene. The preparation method comprises the following steps: mixing raw materials of molybdenum salt, graphene oxide dispersion liquid, dimethyl trisulfide and an oxygen-containing organic carbon source, then carrying out hydrothermal reaction, and carrying out heat treatment to obtain the molybdenum disulfide/sulfur-doped graphene composite material. The preparation method disclosed by the invention is simple to operate, mild in reaction condition and suitable for industrial production; and according to the molybdenum disulfide/sulfur-doped graphene composite material prepared by the preparation method, the electronic conductivity, the ionic conductivity and the specific capacity are greatly improved, and the cycling stability is good.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation, in particular to a molybdenum disulfide / sulfur-doped graphene composite material and its preparation method and application. Background technique [0002] Molybdenum disulfide (MoS 2 ) is a two-dimensional layered structure, and the molybdenum-sulfur layers are connected by weak van der Waals forces. Lithium / sodium ions can be reversibly intercalated and extracted between layers, and have a high theoretical specific capacity, making them ideal battery anode materials. However, during the charge-discharge process, MoS2 undergoes large volume changes, resulting in poor cycle stability. In addition, the intrinsic electronic conductivity of molybdenum disulfide is poor, and its rate performance is not good. [0003] At present, the performance of electrode materials is mainly improved by constructing special morphology or compounding molybdenum disulfide with a conductive phase. [0004] C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M10/0525H01M10/054
CPCH01M4/5815H01M4/625H01M10/0525H01M10/054H01M2004/027H01M2004/021Y02E60/10
Inventor 谭强强夏青
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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