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Preparation and application method of graphene intercalated molybdenum disulfide composite material

A molybdenum disulfide, composite material technology, applied in graphene, molybdenum sulfide, nanotechnology for materials and surface science, etc., can solve the problem that the reversible capacity and cycle stability of the molybdenum disulfide positive electrode are difficult to meet practical application requirements, space Structural instability, poor hydrophilic layer spacing, etc., to achieve the effects of improving hydrophilicity and electronic/ionic conductivity, improving fast charge and discharge capacity, and high repetition rate

Active Publication Date: 2021-06-01
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Molybdenum disulfide, as a classic two-dimensional layered material, has been widely studied in the field of lithium-ion batteries and sodium-ion batteries, showing good lithium and sodium storage capabilities, but due to poor hydrophilicity and small The interlayer spacing has rarely been exploited as cathode for aqueous Zn-ion batteries
In existing studies, expanding the layer spacing (H.Li, Q.Yang, F.Mo, et al.MoS 2 Nanosheets with expanded interlayer spacing for rechargeable aqueous Zn-ion batteries, Energy Storage Materials, 2019(19): 94-101), oxygen doping (H.Liang, Z.Cao, F.Ming, et al.Aqueous Zinc-Ion Storage in MoS 2 by Tuning the Intercalation Energy, Nano Letters, 2019(19): 3199-3206), making sulfur vacancies (W.Xu, C.Sun, K.Zhao, et al. Defect engineering activating(Boosting) zinc storage capacity of MoS 2 , Energy Storage Materials, 2019(16): 527-534) and other strategies can improve the zinc storage capacity of molybdenum disulfide, but insufficient zinc storage sites and unstable spatial structure make the reversible capacity and cycle stability of the molybdenum disulfide cathode Difficult to meet practical application requirements

Method used

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  • Preparation and application method of graphene intercalated molybdenum disulfide composite material
  • Preparation and application method of graphene intercalated molybdenum disulfide composite material
  • Preparation and application method of graphene intercalated molybdenum disulfide composite material

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Embodiment 1

[0023] 1) Take 10.5mL of n-butyllithium solution with a concentration of 2.4mol / L, add 15mL of anhydrous pentane to dilute the concentration of n-butyllithium solution to 1mol / L, and evenly disperse 2g of commercial molybdenum disulfide in the above solution , continuously stirred for 5 days under an argon atmosphere, then washed three times with anhydrous pentane, and dried naturally for 2 days under negative pressure to obtain lithium molybdenum sulfide; take 100 mg lithium molybdenum sulfide, and react violently with 15 mL of water under ultrasonic conditions for 3 hours, Obtain a uniform exfoliated molybdenum disulfide dispersion A;

[0024] 2) Dissolve 0.5mmol of cetyltrimethylammonium bromide in 8mL of water evenly, add it to solution A, and keep it under ultrasonic conditions for 2 hours; take 14mg of single-layer graphene oxide and disperse it in 20mL of water, add the above mixed solution Ultrasonic treatment for 2 hours again, so that the exfoliated molybdenum disulf...

Embodiment 2

[0032] 1) Take 10.5mL of n-butyllithium solution with a concentration of 2.4mol / L, add 15mL of anhydrous pentane to dilute the concentration of n-butyllithium solution to 1mol / L, and evenly disperse 2g of commercial molybdenum disulfide in the above solution , continuously stirred for 5 days under an argon atmosphere, then washed three times with anhydrous pentane, and dried naturally for 2 days under negative pressure to obtain lithium molybdenum sulfide; take 100 mg lithium molybdenum sulfide, and react violently with 15 mL of water under ultrasonic conditions for 3 hours, Obtain a uniform exfoliated molybdenum disulfide dispersion A;

[0033] 2) Dissolve 0.5mmol cetyltrimethylammonium bromide uniformly in 8mL water, add it to solution A, and keep it under ultrasonic conditions for 2 hours; take 10mg single-layer graphene oxide and disperse it evenly in 20mL water, add the above mixed solution Ultrasonic treatment for 2 hours again, so that the exfoliated molybdenum disulfid...

Embodiment 3

[0037] 1) Take 10.5mL of n-butyllithium solution with a concentration of 2.4mol / L, add 15mL of anhydrous pentane to dilute the concentration of n-butyllithium solution to 1mol / L, and evenly disperse 2g of commercial molybdenum disulfide in the above solution , continuously stirred for 5 days under an argon atmosphere, then washed three times with anhydrous pentane, and dried naturally for 2 days under negative pressure to obtain lithium molybdenum sulfide; take 100 mg lithium molybdenum sulfide, and react violently with 15 mL of water under ultrasonic conditions for 3 hours, Obtain a uniform exfoliated molybdenum disulfide dispersion A;

[0038] 2) Dissolve 0.5mmol of cetyltrimethylammonium bromide in 8mL of water evenly, add it to solution A, and keep it under ultrasonic conditions for 2 hours; take 18mg of single-layer graphene oxide and disperse it in 20mL of water, add the above mixed solution Ultrasonic treatment for 2 hours again, so that the exfoliated molybdenum disulf...

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Abstract

The invention discloses a preparation and application method of a graphene intercalated molybdenum disulfide composite material. The preparation method comprises the following steps: soaking commercial molybdenum disulfide in an n-butyllithium solution, stirring in an argon environment, cleaning, drying to obtain lithium molybdenum sulfide, adding water, and violently reacting to obtain a stripped molybdenum disulfide dispersion liquid A; adding a cationic surface active agent and a single-layer graphene oxide dispersion liquid into the solution A, wherein the molybdenum disulfide layer and the graphene oxide layer are mutually adsorbed; adding a reducing agent, carrying out hydro-thermal treatment, reducing the graphene oxide into graphene, and embedding the graphene into molybdenum disulfide layers; and washing and freeze-drying to obtain the graphene intercalated molybdenum disulfide composite material. The method has the advantages that repeatability is good, and reaction conditions are easy to control. The obtained material is a micron flower assembled by composite nanosheets with a sandwich structure, wherein the thickness of the nanosheets is 10-20 nm, the interlayer spacing of molybdenum disulfide is expanded to 1.16 nm, the hydrophilicity is good, rapid and stable deintercalation of hydrated zinc ions is facilitated, and the zinc storage capacity, the rate capability and the cycling stability are remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of water-based zinc-ion batteries, and in particular relates to a preparation and application method of a graphene-intercalated molybdenum disulfide composite material. Background technique [0002] In recent years, with the rapid development of smart grids and electronic products, human demand for intermittent renewable clean energy (such as solar energy, tidal energy, wind energy, and geothermal energy) is increasing, and it is imperative to develop large-scale energy storage devices. Aqueous zinc-ion batteries have great prospects in the field of large-scale energy storage due to their high safety, low cost, high theoretical capacity, and easy assembly. However, the strong solvation of zinc ions and the strong electrostatic interaction between divalent charges and cathode materials limit the diffusion kinetics of zinc ions in cathode materials, resulting in lower zinc storage capacity or poor cycle stabi...

Claims

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Application Information

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IPC IPC(8): C01G39/06C01B32/184H01M4/58H01M4/62H01M10/36B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00C01G39/06C01P2004/24C01P2004/45C01P2004/64C01P2004/80C01P2006/40C01B32/184H01M4/5815H01M4/625H01M10/36Y02E60/10
Inventor 刘永畅李平李省伟曲选辉
Owner UNIV OF SCI & TECH BEIJING
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