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Method for preparing zinc ferrite coated by graphene

A graphene-coated, zinc-ferrite technology, applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of electrical conductivity, toxicity and easy pollution, and high production cost, so as to avoid additives, reduce pollution, and pack uniform effect

Inactive Publication Date: 2013-09-18
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently commonly used coating forms almost all need to be connected by additional chemical bonds, such as amino acid bonds and organic bonds. characteristics

Method used

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  • Method for preparing zinc ferrite coated by graphene
  • Method for preparing zinc ferrite coated by graphene
  • Method for preparing zinc ferrite coated by graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Disperse the graphene oxide nanolayer in ethylene glycol at a concentration of 0.9-1.5 mg / ml, and stir until uniformly dispersed after ultrasonication for 30-40 minutes;

[0029] (2) Add ferric chloride, zinc chloride and urea to the above suspension, the concentration ratio of ferric chloride and zinc chloride is 2:1, wherein the concentration of ferric chloride is 0.1-0.25 mol / L, stir for 0.5-5.0 hours until uniformly dispersed;

[0030] (3) Put the mixed solution into a reaction kettle, and preheat at 80-150° C. for 1.0-4.0 hours to form metal alkoxide nanoparticles, and the nanoparticles are attached to the surface of the graphite oxide nanolayer;

[0031] (4) Raise the temperature to 180-210°C at a heating rate of 3-5°C / min, keep it warm for 22-29 hours, the nanoparticles are assembled, and the attached graphene nanolayer is guided and coated on its surface, centrifuged, washed, The nanoparticle-assembled zinc ferrite hollow spheres coated with graphene were o...

Embodiment 2

[0033] (1) Disperse the graphite oxide nanolayer in ethylene glycol at a concentration of 0.5-1.0 mg / ml, and stir until evenly dispersed after ultrasonication for 40-60 minutes;

[0034] (2) Add ferric chloride, manganese nitrate and urea to the above suspension, the molar concentration ratio of ferric chloride and zinc chloride is 2:1, wherein the concentration of ferric chloride is 0.05-0.15 moles / L, stir for 0.5-5.0 hours until uniformly dispersed;

[0035] (3) Put the mixed solution into a reaction kettle, and preheat at 80-120°C for 1.0-3.0 hours to form metal alkoxide nanoparticles, and the nanoparticles are attached to the surface of the graphene oxide nanolayer;

[0036] (4) Raise the temperature to 170-200°C at a heating rate of 2-3°C / min, keep it warm for 20-25 hours, the nanoparticles are assembled, and the attached graphene nano-layer is guided and coated on its surface, centrifuged, washed, After drying, the nanoparticle-assembled manganese ferrite hollow sphere...

Embodiment 3

[0038] (1) Disperse the graphene oxide nanolayer in ethylene glycol at a concentration of 0.2-1.2 mg / ml, and stir until uniformly dispersed after ultrasonication for 20-40 minutes;

[0039] (2) Add ferric chloride, nickel sulfate and urea to the suspension, the concentration ratio of ferric chloride and zinc chloride is 2:1, wherein the concentration of ferric chloride is 0.07-0.14 moles / liter, stir for 0.5-4.0 hours to disperse evenly; (3) put the mixed solution into the reaction kettle, and preheat for 0.5-5.0 hours at 100-150°C to form metal alkoxide nanoparticles, and the nanoparticles are attached to the graphite oxide ene nanolayer surface;

[0040] (4) Raise the temperature to 190-230°C at a heating rate of 2-5°C / min, keep it warm for 24-30 hours, the nanoparticles are assembled, and the attached graphene nano-layer is guided and coated on its surface, centrifuged, washed, Nanoparticle-assembled nickel ferrite hollow spheres coated with graphene were obtained after d...

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Abstract

The invention discloses a method for preparing a zinc ferrite coated by grapheme. The grapheme coating process is guided by the self-assembly of nano-particles, the zinc ferrite is constituted by the self-assembly of the nano-particles, and the structure of the zinc ferrite is an assembly hollow sphere structure. Ethylene glycol is taken as a solvent, and a graphene oxide nanolayer, ferric chloride, zinc chloride and carbamide are taken as reactants. A dispersed solution is subjected to preheating, so that nano-particles to which graphene oxide is adhered are prepared. The nano-particles are heated for performing solvothermal reaction to enable the nano-particles to be self assembled and enable the graphene oxide to be reduced. After cooling, centrifugal separation, washing and drying, the zinc ferrite coated by grapheme is obtained. The method can be used for preparing a composite coated by the grapheme, wherein the composite coated by the grapheme has the advantages of even coating and controllability of the shape. In addition, the method has the characteristics of simplicity in manufacturing technique, environment friendliness and low cost.

Description

technical field [0001] The invention relates to a method for preparing graphene-coated inorganic functional materials, in particular to a method for coating graphene on the surface of an ultra-fine crystal compound assembled from nanoparticles by using the self-assembly characteristics between nanoparticles, which belongs to the advanced Nanocomposite preparation method technical field. Background technique [0002] Lithium-ion batteries have been widely used in 3C products such as mobile phones, digital cameras, and laptop computers. However, with the vigorous development of industries such as electric vehicles (EV) and hybrid electric vehicles (HEV), people have increasingly proposed lithium-ion batteries. high demands. Traditional carbon anode materials can no longer meet the requirements of high-power lithium-ion batteries due to their low theoretical capacity, poor rate performance, and safety issues. Therefore, it is urgent to develop anode materials with excellent pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCY02E60/10
Inventor 杨治政王慧远王邦勇戚文王栋
Owner JILIN UNIV
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