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Nanometer tin diselenide/graphene composite material and its preparation method and use

A technology of tin diselenide and composite materials, applied in the field of materials science, can solve the problems of difficult to control the shape, lack of synthesis methods, high toxicity and high pressure, etc., and achieve the effect of uniform shape, small size, and prevention of agglomeration

Active Publication Date: 2016-02-03
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the layered nature of tin diselenide and tin selenide, these methods usually can only obtain flake or plate-like tin selenide nanostructures and it is difficult to control the morphology
At the same time, this method requires the use of highly toxic organic selenium sources and the high pressure generated by closed heating during the reaction cannot be ignored. These problems greatly limit the application of the above method
[0005] In summary, there are still many defects in the synthesis method of nano-tin-selenium compound / carbon composite material and the products obtained, and there is still a lack of a safe and efficient synthesis method to obtain highly stable products

Method used

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  • Nanometer tin diselenide/graphene composite material and its preparation method and use
  • Nanometer tin diselenide/graphene composite material and its preparation method and use
  • Nanometer tin diselenide/graphene composite material and its preparation method and use

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Experimental program
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Effect test

Embodiment 1

[0072] The preparation of embodiment 1 sample

[0073] a) Mix tin powder, selenium powder, and ionic liquid according to a certain ratio of substances, seal them in a quartz microwave reaction tube with a volume of 10 mL, and react at a constant temperature at a certain temperature under microwave heating conditions for a period of time, and then naturally cool down to room temperature , add 15mL of N-methylpyrrolidone to disperse, fully stir and filter, keep the filtrate to obtain the precursor solution containing selenostannate nanoparticles.

[0074] b) Disperse 200 mg of graphene oxide powder in 5 mL of deionized water, ultrasonically disperse and add 20 mL of a mixed solution of ethanol and NMP (the volume ratio of ethanol to NMP is 1:1), and ultrasonically again for 30 min to make the dispersion uniform.

[0075] c) Add the precursor solution prepared in step a) dropwise into the dispersion obtained in step b) while stirring vigorously, stir vigorously for 30 minutes to ...

Embodiment 2

[0080] The characterization of embodiment 2 sample

[0081] Adopt X-ray powder diffraction to the sample 1 that obtains in embodiment 1 # ~Sample 5 # Characterized to sample 1 # is a typical representative, and its XRD spectrum is as follows figure 2 shown, sample 2 # ~Sample 5 # The XRD spectrum and figure 2 Similar, that is, the positions of the diffraction peaks are basically the same, and the peak intensities of different samples are slightly different. Depend on figure 2 It can be seen that the diffraction peaks of the obtained product are consistent with those of crystalline SnSe 2 The standard diffraction spectra of the phases are basically consistent, and there are still some amorphous C phases, which should come from the thermally reduced graphene oxide substrate. According to this, it can be proved that the obtained product is SnSe 2 Composite products with graphene.

[0082] Adopt X-ray photoelectron energy spectrogram (XPS) to the sample 1 that obtains...

Embodiment 3

[0086] Embodiment 3 is tested to lithium ion cyclic voltammetry

[0087] Take sample 1 # As a typical representative, its cyclic voltammetry curve is tested, as follows:

[0088] The prepared sample, conductive carbon black, and binder polyvinylidene fluoride (abbreviated as PVDF, the mass percentage of polyvinylidene fluoride in the binder is 10%) are formulated in a weight ratio of 8:1:1 After making slurry. Evenly coated on the surface of copper foil of the negative electrode current collector with a thickness of 9 μm, then dried under vacuum at 120°C, sliced, pressed into tablets, and weighed to obtain the negative electrode sheet. Ethylene carbonate (abbreviated as EC) and diethyl carbonate (abbreviated as DEC) were uniformly mixed at a volume ratio of EC:DEC=1:1 to obtain a non-aqueous organic solvent. Addition of LiPF to non-aqueous organic solvents 6 , to get LiPF 6 A solution with a concentration of 1mol / L is the electrolyte. A half-cell was assembled in a glove...

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Abstract

The invention discloses a nanometer tin diselenide / graphene composite material. The nanometer tin diselenide / graphene composite material is characterized in that tin diselenide particles with the average particle size of 3-10nm grow on the graphene surface. Nanometer tin diselenide and graphene have high binding strength, tin diselenide nanometer particles have good crystallization structures, graphene slice layers are disorderedly stacked to form a 3D skeleton, and nano-scale tunnels and a good charge transmission network are provided. The nanometer tin diselenide / graphene composite material is used as a cell cathode material and has good charge and discharge performances and stability. The invention also discloses a preparation method of the nanometer tin diselenide / graphene composite material. In synthesis, an ionic liquid is used and through improvement of binding strength of a metal sulfur nanometer structure and a carbon material, effective compounding of the carbon material and tin diselenide is realized and a high-performance lithium ion battery and sodion battery cathode material is obtained.

Description

technical field [0001] The application relates to a nanometer tin diselenide / graphene composite material, a preparation method of the material and its application in the field of ion batteries, belonging to the field of materials science. Background technique [0002] At present, commercial secondary lithium-ion batteries usually use graphite as the negative electrode material of the battery, but its low theoretical capacity (372mAh / g) can no longer meet people's needs for large-capacity, high-density energy storage devices, so the development of high-capacity Non-carbon electrode active materials are particularly important. [0003] Among the existing non-carbon electrode active materials, inorganic compounds with layered structures have attracted attention because they are beneficial to the reversible intercalation / deintercalation of lithium ions. Tin selenide (tin diselenide or stannous selenide), as a typical layered tin-based chalcogenide, exhibits good electrochemical...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/0525H01M10/054B82Y30/00
CPCB82Y30/00H01M4/366H01M4/581H01M4/587H01M10/0525H01M10/054H01M2004/021Y02E60/10
Inventor 杜乘风李建荣黄小荥
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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