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Indium selenide/nitrogen-doped reduced graphene oxide composite material as well as preparation method and application thereof

A composite material and graphene technology, applied in the direction of metal selenide/telluride, selenium/telluride compound, chemical instruments and methods, etc., can solve the problems of low capacity retention, poor conductivity, large volume change, etc., to improve electronic Transport rate, effect of good electrochemical lithium storage activity

Active Publication Date: 2020-11-27
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, metal chalcogenides still have some problems as LIBs anode materials: poor conductivity, large volume change, low capacity retention, etc.

Method used

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  • Indium selenide/nitrogen-doped reduced graphene oxide composite material as well as preparation method and application thereof
  • Indium selenide/nitrogen-doped reduced graphene oxide composite material as well as preparation method and application thereof
  • Indium selenide/nitrogen-doped reduced graphene oxide composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] sample preparation

[0093] a) Mix indium powder, selenium powder, and ionic liquid (1-butyl-2,3-dimethylimidazole chloride) according to the ratio of 1:1.7:4.5, add to 20mL Biotage quartz microwave In the reaction tube and sealed, heated to 150°C under microwave conditions for 5 minutes, then heated at a constant temperature of 180°C for 45 minutes, cooled to room temperature naturally, and added 15mL of N-methylpyrrolidone (NMP) under the condition of heating in a water bath at 100°C Disperse to obtain a precursor dispersion liquid containing indium selenate nanoparticles, and the concentration of the precursor in the dispersion liquid is 0.51 g / mL.

[0094] b) Graphene oxide was prepared according to the improved Hummers method. Disperse 200mg graphene oxide in 50mLNMP to form a dispersion containing graphene oxide sheets;

[0095] c) Take 11 mL of the precursor dispersion obtained in step a) and slowly add it dropwise to the dispersion containing graphene oxide sh...

Embodiment 2

[0100] The characterization of embodiment 2 sample

[0101] 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 1 shown, sample 2 # ~Sample 5 # The XRD spectrum and figure 1 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 1 It can be seen that each diffraction peak in the experimental spectrum of the obtained product is related to In 2 Se 3 The phase standard spectrum (PDF#40-1407) corresponds very well, and there is an obvious reduced graphene oxide peak at a diffraction angle of about 27°. Accordingly, it can be proved that the obtained product is In 2 Se 3 Composites with reduced graphene oxide.

[0102] Using Vario EL III instrument test / calculation, get sample 1 # The weight percent content of the medium an...

Embodiment 3

[0105] Embodiment 3 is tested to lithium ion cyclic voltammetry

[0106] Take sample 1 # As a typical representative, its cyclic voltammetry curve is tested, as follows:

[0107] The heat-treated composite material, the conductive agent conductive carbon black, and the binder polyvinylidene fluoride (PVDF) are formulated into a slurry at a weight ratio of 8:1:1, and evenly coated on the surface of the copper foil of the negative electrode current collector, followed by After drying under vacuum at 120°C, operations such as pressing, slicing, and weighing were carried out to obtain the negative electrode sheet. Mix ethylene carbonate (abbreviated as EC), diethyl carbonate (abbreviated as DMC) and diethyl carbonate (abbreviated as DEC) according to the volume ratio of EC:DMC:DEC=1:1:1 and then add LiPF 6 , to get LiPF 6 A solution with a concentration of 1 mol / L is finally added with 5% fluoroethylene carbonate (the volume fraction of fluoroethylene carbonate in the electroly...

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Abstract

The invention discloses an indium selenide / nitrogen-doped reduced graphene oxide composite material as well as a preparation method and application thereof. The composite material comprises reduced graphene oxide, wherein indium selenide nanodots are loaded on the surface of the reduced graphene oxide; and the composite material is doped with a nitrogen element. According to the invention, selenoindium acid radical-containing nanoparticle ionic liquid is used as a precursor to serve as a morphology regulating agent, an interface assembly medium, a metal source, a carbon / nitrogen source and other multiple roles, and meanwhile, indium selenide nanoparticles and heteroatom-doped reduced graphene oxide are induced to be effectively compounded. In the obtained indium selenide / nitrogen-doped reduced graphene oxide composite material, nano indium selenide uniformly grows on a reduced graphene oxide sheet layer, and the average particle size is 3-10nm. The bonding strength between the nano indium selenide and the reduced graphene oxide is high, and the nano particles have the characteristics of uniform morphology, small size and the like. The composite material is used as a battery negative electrode material, and shows good electrochemical lithium storage activity.

Description

technical field [0001] The application relates to an indium selenide / nitrogen-doped reduced graphene oxide composite material and its preparation method and application, belonging to the field of energy storage. Background technique [0002] Lithium-ion batteries (LIBs) are currently one of the most promising energy storage devices due to their high energy density, high operating voltage, low self-discharge, long cycle life, and environmental protection. LIBs have been extensively studied to meet the growing demands of various energy applications ranging from traditional portable electronics to emerging fields such as electric vehicles and grid storage. However, commercial secondary lithium-ion batteries usually use graphite as the negative electrode material of lithium-ion batteries, and its low theoretical capacity (372mA h / g) can no longer meet people's needs, so electrodes with high energy density and high rate performance have been developed. Materials are particularly...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525C01B19/00C01B32/194B82Y30/00
CPCH01M4/366H01M4/581H01M4/625H01M10/0525C01B19/007C01B32/194B82Y30/00C01P2004/80C01P2002/72C01P2006/40H01M2004/021H01M2004/027Y02E60/10
Inventor 程敏李建荣黄小荥
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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