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Nanoparticle/porous graphene composite, synthesizing methods and applications of same

A technology of porous graphene and nanoparticles, applied in the field of nanometers, which can solve problems such as dispersion and reorganization of nanocarbons, and difficult mixing of compounds

Inactive Publication Date: 2018-09-28
HK GRAPHENE TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the formation of carbon nanotube-based and graphene-based LTO nanocomposites has emerged as an effective approach to improve battery performance, the strategy always suffers from the problem of dispersion and reorganization of nanocarbons, making the compound difficult to mix.
Therefore, it is still challenging to load active materials on nanocarbons and prepare high-performance electrode materials.

Method used

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  • Nanoparticle/porous graphene composite, synthesizing methods and applications of same
  • Nanoparticle/porous graphene composite, synthesizing methods and applications of same
  • Nanoparticle/porous graphene composite, synthesizing methods and applications of same

Examples

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example 1

[0054] This illustrative example provides a method for the synthesis of LTO / nitrogen doped mesoporous graphene fibers. The synthesis method according to one embodiment of the present invention is described in detail as follows.

[0055] (1) Disperse about 20 mg of nitrogen-doped mesoporous graphene fibers into about 10 mL of ethanol to form a homogeneous dispersion; then, add about 0.11 g of lithium acetate and about 0.72 g of tetra-n-butyl titanate to the precursor of LTO The bulk is dissolved in a dispersion of nitrogen-doped mesoporous graphene fibers, thereby forming a precursor mixture.

[0056] (2) Treat the precursor mixture to evaporate the ethanol.

[0057] (3) After processing, the collected dried powder was annealed at a temperature of about 800° C. under argon flow to form the final LTO / doped mesoporous graphene fiber composite.

[0058] image 3 The TEM image of the LTO / nitrogen-doped mesoporous graphene fiber nanocomposite shown in , demonstrates the uniform l...

example 2

[0060] This example provides a synthetic Fe 3 o 4 / Nitrogen-doped mesoporous graphene fibers. The synthesis method according to one embodiment of the present invention is described in detail as follows.

[0061] (1) Disperse about 0.5g of doped mesoporous graphene fibers in about 300mL of alcohol-water (1:2, v / v) solution, then add about 1.82g of FeCl 3 and about 1.11 FeCl 2 4H 2 O as F 3 o 4 Precursors of nanoparticles.

[0062] (2) After adding about 12mL of about 28wt% ammonia solution, Fe appeared in the porous fiber 3 o 4 Co-precipitation of , which produces Fe 3 o 4 / porous graphene fiber composite. After filtration, collect Fe 3 o 4 / porous graphene fiber composite.

[0063] (3) Fe collected 3 o 4 / Porous graphene fiber composites were then processed at about 300 °C under nitrogen flow to form the final Fe 3 o 4 / doped mesoporous graphene fiber composites.

[0064] Figure 4 The TEM image of the metal oxide / doped mesoporous graphene fiber nanocompo...

example 3

[0066] This example provides a method for the synthesis of Pt / nitrogen doped mesoporous graphene fibers. The synthesis method according to one embodiment of the present invention is described in detail as follows.

[0067](1) Disperse about 0.1g doped mesoporous graphene fibers in about 300mL ethylene glycol solution, then add about 0.1g H 2 PtCl 6 ·6H 2 O as a Pt catalyst precursor. Ethylene glycol acts as a solvent to disperse the graphene fibers and also acts as a reducing agent for the Pt nanoparticles.

[0068] (2) The mixture dispersion is then refluxed at about 130°C for about 6 hours. Thereafter, Pt nanoparticles were precipitated within nitrogen-doped mesoporous graphene fibers with high density.

[0069] (3) After filtration, the Pt / porous graphene fiber composite was collected and dried at about 160° C. under argon flow.

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Abstract

In one aspect, the invention relates to a method of synthesizing a nanoparticle / porous graphene composite, including dispersing porous graphene structures into a solvent to form a dispersion of the porous graphene structures therein, adding precursors of nanoparticles into the dispersion of the porous graphene structures in the solvent to form a precursor mixture, and treating the precursor mixture to form a nanoparticle / porous graphene composite. The composite is formed such that the nanoparticles are uniformly distributed in pores of the graphene structures. The composite is very useful as electrode materials in electrochemical devices, in which efficient ions and electron transports are required.

Description

technical field [0001] The present invention relates generally to the field of nanotechnology, and more specifically to a method of loading active nanoparticles into nitrogen-doped mesoporous graphene fibers, and composites resulting therefrom and applications thereof. The resulting composites possess excellent electrochemical properties and great potential in a wide range of applications, such as in Li-ion batteries and supercapacitors. Background technique [0002] Nanocarbon and its composite materials have a wide range of applications. It has been widely used in the field of electrochemical energy storage, such as lithium-ion batteries (LIBs). Today, lithium-ion batteries extend their application to electric vehicles, large-scale power grids and renewable energy storage systems. Developing LIBs with higher energy / power density and improved safety is extremely important for those applications. Graphite has been widely used as anode material in LIBs. However, the poor ...

Claims

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Application Information

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IPC IPC(8): C01B32/182C01G23/00C01G49/08H01G11/32H01M4/583
CPCC23C18/00H01M4/131H01M4/625C01B32/194C01G49/08H01G11/36C01P2004/04H01M4/362H01M4/485C01G23/005H01G11/50C01P2006/40Y02E60/10Y02E60/13
Inventor 徐建国
Owner HK GRAPHENE TECH CORP