Nitrogen-doped porous hollow carbon sphere and preparation method and application thereof

A hollow carbon sphere, nitrogen doping technology, applied in active material electrodes, electrical components, electrochemical generators, etc., to achieve the effects of controllable morphology, reduced production costs, and promotion of electron and electrolyte transport

Pending Publication Date: 2020-01-24
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] From the previous preparation techniques of porous carbon materials, it can be found that only using traditional hard template synthesis strategies to optimize the performance of carbon materials has great limitations, so it is necessary to develop novel synthesis routes to enrich the preparation methods, but this preparation method requires Taking into account the simple synthesis process and cheap material sources, only in this way can large-scale industrial production be facilitated

Method used

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  • Nitrogen-doped porous hollow carbon sphere and preparation method and application thereof
  • Nitrogen-doped porous hollow carbon sphere and preparation method and application thereof
  • Nitrogen-doped porous hollow carbon sphere and preparation method and application thereof

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Effect test

Embodiment 1

[0038] The preparation method of the nitrogen-doped porous hollow carbon sphere provided by the invention, the specific process is as follows figure 1 Shown:

[0039] a) 2.0g melamine and 6.0g formaldehyde solution (mass fraction is 35%) are added to 200mL deionized water, stirred in 60 ℃ water bath to obtain a clear solution, then add 0.4g hydrochloric acid (mass fraction is 37%), then in Stir in a water bath at 60° C. for 4 hours, separate by filtration, and collect samples to obtain monodisperse melamine resin beads (MFspheres) with an average diameter of about 1500 nm.

[0040] b) Take 1.0 g of monodisperse melamine resin beads as a template, disperse them in 100 mL of deionized water, then add 0.2 g of pyrrole and 0.3 g of ammonium persulfate in sequence, then continue stirring for 24 hours, centrifuge, collect samples, and dry , to obtain melamine resin beads (MF spheres@Ppy) coated with polypyrrole.

[0041] c) Put the melamine resin pellets coated with polypyrrole in...

Embodiment 2

[0049] A preparation method of nitrogen-doped porous hollow carbon spheres: comprising the steps of:

[0050] a) 1.0g melamine and 5.0g formaldehyde solution (35% by mass fraction) were added to 100mL deionized water, stirred in a water bath at 40°C to obtain a clear solution, then 0.8g hydrochloric acid (37% by mass fraction) was added, and then Stir in a water bath at 40°C for 10 h, filter and separate, and collect samples to obtain monodisperse melamine resin pellets (MF spheres).

[0051] b) Take 0.5 g of monodisperse melamine resin beads as templates, disperse them in 50 mL of deionized water, then add 0.1 g of pyrrole and 0.2 g of ammonium persulfate in sequence, then continue to stir for 10 h, centrifuge, and collect samples. After drying, melamine resin pellets (MFspheres@Ppy) coated with polypyrrole were obtained.

[0052] c) Put the melamine resin pellets coated with polypyrrole in a tube furnace, use nitrogen as an inert protective gas, and heat at 1°C min -1 The ...

Embodiment 3

[0056] A preparation method of nitrogen-doped porous hollow carbon spheres: comprising the steps of:

[0057] a) 3.0g melamine and 15g formaldehyde solution (35% by mass fraction) were added to 300mL deionized water, stirred in a water bath at 50°C to obtain a clear solution, then 2.0g hydrochloric acid (37% by mass fraction) was added, and then Stir in a water bath at ℃ for 3 hours, filter and separate, collect samples, and obtain monodisperse melamine resin pellets (MF spheres).

[0058] b) Take 3 g of monodisperse melamine resin beads as templates, disperse them in 150 mL of deionized water, then add 6.0 g of pyrrole and 9.0 g of ammonium persulfate in sequence, then continue to stir for 30 h, centrifuge, collect samples, and dry , to obtain melamine resin beads (MF spheres@Ppy) coated with polypyrrole.

[0059] c) Put the melamine resin pellets coated with polypyrrole in a tube furnace, use nitrogen as an inert protective gas, and heat at 5°C min -1 The heating rate was ...

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Abstract

Melamine resin pellets are obtained through one-step condensation of melamine and formaldehyde, the melamine resin pellets used as templates are coated with polypyrrole by using pyrrole as a nitrogensource and a carbon source and ammonium persulfate as a catalyst; the melamine resin pellets are gradually decomposed in the roasting process by controlling roasting to obtain nitrogen-doped porous hollow carbon spheres; and finally, the material is used in a lithium ion battery negative electrode. By using the melamine resin pellets instead of traditional silicon dioxide pellets, the problem of environmental pollution caused by etching of a silicon dioxide hard template with use of toxic reagents such as hydrofluoric acid in a traditional hard template method is avoided. Because the melamineresin pellets can generate a large amount of gas in the decomposition process, pores can be further formed in the pore walls of the hollow carbon spheres. Because the material is uniform in morphology, large in specific surface area and of a hollow structure, volume expansion can be relieved, and high specific capacity and cycle stability are shown in the lithium ion battery.

Description

technical field [0001] The invention relates to a method for preparing a nitrogen-doped porous hollow carbon sphere catalytic material, which is used in the field of negative electrode materials for lithium ion batteries, and belongs to the field of inorganic nano-catalytic materials. Background technique [0002] With the rapid development of society, people's demand for mobile rechargeable power sources is increasing. Lithium-ion batteries (LIBs) have been rapidly developed due to their high capacity and high energy. Due to its low price, low operating voltage, high conductivity, good cycle life, and small volume change during lithium intercalation / extraction, graphite has gradually become the most widely used anode material for lithium-ion batteries. [0003] During the lithium intercalation process of graphite, one lithium atom and six carbons are combined to form LiC6, and the corresponding theoretical reversible capacity is 372mAh g -1 . In addition, the migration r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/62H01M10/0525
CPCH01M4/624H01M4/628H01M4/587H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 杨丹丹
Owner NANKAI UNIV
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