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A kind of nitrogen-doped graphene film and its preparation method and application

A nitrogen-doped graphene and device preparation technology, applied in structural parts, electrical components, battery electrodes, etc., to avoid the use of additives and conductive agents, good scalability, uniformity and easy control.

Active Publication Date: 2021-03-09
HANGZHOU GAOXI TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, it is still difficult for the industry to obtain efficiently and quickly large-scale ordered assembled nitrogen-doped graphene films.

Method used

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  • A kind of nitrogen-doped graphene film and its preparation method and application
  • A kind of nitrogen-doped graphene film and its preparation method and application
  • A kind of nitrogen-doped graphene film and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Take 10mg g -1 Graphene oxide dispersion and pyrrole monomer were blended at 5:1. Inject it through a rectangular nozzle into a coagulation bath containing 0.1% ammonium persulfate at a rate of 0.1 cm s -1 The role of the flow field drafting to obtain a continuous wet-spun hydrogel membrane, in which pyrrole monomer polymerization to obtain polypyrrole. The hydrogel film was collected using a winder.

[0029] (2) Transfer the obtained graphene oxide-polypyrrole film into an aqueous solution containing hydrazine hydrate, keep it at 80 degrees Celsius for 2 hours, and reduce the graphene oxide to graphene.

[0030] (3) After the obtained black hydrogel film is taken out, it is repeatedly washed with deionized water to neutrality, dried and placed in a tube furnace, and calcined for 8 hours under the protection of nitrogen, and the calcination temperature is controlled at 600 degrees Celsius to obtain nitrogen-doped graphene membrane.

[0031] Under this example, t...

Embodiment 2

[0033] (1) Take 20mg g -1 Graphene oxide dispersion and pyrrole monomer were blended at a ratio of 1:5. It is injected into the coagulation bath containing ammonium persulfate with a mass fraction of 10% through a rectangular nozzle, at a rate of 2 cm s -1 The role of the flow field drafting to obtain a continuous wet-spun hydrogel membrane, in which pyrrole monomer polymerization to obtain polypyrrole. The hydrogel film was collected using a winder.

[0034] (2) Transfer the obtained graphene oxide-polypyrrole film into an aqueous solution containing hydrazine hydrate, keep it at 95 degrees Celsius for 24 hours, and reduce the graphene oxide to graphene.

[0035] (3) After taking out the obtained black hydrogel film, wash it repeatedly with deionized water to neutrality, dry it, place it in a tube furnace, and calcine it under the protection of nitrogen for 24 hours, and control the calcination temperature at 1200 degrees Celsius to obtain nitrogen-doped graphene membrane....

Embodiment 3

[0038] (1) Take 18mg g -1 Graphene oxide dispersion and pyrrole monomer were blended at 1:2. Inject it through a rectangular nozzle into a coagulation bath containing 0.5% ammonium persulfate at a rate of 0.5 cm s -1The role of the flow field drafting to obtain a continuous wet-spun hydrogel membrane, in which pyrrole monomer polymerization to obtain polypyrrole. The hydrogel film was collected using a winder.

[0039] (2) Transfer the obtained graphene oxide-polypyrrole film into an aqueous solution containing hydrazine hydrate, keep it at 85 degrees Celsius for 4 hours, and reduce the graphene oxide to graphene.

[0040] (3) After the obtained black hydrogel film is taken out, it is repeatedly washed with deionized water to neutrality, dried and placed in a tube furnace, and calcined for 12 hours under the protection of nitrogen, and the calcination temperature is controlled at 750 degrees Celsius to obtain nitrogen-doped graphene membrane.

[0041] Under this example, t...

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Abstract

The invention discloses a nitrogen-doped graphene membrane and a preparation method and application thereof. The preparation method of the nitrogen-doped graphene membrane comprises the steps of wet spinning a mixed solution of oxidized graphene and pyrrole, and shifting to a coagulating bath including an oxidizing agent to perform pyrrole in-situ polymerization; a continuous hydrogel membrane canbe acquired by using the drawing function of a flow field; and the graphene membranes with different nitrogen contents can be acquired via prereduction and high-temperature reduction. The nitrogen content of the nitrogen-doped graphene membrane prepared by the method can be controlled via controlling calcinations temperature, so that the balance of high concentration doping and high electrical conductivity is achieved, the different sodium-ion battery performance is acquired, the initial specific capacity of a battery can be up to 397mAh g<-1>, the specific capacity of 210mAh g<-1> can stillbe acquired after 100 charge-discharge cycles, and the rate capability is also good. Furthermore, the nitrogen-doped graphene membrane has extremely good flexibility, can be directly used as a supportelectrode; the mass production of the nitrogen-doped graphene membrane can be easily achieved by using the mature wet spinning technology in the industry, and the achievement transformation is easy to implement.

Description

technical field [0001] The invention relates to a nitrogen-doped graphene film, a preparation method and application thereof. Background technique [0002] Na-ion battery is a new type of energy storage device, which has the advantages of low raw material price and high energy density. Its energy storage mechanism is similar to that of lithium-ion batteries, but compared with lithium-ion batteries, it has the advantages of richer sodium reserves and easier access to raw materials, so it has become one of the research focuses in the field of secondary batteries. However, like lithium-ion batteries, the anode materials of sodium-ion batteries are usually graphite-based materials, which have low capacity and usually require additional additives for processing. In addition, because the size of sodium ions is larger than that of lithium ions, the rate and reactivity of intercalated graphite are much lower than those of lithium ions. This leads to the poor performance of sodium ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/587H01M10/054
CPCY02E60/10
Inventor 高超黄铁骑
Owner HANGZHOU GAOXI TECH CO LTD