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Niobium pentoxide three-dimensional doped graphene composite material, and preparation method and application thereof

A technology of niobium pentoxide and composite material, applied in the field of niobium pentoxide three-dimensional doped graphene composite material and its preparation, can solve the problem of lack of selectivity, lack of matching degree, insufficient active sites of pure graphene, etc. problems, to achieve the effect of favorable electrical conductivity, broad application prospects, and cheap and easy availability of experimental drugs

Active Publication Date: 2019-07-05
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, experiments and theory have proved that pure graphene has insufficient active sites, is not selective, and does not have a good match for practical applications.

Method used

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  • Niobium pentoxide three-dimensional doped graphene composite material, and preparation method and application thereof
  • Niobium pentoxide three-dimensional doped graphene composite material, and preparation method and application thereof
  • Niobium pentoxide three-dimensional doped graphene composite material, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The first step, preparation of three-dimensional doped graphene precursor solution:

[0025] Disperse 0.1g of graphene oxide in 25ml of deionized water, ultrasonically shake for 4 hours, centrifuge to take the supernatant, so that the graphene oxide is evenly dispersed to obtain a graphene oxide dispersion, add 0.1g of melamine powder, and stir at 80°C until completely Dissolve to obtain liquid A; take another 0.15g of thiocyanuric acid and dissolve it in 25ml of ethanol to obtain liquid B; slowly add liquid B to liquid A, stir at 70°C for 10 minutes, stir well and set aside.

[0026] The second step, preparation of three-dimensional niobium pentoxide doped graphene composite material:

[0027] Pour the three-dimensional doped graphene precursor solution prepared in the first step into a beaker, stir evenly, add 0.1g of niobium chloride, stir evenly, and transfer it to a reaction kettle with a polytetrafluoroethylene substrate, the filling ratio is 45% , placed in a ho...

Embodiment 2

[0031] The first step, preparation of three-dimensional doped graphene precursor solution:

[0032] Disperse 0.15g of graphene oxide in 50ml of deionized water, ultrasonically oscillate for 4 hours, centrifuge to take the supernatant to disperse the graphene oxide evenly, add 0.25g of melamine powder, stir at 80°C until completely dissolved, and obtain liquid A; Dissolve 0.3g of thiocyanuric acid in 25ml of ethanol to obtain liquid B; slowly add liquid B to liquid A, stir at 80°C for 20min, stir well and set aside.

[0033] The second step, preparation of three-dimensional niobium pentoxide doped graphene composite material:

[0034] Pour the three-dimensional doped graphene precursor solution prepared in the first step into a beaker, stir evenly, add 0.2g of niobium chloride, stir evenly, and transfer it to a reaction kettle with a polytetrafluoroethylene substrate, the filling ratio is 65% , placed in a homogeneous reactor for hydrothermal reaction at 150°C / 12h; the hydroth...

Embodiment 3

[0039] The first step, preparation of three-dimensional doped graphene precursor solution:

[0040] Disperse 0.2g of graphene oxide in 50ml of deionized water, ultrasonically shake for 4 hours, centrifuge to take the supernatant to disperse the graphene oxide evenly, add 0.2g of melamine powder, stir at 80°C until completely dissolved, and obtain liquid A; Dissolve 0.35g of thiocyanuric acid in 25ml of ethanol to obtain liquid B; slowly add liquid B to liquid A, stir at 80°C for 30min, stir well and set aside.

[0041] The second step, preparation of three-dimensional niobium pentoxide doped graphene composite material:

[0042] Pour the three-dimensional doped graphene precursor solution prepared in the first step into a beaker, stir evenly, add 0.3g of niobium chloride, stir evenly, and transfer it to a reaction kettle with a polytetrafluoroethylene substrate, and the filling ratio is 75% , placed in a homogeneous reactor for hydrothermal reaction at 180°C / 12h; the hydrothe...

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Abstract

The invention discloses a niobium pentoxide three-dimensional doped graphene composite material, and a preparation method and application thereof. The uniform niobium pentoxide three-dimensional dopedgraphene composite material is prepared by adoption of a hydrothermal method and subsequent high-temperature calcination; graphene can be self-assembled into three-dimensional graphene in situ in hydrothermal reaction; the possibility for large specific surface area is provided; niobium pentoxide and the three-dimensional graphene are composite, so that the poor conductivity problem of niobium pentoxide is greatly improved; simultaneously, N and S are doped on the surface of the graphene, so that more active sites are provided; the particle diameter of niobium pentoxide is refined; the conductivity is easily improved; a synthetic method is simple; experimental drugs are cheap and easy to obtain; the cost is low; the prepared niobium pentoxide three-dimensional doped graphene composite material can be used in the fields of lithium ion batteries, lithium-sulphur batteries, super-capacitors, electro-catalysis and the like; and thus, the application prospect is wide.

Description

technical field [0001] The invention relates to the field of battery electrode materials, in particular to a three-dimensional niobium pentoxide doped graphene composite material and its preparation method and application. Background technique [0002] Nb 2 o 5 As an embedded pseudocapacitive material, the lithium intercalation and deintercalation process occurs in the bulk phase, without phase transition, and the response time is short. It is an electrode material that can realize fast charging and fast discharging. Nb 2 o 5 Because of its safe operation, high speed and stable cycle performance, it has been widely researched and applied. However, the electronic conductivity of niobium pentoxide is very poor. It is necessary to combine nanostructured niobium pentoxide with carbon materials, and use carbon materials to provide a good conductive network for electron transmission and improve its conductivity. Due to its high electronic conductivity, large specific surface ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525H01M10/052H01G11/30H01G11/36H01G11/46H01G11/24B01J23/648
CPCH01M4/362H01M4/485H01M4/625H01M10/0525H01M10/052H01G11/30H01G11/36H01G11/46H01G11/24B01J23/6484B01J35/33Y02E60/13Y02E60/10
Inventor 黄剑锋王羽偲嘉李嘉胤曹丽云仵婉晨席乔罗晓敏王海
Owner SHAANXI UNIV OF SCI & TECH
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