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Flexible metal oxide/N-doped graphene composite paper and preparation method and application thereof

A nitrogen-doped graphene and oxide technology, which is applied in the field of nanomaterial flexible devices, can solve the problems of easy falling off electrochemical performance and high resistance, and achieve the effects of reducing electron transfer resistance, low hydrothermal temperature and low pressure

Active Publication Date: 2018-10-23
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, metal oxide / nitrogen-doped graphene is used as the powder material, a small amount of graphene oxide is introduced as a binder, and the metal oxide is in-situ grown and evenly loaded on the nitrogen-doped graphene through a hydrothermal process, and then the metal oxide is loaded on the nitrogen-doped graphene through two The powder material is prepared into composite paper by combining hydrothermal, suction filtration, and low-temperature drying methods, which solves the problem of poor electrochemical performance caused by the high resistance of the powder material used as a lithium battery pole piece and easy to fall off during charging and discharging.

Method used

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  • Flexible metal oxide/N-doped graphene composite paper and preparation method and application thereof
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  • Flexible metal oxide/N-doped graphene composite paper and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0039] 1. Preparation

[0040] S1. Prepare 400ml of graphene oxide aqueous solution with a concentration of 0.5mg / ml. Under magnetic stirring conditions, add 16ml of 50wt% cyanamide aqueous solution dropwise. After the dispersion is uniform, put it in a water bath at 90°C for 24h. After the reaction is completed, filter and freeze-dry , grinding to obtain nitrogen-doped graphene;

[0041] S2. Measure 180ml of absolute ethanol, weigh 30mg of nitrogen-doped graphene, and after ultrasonic dispersion is uniform, add 2.25ml of TiCl with a concentration of 0.8mol / l dropwise under stirring conditions 4 / absolute ethanol solution, then dropwise add 4ml deionized water, stir for 90min, obtain uniformly dispersed nitrogen-doped graphene and TiCl 4 the dispersion liquid;

[0042] S3. Transfer the dispersion to a 200ml hydrothermal kettle, react at 120°C for 2 hours, cool to room temperature after the reaction, and then filter, dry, and grind to obtain powdered TiO 2 / Nitrogen-doped g...

Embodiment 2

[0048] 1. Preparation

[0049] S1. Prepare 200 mg of graphene oxide aqueous solution, add 5 g of urea aqueous solution dropwise under the condition of magnetic stirring, and after the dispersion is uniform, bathe in 80°C water bath for 30 hours. After the reaction is completed, filter, freeze-dry, and grind to obtain nitrogen-doped graphene;

[0050] S2. Measure 180ml of absolute ethanol, weigh 30mg of nitrogen-doped graphene, and after ultrasonic dispersion is uniform, add 6ml of FeCl with a concentration of 0.5mol / l dropwise under stirring conditions 3 / methanol solution, then dropwise add 8ml deionized water, stir for 100min, obtain uniformly dispersed nitrogen-doped graphene and FeCl 3 the dispersion liquid;

[0051] S3. Transfer the dispersion to a 200ml hydrothermal kettle, react at 130°C for 1.5h, cool to room temperature after the reaction, and then filter, dry, and grind to obtain powdered Fe 2 o 3 / Nitrogen-doped graphene composite materials;

[0052] S4. Measure...

Embodiment 3

[0057] 1. Preparation

[0058] S1. Prepare 200mg of graphene oxide aqueous solution, add 16ml of melamine aqueous solution dropwise under the condition of magnetic stirring, after the dispersion is uniform, put it in a water bath at 140°C for 1 hour, after the reaction is completed, filter, freeze-dry, and grind to obtain nitrogen-doped graphene;

[0059] S2. Measure 180ml of absolute ethanol, weigh 30mg of nitrogen-doped graphene, and ultrasonically disperse evenly. Under stirring conditions, add 1ml of Sn(NO 3 ) 4 / dehydrated ethanol solution, then drop 2ml deionized water, stir for 120min, obtain uniformly dispersed nitrogen-doped graphene and Sn(NO 3 ) 4 the dispersion liquid;

[0060] S3. Transfer the dispersion to a 200ml hydrothermal kettle, react at 110°C for 12h, cool to room temperature after the reaction, and then filter, dry, and grind to obtain powdered SnO 2 / Nitrogen-doped graphene composite materials;

[0061] S4. Measure 1.5ml of graphene oxide with a con...

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Abstract

The invention discloses flexible metal oxide / N-doped graphene composite paper and a preparation method and application thereof. The composite paper is made through the following method which comprisesthe steps: mixing oxidized graphene and the water solution of a nitrogen-rich reagent, enabling the mixture to be uniformly dispersed, obtaining N-doped graphene through the water bath reaction, adding the mixture to an organic solvent A containing metal salt, and carrying out the hydrothermal reaction I after uniform dispersing; forming a powder metal oxide / N-doped graphene composite material through suction filtration, drying and grinding; enabling the powder metal oxide / N-doped graphene composite material and a little oxidized graphene to be uniformly dispersed through an organic solvent B, carrying out the secondary hydrothermal reaction II, forming a film through vacuum filtration, performing a drying operation, and finally performing a cleaning operation through an organic solvent C. According to the invention, the metal oxide is uniformly placed on the N-doped graphene, and the obtained composite paper is flexible and bendable, and can directly serve as an electrode, thereby achieving the excellent electrochemical performances of a lithium ion battery: high circulating stability, high magnification performance and high coulombic efficiency.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial flexible devices, and more specifically relates to a flexible metal oxide / nitrogen-doped graphene composite paper and its preparation method and application. Background technique [0002] Graphene has an ultra-high specific surface area and has been widely used in the field of lithium-ion batteries. The surface of graphene oxide is rich in oxygen-containing functional groups such as hydroxyl, epoxy, and carboxyl groups. These oxygen-containing functional groups are used to dope the surface of graphene oxide Modifications, such as boron doping, phosphorus doping, nitrogen doping, etc., can not only make doped graphene have an ultra-high specific surface area, but also obtain unexpected effects. According to reports, doped graphene has made great progress in the field of electrochemistry. Graphene provides a highly efficient conductive network and has higher stability for the loaded substances,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/36H01G11/46H01M4/36H01M4/485H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01G11/36H01G11/46H01M4/366H01M4/485H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 李运勇黄莹欧长志庾见林
Owner GUANGDONG UNIV OF TECH
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