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A self-supporting high-density metal oxide/nitrogen-doped graphene composite electrode and its preparation method and application

A nitrogen-doped graphene, composite electrode technology, applied in active material electrodes, negative electrodes, battery electrodes, etc., can solve the problems of easy falling off of pole pieces, poor cycle performance, easy crushing, etc., to solve the problem of easy falling off and maintain stability the effect of increasing the contact area

Active Publication Date: 2021-04-06
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Another object of the present invention is to provide a method for preparing the above-mentioned self-supporting high-density metal oxide / nitrogen-doped graphene composite electrode, which uses a low-temperature hydrothermal method to make the metal oxide in-situ grow uniformly loaded on nitrogen-doped graphite On the olefin, with an average size of 2-6nm, the powder material is prepared into a hydrogel by a combination of secondary hydrothermal, slicing, and natural shrinkage drying, without adding a binder, and can be directly used as a lithium battery or a sodium battery The electrode pole piece solves the problems that the powder material used as the pole piece is easy to fall off, easy to be crushed, large resistance during charge and discharge, and poor cycle performance.

Method used

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  • A self-supporting high-density metal oxide/nitrogen-doped graphene composite electrode and its preparation method and application
  • A self-supporting high-density metal oxide/nitrogen-doped graphene composite electrode and its preparation method and application
  • A self-supporting high-density metal oxide/nitrogen-doped graphene composite electrode and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0034] 1. Preparation

[0035] S1. Under the condition of magnetic stirring, add 0.5mg ml to 200ml -1 Add 8ml of cyanamide aqueous solution dropwise to the graphene oxide aqueous solution. After the dispersion is uniform, transfer it to a 250ml three-neck flask, react in a water bath at 90°C for 24 hours, and continue mechanical stirring, then vacuum filter and dry to obtain nitrogen-doped graphene. ;

[0036] S2. Weigh 30mg of nitrogen-doped graphene and stir or ultrasonically disperse evenly in 185ml of absolute ethanol, then add 3.3ml of 0.55mol l -1 Dissolved TiCl 4 Add 4ml of deionized water dropwise, stir for a period of time, and then conduct a hydrothermal reaction in a 200ml hydrothermal kettle at 120°C for 2 hours, then filter, dry, and wash to obtain TiO 2 / Nitrogen-doped graphene powder material;

[0037] S3. 28ml 4.5mg ml -1 Graphene oxide is dispersed in 25ml of aqueous solution, weigh 714mg of the product in S2 and disperse in 20ml of absolute ethanol solut...

Embodiment 2

[0042] 1. Preparation

[0043] S1. Under the condition of magnetic stirring, add 8ml of triethylamine aqueous solution dropwise to 100mg of graphene oxide aqueous solution. After the dispersion is uniform, transfer it to a 250ml three-necked flask, react in a water bath at 110°C for 6h, and continue to stir mechanically, and then filter through vacuum , dry to obtain nitrogen-doped graphene;

[0044] S2. Weigh 30mg of nitrogen-doped graphene and stir or ultrasonically disperse evenly in 185ml of acetone, then add 4ml of 0.6mol l -1 Dissolved Fe(NO 3 ) 3 Add 4ml of deionized water dropwise, and after stirring for a period of time, react in a 200ml hydrothermal kettle at 130°C for 4 hours, then filter, dry and wash to obtain Fe 2 o 3 / Nitrogen-doped graphene powder material;

[0045] S3. Mix 30ml with 4.2mg ml -1 Graphene oxide is dispersed in 25ml of aqueous solution, weigh 504mg of the product in S2 and disperse it in 20ml of absolute ethanol solution, then add the latte...

Embodiment 3

[0050] 1. Preparation

[0051] S1. Under the condition of magnetic stirring, add 4 g of urea aqueous solution dropwise to 100 mg of graphene oxide aqueous solution. After the dispersion is uniform, transfer it to a 250ml three-necked flask, react in a water bath at 95°C for 28 hours, and continue to stir mechanically, then vacuum filter and dry , to obtain nitrogen-doped graphene;

[0052] S2. Weigh 30mg of nitrogen-doped graphene and stir or ultrasonically disperse evenly in 185ml of isopropanol, then add dropwise 2.6ml of 0.75mol l -1 Dissolved with Sn(SO 4 ) 2 Then add 4ml of deionized water dropwise, stir for a period of time, and then conduct a hydrothermal reaction at 110°C in a 200ml hydrothermal kettle for 5h, then filter, dry, and wash to obtain SnO 2 / Nitrogen-doped graphene powder material;

[0053] S3. Mix 20ml with 4.5mg ml -1 Graphene oxide is dispersed in 25ml of aqueous solution, weigh 390mg of the product in S2 and disperse in 20ml of absolute ethanol sol...

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Abstract

The invention discloses a self-supporting high-density metal oxide / nitrogen-doped graphene composite electrode and a preparation method and application thereof. The composite electrode first obtains nitrogen-doped graphene through a water bath reaction, then disperses the nitrogen-doped graphene in an organic solvent, drips the organic solvent dissolved with the metal salt, and conducts a hydrothermal reaction after uniform dispersion to obtain a powdery metal oxide / nitrogen-doped graphene composite material; add a small amount of graphene oxide to make the metal oxide / nitrogen-doped graphene composite material evenly dispersed in graphene oxide, and obtain metal oxide / nitrogen-doped graphene composite material through secondary hydrothermal reaction Nitrogen-doped graphene hydrogels are finally prepared by slicing, shrinking and drying. The composite material of the present invention has a self-supporting structure with a density greater than 1.0 g / cm 3 , the electrode sheet obtained by the two-step hydrothermal method can be directly used as the electrode of lithium-ion battery or sodium-ion battery, realizing its electrochemical performance of high volume capacity, high reversibility and high rate performance.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial self-supporting devices, and more specifically relates to a self-supporting high-density metal oxide / nitrogen-doped graphene composite electrode and its preparation method and application. Background technique [0002] At present, the field of new energy is facing many problems to be solved urgently. Among them, lithium-ion batteries have high energy density and low power density, while supercapacitors have high power density and low energy density. How to combine the advantages of lithium-ion batteries and supercapacitors has become a research scholar. hotspots of our research. Many carbon nanoelectrode materials have high porosity but low density, resulting in a large amount of space inside the material being filled with electrolyte, which only increases the weight of the device without contributing to the capacity, thereby reducing the performance of the entire device. The low density mea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/52H01M4/587H01M4/62H01M10/0525H01M10/054B82Y30/00
CPCB82Y30/00H01M4/366H01M4/48H01M4/52H01M4/587H01M4/621H01M4/625H01M4/628H01M10/0525H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 李运勇黄莹朱俊陆严亮袁星星
Owner GUANGDONG UNIV OF TECH
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