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Nitrogen and phosphorus co-doped vanadium oxide/carbon self-supporting electrode material and preparation method and application thereof

A self-supporting electrode, vanadium oxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as difficulty in regulating the content of oxygen vacancies, and difficulty in substantially improving the electrochemical performance of electrodes.

Pending Publication Date: 2022-08-02
SOUTH CHINA NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although heteroatom-doped transition metal oxides can introduce oxygen vacancies and heteroatoms at the same time, it is difficult to control the content of oxygen vacancies during the doping process, making it difficult to substantially improve the electrochemical performance of heteroatom-doped transition metal oxide electrodes.

Method used

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  • Nitrogen and phosphorus co-doped vanadium oxide/carbon self-supporting electrode material and preparation method and application thereof
  • Nitrogen and phosphorus co-doped vanadium oxide/carbon self-supporting electrode material and preparation method and application thereof
  • Nitrogen and phosphorus co-doped vanadium oxide/carbon self-supporting electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of spinning solution: add 0.6g vanadium acetylacetonate and 0.4g polyacrylonitrile to the organic solution dissolved in 1g N,N-dimethylformamide, stir at 50°C under constant temperature magnetic force for 6h, and the stirring speed is 500r / min, to prepare a homogeneous solution. Subsequently, keeping the temperature and stirring speed unchanged, 0.2 g of melamine and 0.1 g of melamine phosphate were added to the above solution every 6 h to obtain a uniform spinning solution, and the order of addition of melamine and melamine phosphate was not limited.

[0032] Electrospinning: The above spinning solution is transferred into a needle tube for spinning to prepare a film. Among them, the working distance is 17cm, the humidity is 17%, the temperature is 32°C, the positive voltage is 16kV, the negative voltage is -0.05kV, the drum speed is 250r / min, and the spinning needle type is 19G.

[0033] Removal of organic solution: dry in a drying oven at 60°C for 6 h t...

Embodiment 2

[0043] Preparation of spinning solution: add 0.6g vanadium acetylacetonate and 0.4g polyacrylonitrile to the organic solution dissolved in 1g N,N-dimethylformamide, stir at 50°C under constant temperature magnetic force for 6h, and the stirring speed is 500r / min, to prepare a homogeneous solution. Subsequently, keeping the temperature and stirring speed unchanged, 0.2 g of melamine and 0.1 g of melamine phosphate were added to the above solution every 6 h to obtain a uniform spinning solution, and the order of addition of melamine and melamine phosphate was not limited.

[0044] Electrospinning: The above spinning solution is transferred into a needle tube for spinning to prepare a film. Among them, the working distance is 17cm, the humidity is 17%, the temperature is 32°C, the positive voltage is 16kV, the negative voltage is -0.05kV, the drum speed is 250r / min, and the spinning needle type is 19G.

[0045] Removal of organic solution: dry in a drying oven at 60°C for 6 h t...

Embodiment 3

[0049] Preparation of spinning solution: add 0.6g vanadium acetylacetonate and 0.4g polyacrylonitrile to the organic solution dissolved in 1g N,N-dimethylformamide, stir at 50°C under constant temperature magnetic force for 6h, and the stirring speed is 500r / min, to prepare a homogeneous solution. Subsequently, keeping the temperature and stirring speed unchanged, 0.2 g of melamine and 0.12 g of melamine phosphate were added to the above solution every 6 hours to obtain a uniform spinning solution, and the order of addition of melamine and melamine phosphate was not limited.

[0050] Electrospinning: The above spinning solution is transferred into a needle tube for spinning to prepare a film. Among them, the working distance is 17cm, the humidity is 17%, the temperature is 32°C, the positive voltage is 16kV, the negative voltage is -0.05kV, the drum speed is 250r / min, and the spinning needle type is 19G.

[0051] Removal of organic solution: dry in a drying oven at 60°C for ...

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Abstract

The invention relates to a nitrogen and phosphorus co-doped vanadium oxide / carbon self-supporting electrode material and a preparation method and application thereof.The method comprises the steps that at a certain temperature, a vanadium source compound and a carbon source compound are dissolved into an organic solution to obtain a uniform solution, the temperature is kept, then a nitrogen source compound and a phosphorus source compound are added into the solution at certain intervals, and the nitrogen and phosphorus co-doped vanadium oxide / carbon self-supporting electrode material is obtained. A uniform spinning solution is obtained; carrying out electrostatic spinning to obtain a nanofiber film, and then drying to remove the organic solution to obtain a self-supporting electrode precursor; and pre-oxidizing the self-supporting electrode precursor, and then calcining at high temperature for a certain time to obtain the nitrogen and phosphorus co-doped VO / C self-supporting electrode material with a proper amount of oxygen vacancies. The electrode material has a relatively high specific surface area and a proper amount of oxygen vacancy defects and nitrogen and phosphorus heteroatoms, and shows long service life, high specific capacity and excellent cycling stability and rate capability.

Description

technical field [0001] The invention relates to the application field of zinc ion batteries, in particular to a nitrogen and phosphorus co-doped vanadium oxide / carbon self-supporting electrode material and a preparation method and application thereof. Background technique [0002] Rechargeable battery energy storage technology with high energy density, low cost, and intrinsic safety has always been an urgent need in the fields of electric vehicles, smart grids, and micro-nano devices. Given the high theoretical capacity of zinc metal (820mAh g -1 ), low cost and low redox potential (-0.762V vs. SHE), and the high chemical stability of aqueous electrolytes, aqueous Zn-ion batteries have been recognized as the next-generation energy storage technology with great market competitiveness in recent years. Cathode materials often play a crucial role in determining battery energy and power density. Therefore, the development of cathode materials has become an important support poi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62
CPCH01M4/625H01M4/364H01M4/48H01M4/38Y02E60/10
Inventor 赵灵智侯爽
Owner SOUTH CHINA NORMAL UNIVERSITY
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