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Alpha-phase fusiform porous ferric oxide material and preparation method and application thereof

A ferric oxide and shuttle-shaped technology, which is applied in the field of α-phase shuttle-shaped porous ferric oxide material and its preparation, can solve the problems of poor cycle life and achieve improved cycle life, easy implementation, and good reproducibility Effect

Inactive Publication Date: 2017-12-29
JIANGSU UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide an α-phase shuttle-shaped porous ferric oxide material and its preparation method and application, so as to solve the technical problem of poor cycle life of the existing ferric oxide as lithium-ion battery negative electrode material

Method used

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  • Alpha-phase fusiform porous ferric oxide material and preparation method and application thereof
  • Alpha-phase fusiform porous ferric oxide material and preparation method and application thereof
  • Alpha-phase fusiform porous ferric oxide material and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0026] (1) 0.649g ferric chloride and 0.649g fumaric acid were added to a beaker filled with 16ml dimethylformamide and stirred continuously until all dissolved;

[0027] (2) Place the mixed dimethylformamide solution in step (1) in a 20 mL autoclave, then place it in an oven for solvothermal treatment, keep it at 80°C for 4 hours, and then cool it naturally to room temperature;

[0028] (3) Centrifuge the sample after solvoheating in step (2) at a speed of 5000 r / min and wash it with ethanol 4 times; finally put the precipitate in a vacuum drying machine for drying at 80°C to obtain an iron-based metal-organic framework Nanofibers;

[0029] (4) Place the iron-based metal-organic framework nanofibers dried in step (3) in a tube furnace, and feed air protection gas at an air intake rate of 0.15 L / min. The heating rate is 2 °C / min, and the temperature is raised to 500°C and heat preservation for 4 hours, then naturally cooled to room temperature to obtain the α-phase shuttle-sh...

Embodiment 2

[0033] (1) 0.779 g of ferric nitrate and 0.389 g of fumaric acid were added to a beaker filled with 16 ml of dimethylformamide and stirred continuously until all dissolved;

[0034] (2) Place the mixed dimethylformamide solution in step (1) in a 20 mL autoclave, then place it in an oven for solvothermal treatment, keep it at 80°C for 4 hours, and then cool it naturally to room temperature;

[0035] (3) Centrifuge the sample after solvothermal in step (2) at a speed of 6500 r / min and wash it with ethanol for 4 times; finally put the precipitate in a vacuum drying machine for drying at 80°C to obtain an iron-based metal-organic framework Nanofibers;

[0036](4) Place the iron-based metal-organic framework nanofibers dried in step (3) in a tube furnace, and feed air protection gas at an air intake rate of 0.3 L / min. The heating rate is 3°C / min, and the temperature is raised to 500°C and heat preservation for 4 hours, then naturally cool to room temperature to obtain α-phase poro...

Embodiment 3

[0039] (1) 0.724 g of ferric sulfate and 0.483 g of fumaric acid were added to a beaker filled with 16 ml of dimethylformamide and stirred continuously until all dissolved;

[0040] (2) Place the mixed dimethylformamide solution in step (1) in a 20 mL autoclave, then place it in an oven for solvothermal treatment, keep it at 80°C for 4 hours, and then cool it naturally to room temperature;

[0041] (3) Centrifuge the sample after solvothermal in step (2) at a speed of 8000 r / min and wash it with ethanol for 4 times; finally put the precipitate in a vacuum drying machine for drying at 80°C to obtain an iron-based metal-organic framework Nanofibers;

[0042] (4) Place the iron-based metal-organic framework nanofibers dried in step (3) in a tube furnace, and feed air protection gas at an air intake rate of 0.4 L / min. The heating rate is 5°C / min, and the temperature is raised to 500°C and heat preservation for 4 hours, then naturally cooled to room temperature to obtain the α-pha...

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Abstract

The invention relates to an alpha-phase fusiform porous ferric oxide material and a preparation method and application thereof. The alpha-phase fusiform porous ferric oxide material is prepared from a ferric salt, fumaric acid and dimethylformamide, wherein the ferric salt and the fumaric acid are mixed in dimethylformamide solution, the mass ratio of the ferric salt to the fumaric acid is (2-2.4):1, and the concentration of the ferric salt in the dimethylformamide is 40.58-48.70 g / L. Firstly, the ferric acid and the fumaric acid are mixed in the dimethylformamide, the mixture is added in a high pressure reactor to carry out solvent thermal treatment, centrifugal separation is performed, precipitate is washed with ethanol, and the dried precipitate is roasted to obtain the alpha-phase fusiform porous ferric oxide material. The alpha-phase fusiform porous ferric oxide material and the preparation method and application thereof have the advantages that a lithium-ion battery gains greatly increased capacity retention ratio, greatly improved rate performance and greatly extended cycle life by applying the alpha-phase fusiform porous ferric oxide material prepared herein to the lithium-ion battery, and the method is simple, good in reproducibility and easy to implement.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to an α-phase shuttle-shaped porous ferric oxide material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high capacity, small size, light weight, no memory effect, small self-discharge and long cycle life, making them a new chemical power source with great potential in the 21st century. At present, the theoretical capacity of the negative electrode material graphite in commercial lithium batteries is only 372 mAh / g, which cannot meet the application requirements of high-performance batteries. Therefore, the development of anode materials with higher capacity, long cycle life and high rate performance has become the goal pursued by researchers at home and abroad. Among them, the transition metal oxide ferric oxide (Fe 2 o 3 ) theoretical capaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06H01M4/525H01M10/0525
CPCC01G49/06C01P2002/72C01P2004/03H01M4/525H01M10/0525Y02E60/10
Inventor 汪洋杨宏训王震康
Owner JIANGSU UNIV OF SCI & TECH
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