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A kind of ferric oxide nanotube material and its preparation method and application

A ferric oxide and nanotube technology, applied in nanotechnology, nanotechnology, secondary battery manufacturing, etc., can solve the problems of low coulombic efficiency and poor cycle life, and achieve improved coulombic efficiency, good reproducibility, suitable for The effect of mass production

Active Publication Date: 2018-09-04
镇江润波电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems of low coulombic efficiency and poor cycle life of the existing ferric oxide as the negative electrode material of lithium-ion batteries, and to provide a ferric oxide nanotube material and its preparation method and application

Method used

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  • A kind of ferric oxide nanotube material and its preparation method and application
  • A kind of ferric oxide nanotube material and its preparation method and application
  • A kind of ferric oxide nanotube material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) 0.822g ferric chloride and 1.234g fumaric acid are joined in the beaker that fills 80ml deionized water, constantly stir with the rotating speed of 800r / min, until fully dissolving;

[0029] (2) Place the mixed aqueous solution in step (1) in a 100mL autoclave, then place it in an oven for hydrothermal treatment, keep it at 70°C for 24 hours, and then cool it naturally to room temperature;

[0030] (3) Centrifuge the hydrothermal sample in step (2) at a speed of 6000r / min and wash it three times with ethanol and deionized water; finally, put the precipitate in a vacuum drying chamber for drying at 80°C to obtain iron based metal-organic framework nanofibers.

[0031] (4) Place the iron-based metal-organic framework nanofibers dried in step (3) in a tube furnace, feed air protection gas with an air intake of 0.15 L / min, and heat up at a rate of 2° C. / min. 550° C. and heat preservation for 4 hours, then naturally cool to room temperature to obtain ferric oxide nanotu...

Embodiment 2

[0034] (1) 1.112g of ferric nitrate and 1.112g of fumaric acid are added to a beaker filled with 80ml of deionized water, and continuously stirred at a speed of 700r / min until completely dissolved;

[0035] (2) Place the mixed aqueous solution in step (1) in a 100mL autoclave, then place it in an oven for hydrothermal treatment, keep it at 80°C for 24 hours, and then cool it naturally to room temperature;

[0036] Other steps are identical with embodiment 1.

Embodiment 3

[0038] (1) 0.741g ferric sulfate and 1.334g fumaric acid are added in the beaker that fills 80ml deionized water, constantly stir with the rotating speed of 900r / min, until fully dissolving;

[0039] (2) Place the mixed aqueous solution in step (1) in a 100mL autoclave, then place it in an oven for hydrothermal treatment, keep it at 75°C for 24 hours, and then cool it naturally to room temperature;

[0040] Other steps are identical with embodiment 1.

[0041] Table 1 shows the capacities obtained in the first cycle and the 50th cycle of the charge-discharge test of the lithium-ion batteries of Examples 1-3 at a current of 0.1C.

[0042] Table 1

[0043]

[0044] It can be seen from Table 1 that the ferric oxide nanotubes prepared by this method are used as electrode materials and applied to lithium-ion batteries. After 50 cycles, the capacity retention rate is above 88.4%, which has good cycle performance and is still high. In the current commercial graphite anode materi...

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Abstract

A ferric oxide nanotube negative electrode material is prepared from iron salt, fumaric acid and deionized water; the steps are: first adding ferric salt and fumaric acid to deionized water, Stir at a speed of 600-1000r / min for 2-6 hours; then transfer the mixed aqueous solution to an autoclave at 70°C-90°C for 12-24 hours; after naturally cooling to room temperature, cool the low temperature at a speed of 4000-7000r / min The hydrothermally generated precipitate was centrifuged and washed three times with ethanol and deionized water; then the precipitate was vacuum-dried at 80-100°C to obtain iron-based metal-organic framework nanofibers; finally, the iron-based metal-organic framework nanofibers were Put it in a tube furnace, feed air protection gas at an air intake rate of 0.2-0.8L / min, raise the temperature at a rate of 0.5-2°C / min to 550°C-600°C and keep it warm for 2-6 hours, then cool naturally to At room temperature, the ferric oxide nanotube material is obtained. The ferric oxide nanotube material prepared by the invention is applied to the lithium ion battery, improves the first coulombic efficiency and cycle life of the lithium battery, has simple process, good reproducibility and is 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 a ferric oxide nanotube material for lithium ion batteries 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 372mAh / 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 ) The theoretical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/52B82Y30/00H01M4/1391H01M10/04H01M10/0525
CPCB82Y30/00H01M4/1391H01M4/52H01M10/0427H01M10/0525Y02E60/10Y02P70/50
Inventor 孙明琛杨宏训孙孟飞宋旺华孙胜男聂宇
Owner 镇江润波电子科技有限公司
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