Spherical co3v2o8 and its preparation method

A spherical and solution technology, which is applied in chemical instruments and methods, cobalt compounds, structural parts, etc., can solve the problems of unprepared spherical Co, etc., and achieve uniform product particle size distribution, stable circulation effect, and obvious effect

Active Publication Date: 2019-03-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are very few research reports on related aspects, but none of them have prepared spherical Co 3 V 2 o 8

Method used

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  • Spherical co3v2o8 and its preparation method
  • Spherical co3v2o8 and its preparation method
  • Spherical co3v2o8 and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A spherical Co 3 V 2 o 8 A preparation method comprising the steps of:

[0032] ① Add ammonium metavanadate to deionized water at 70°C, and keep stirring for 5 minutes, the solution turns into light yellow-green;

[0033] ②Add CO(NH 2 ) 2 , and continued to stir for about 5min until CO(NH 2 )2 Fully dissolved;

[0034] ③ CoCl 2 ·6H 2 O was added to the above solution, and continued to stir for 10 minutes until the solution turned into a transparent reddish brown, wherein the range of Co:V molar ratio was 1:3, CO(NH 2 ) 2 The concentration range of 0.036mol / L;

[0035] ④Transfer the solution prepared above into a hydrothermal reaction kettle, and react at a temperature of 160°C for a time range of 8 hours;

[0036] ⑤ Cool the reaction sample prepared above to room temperature, wash it several times with deionized water and absolute ethanol, dry it at 60°C for 4 hours, put it into a tube furnace, calcinate it to 250°C, keep it for more than 2 hours, and finally...

Embodiment 2

[0039] A spherical Co 3 V 2 o 8 A preparation method comprising the steps of:

[0040] ①Add ammonium metavanadate to deionized water at 80°C, and keep stirring for 10 minutes, the solution turns into light yellow-green;

[0041] ②Add CO(NH 2 ) 2 , and continued stirring for about 10min until CO(NH 2 ) 2 Fully dissolved;

[0042] ③Co(NO 3 ) 2 ·6H 2 O was added to the above solution, and continued to stir for 15 minutes until the solution turned into a transparent reddish brown, wherein the range of Co:V molar ratio was 1:5.5, CO(NH 2 ) 2 The concentration range of 0.078mol / L;

[0043] ④Transfer the solution prepared above into a hydrothermal reaction kettle, and react at a temperature of 220°C, and the time range is 24h;

[0044] ⑤ Cool the reaction sample prepared above to room temperature, wash it several times with deionized water and absolute ethanol, dry it at 90°C for 6 hours, then put it into a tube furnace, calcinate it to 350°C, keep it for more than 2 hou...

Embodiment 3

[0047] A spherical Co 3 V 2 o 8 A preparation method comprising the steps of:

[0048] ① Add ammonium metavanadate to deionized water at 75°C, and keep stirring for 7 minutes, the solution turns light yellow-green;

[0049] ②Add CO(NH 2 ) 2 , and continued stirring for about 7min until CO(NH 2 ) 2 Fully dissolved;

[0050] ③Co(Ac) 2 4H 2 O was added to the above solution, and continued to stir for 12 minutes until the solution became transparent reddish brown, wherein the range of Co:V molar ratio was 1:4, CO(NH 2 ) 2 The concentration range of 0.055mol / L;

[0051] ④Transfer the solution prepared above into a hydrothermal reaction kettle, and react at a temperature of 180°C, and the time range is 12h;

[0052] ⑤ Cool the reaction sample prepared above to room temperature, wash it several times with deionized water and absolute ethanol, dry it at 80°C for 6 hours, put it into a tube furnace, calcinate it to 350°C, keep it for 4 hours, and finally get Spherical Co ...

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Abstract

The invention provides a spherical Co 3 V 2 o 8 and a preparation method thereof, comprising the steps of: adding ammonium metavanadate to deionized water for continuous stirring, and adding CO(NH 2 ) 2 , and kept stirring until CO(NH 2 ) 2 Fully dissolved; the CoCl 2 ·6H 2 O, or Co(NO 3 ) 2 ·6H 2 O, or Co(Ac) 2 4H 2 O, or CoSO 4 ·7H 2 O was added to the solution and continued to stir until the solution became transparent reddish brown, reacted the solution at a temperature of 160-220°C, cooled to room temperature, washed, dried and calcined to obtain spherical Co 3 V 2 o 8 , the experimental process of the present invention does not involve dangerous and toxic steps; the additives are simple and practical, and the experimental reproducibility rate is extremely high; the product has high purity, good crystallization performance, less post-processes, uniform product particle size distribution, and the synthesized product is solid within 1-3 μm Bulk structure, when used as a lithium battery negative electrode material, can significantly improve the diffusion ability of electrons and ions, has a high charge specific capacity and good discharge performance, very suitable as a lithium ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium battery materials, in particular to a spherical Co 3 V 2 o 8 and its preparation method. Background technique [0002] Due to the advantages of high voltage, high specific energy, wide operating temperature range, high specific power, and stable discharge, lithium batteries are widely used in various electronic products or devices. However, as the market requirements become higher and higher, it is necessary to find new Electrode materials to meet the growing demand for energy storage. [0003] The negative electrode material is the key factor to determine the lithium battery, so the development of negative electrode material becomes the key to improve the performance of lithium battery. co 3 V 2 o 8 Due to its unique crystal structure and high tap density, it is a very ideal negative electrode material and has a great application prospect in lithium-ion batteries. This solu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/052C01G51/00
CPCC01G51/00H01M4/5825H01M10/052Y02E60/10
Inventor 吴孟强杨俭陈诚冯婷婷
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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