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A kind of cobalt vanadate compound and its preparation method and application

A compound, cobalt vanadate technology, applied in cobalt compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of large capacity attenuation, large volume change, poor stability, etc., achieving easy materials, simple preparation methods, and easy operation. Effect

Active Publication Date: 2022-06-21
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, they have problems such as poor stability, large volume change, and large capacity fading in practical applications.

Method used

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  • A kind of cobalt vanadate compound and its preparation method and application
  • A kind of cobalt vanadate compound and its preparation method and application
  • A kind of cobalt vanadate compound and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The preparation method of cobalt vanadate compound, comprises the steps:

[0040] (1) respectively take by weighing ammonium metavanadate 0.6mmol, hexahydrate cobalt nitrate 1.2mmol and 2,2-bipyridine 1.0mmol with purity greater than 99.9% for subsequent use;

[0041] (2) place the weighed cobalt nitrate hexahydrate in a beaker, add 5.5ml of deionized water and stir for 10 minutes to form a homogeneous solution, add the weighed 2,2-bipyridine and ammonium metavanadate and stir for 30 minutes, to obtain a mixed solution;

[0042] (3) 1.2 mmol H 3 BO 3 Add to the above mixed solution to adjust the pH to 4.5, then transfer the solution to a 15ml hydrothermal reactor and heat to 170°C for 72h;

[0043] (4) cooling down to room temperature naturally, and then collecting after sonicating and drying at 80° C. for 12 hours to obtain the product;

[0044] (5) calcining the product at 600° C. for 4 hours in an air atmosphere with a heating rate of 2° C. / min to obtain the coba...

Embodiment 2

[0053] The preparation method of cobalt vanadate compound, comprises the steps:

[0054] (1) respectively take by weighing ammonium metavanadate 1.2mmol, hexahydrate cobalt nitrate 2.4mmol and 2,2-bipyridine 2.0mmol with purity greater than 99.9% for subsequent use;

[0055] (2) place the weighed cobalt nitrate hexahydrate in a beaker, add 11 ml of deionized water and stir for 8 minutes to form a homogeneous solution, add the weighed 2,2-bipyridine and ammonium metavanadate and stir for 25 minutes to obtain mixture;

[0056] (3) 2.4 mmol H 3 BO 3 Add to the above mixed solution to adjust the pH to 4, then transfer the solution to a 30ml hydrothermal reactor and heat to 160°C for 70h;

[0057] (4) cooling down to room temperature naturally, then collecting after sonicating and drying at 75°C for 10 hours to obtain the product;

[0058] (5) The product is calcined at 580°C for 3.5 hours in an air atmosphere, and the heating rate is 1.5°C / min to obtain the cobalt vanadate com...

Embodiment 3

[0062] The preparation method of cobalt vanadate compound, comprises the steps:

[0063] (1) respectively take by weighing ammonium metavanadate 1.2mmol, hexahydrate cobalt nitrate 2.4mmol and 2,2-bipyridine 2.0mmol with purity greater than 99.9% for subsequent use;

[0064] (2) place the weighed cobalt nitrate hexahydrate in a beaker, add 11 ml of deionized water and stir for 12 minutes to form a homogeneous solution, add the weighed 2,2-bipyridine and ammonium metavanadate and stir for 35 minutes to obtain mixture;

[0065] (3) 2.4 mmol H 3 BO 3 Add to the above mixed solution to adjust the pH to 6, then move the solution to a 30ml hydrothermal reactor and heat to 180°C for 74h;

[0066] (4) cooling down to room temperature naturally, and then collecting after sonicating and drying at 85° C. for 14 hours to obtain the product;

[0067] (5) calcining the product at 620° C. for 4.5 hours in an air atmosphere with a heating rate of 2.5° C. / min to obtain the cobalt vanadate ...

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Abstract

The invention discloses a cobalt vanadate compound, and the molecular formula of the cobalt vanadate compound is CoV 2 o 6 . and its preparation method, comprising the following steps: respectively weighing ammonium metavanadate, cobalt nitrate hexahydrate and 2,2-bipyridyl for subsequent use; placing cobalt nitrate hexahydrate in a beaker, adding deionized water and stirring evenly, adding the The 2,2 bipyridine and ammonium metavanadate that got were stirred to obtain a mixed solution; the H 3 BO 3 adding to the above mixed solution to adjust the pH, and then heating; cooling, ultrasonication, drying, and collecting to obtain the product; calcining the product under air to obtain the cobalt vanadate compound. The cobalt vanadate compound of the present invention is prepared from 2,2-bipyridine as a template, which has lower cost, environmental friendliness, higher discharge capacity and higher safety; as an electrode material, compared with single metal oxide Both metal oxides and heterometallic oxides have improved electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a cobalt vanadate compound and a preparation method and application thereof. Background technique [0002] Energy is the foundation for our survival and the driving force for the rapid development of human society. As a new energy source in the 21st century, lithium batteries are widely used in different fields such as electronic components, medical equipment, and household appliances. At present, the negative electrode of the industrialized lithium-ion battery is mainly graphite carbon negative electrode, and the maximum theoretical capacity is only 372mAh / g. Therefore, we are eager to find new energy materials to replace traditional graphite and improve the electrochemical performance of lithium-ion batteries. [0003] Transition metal oxides have attracted more and more attention because of their low cost, environmental friendliness, high theoretical an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/00H01M4/525H01M10/0525
CPCH01M4/525H01M10/0525C01G51/00C01P2002/72C01P2004/02C01P2006/40Y02E60/10
Inventor 王磊李斌杰孙静陈瑞欣韩吉姝
Owner QINGDAO UNIV OF SCI & TECH
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