Preparation method of cobalt disulfide/carbon hollow nanoflower composite material and prepared composite material

A composite material, hollow nanotechnology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as hindering the continuous application of cobalt disulfide, low electronic conductivity, poor cycle stability, etc. , to achieve the effect of improving electrochemical stability, large specific surface area, and increasing effective contact

Active Publication Date: 2021-03-26
WEIFANG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cobalt disulfide sodium ion battery negative electrode materials prepared in the prior art all appear to cause large volume expansion in the process of de / intercalating sodium ions and make it have poor cycle stability, while cobalt disulfide is low. The high electronic conductivity makes it have serious polarization phenomenon in the case of high current charge and discharge, and then has problems such as low rate performance.
These problems have seriously hindered the continued application of cobalt disulfide in the field of sodium-ion batteries

Method used

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  • Preparation method of cobalt disulfide/carbon hollow nanoflower composite material and prepared composite material
  • Preparation method of cobalt disulfide/carbon hollow nanoflower composite material and prepared composite material
  • Preparation method of cobalt disulfide/carbon hollow nanoflower composite material and prepared composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Add 0.4 ml of tetraethyl orthosilicate dropwise to a mixed solution of 10 ml of water and 70 ml of absolute ethanol, then add 6 ml of ammonia solution and stir for 2 hours, and the resulting precipitate is centrifuged, washed, and dried to obtain a uniform size of silica nanospheres;

[0046] (2) Ultrasonic disperse 0.4 gram of silica nanospheres prepared in step (1) into 60 milliliters of deionized water, then add 2 grams of urea and 0.002 mol of cobalt nitrate and stir to obtain a mixed solution;

[0047] (3) Move the mixed solution obtained in step (2) into the reaction kettle, then place the reaction kettle in a drying oven for 100°C hydroheating, and centrifuge, wash and dry the obtained precipitate to obtain silicic acid with a core-shell structure Cobalt salt / silica composite;

[0048] (4) Disperse 0.4 gram of cobalt silicate / silicon dioxide composite material with core-shell structure obtained in step (3) in 300 milliliters of deionized water, then add 0.00...

Embodiment 2

[0053] (1) Add 0.4 ml of tetraethyl orthosilicate dropwise to a mixed solution of 10 ml of water and 70 ml of absolute ethanol, then add 6 ml of ammonia solution and stir for 2 hours, and the resulting precipitate is centrifuged, washed, and dried to obtain a uniform size of silica nanospheres;

[0054] (2) ultrasonically disperse 0.4 gram of silica nanospheres prepared in step (1) into 60 milliliters of deionized water, then add 2 grams of urea and 0.002 mol of cobalt chloride and stir to obtain a mixed solution;

[0055] (3) Move the mixed solution obtained in step (2) into the reaction kettle, then place the reaction kettle in a drying oven for 90°C hydroheating, and centrifuge, wash and dry the obtained precipitate to obtain silicic acid with a core-shell structure Cobalt salt / silica composite;

[0056] (4) Disperse 0.4 gram of cobalt silicate / silicon dioxide composite material with core-shell structure obtained in step (3) in 300 ml of deionized water, then add 0.0016mol...

Embodiment 3

[0061] (1) Add 0.4 ml of tetraethyl orthosilicate dropwise to a mixed solution of 10 ml of water and 70 ml of absolute ethanol, then add 6 ml of ammonia solution and stir for 2 hours, and the resulting precipitate is centrifuged, washed, and dried to obtain a uniform size of silica nanospheres;

[0062] (2) ultrasonically disperse 0.4 gram of silica nanospheres prepared in step (1) into 60 milliliters of deionized water, then add 2 grams of urea and 0.0025 mol of cobalt nitrate for stirring to obtain a mixed solution;

[0063] (3) Move the mixed solution obtained in step (2) into the reaction kettle, then place the reaction kettle in a drying oven for 90°C hydroheating, and centrifuge, wash and dry the obtained precipitate to obtain silicic acid with a core-shell structure Cobalt salt / silica composite;

[0064] (4) Disperse 0.4 gram of cobalt silicate / silicon dioxide composite material with core-shell structure obtained in step (3) in 300 milliliters of deionized water, then ...

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Abstract

The invention relates to the technical field of sodium ion battery negative electrode materials, in particular to a preparation method of a cobalt disulfide / carbon hollow nanoflower composite materialand the prepared composite material. Cobalt silicate nanosheets grow on the surfaces of silicon dioxide spheres in situ through a template method, then the surfaces of the cobalt silicate are coatedwith polydopamine, in the later heat treatment process, carbon generated through the carbonization of the polydopamine is adsorbed to the surfaces of the cobalt silicate nanosheets, and the carbon nanoflower shape is integrally formed; a cobalt precursor obtained by partially reducing cobalt silicate by carbon grows on carbon nanoflowers in situ, the cobalt precursor generates nanoscale cobalt disulfide under the vulcanization action, hydrofluoric acid and silicon dioxide react to remove a template, and the cobalt disulfide / carbon hollow nanoflower composite material is obtained. The cobalt disulfide / carbon nanoflower composite material prepared by the invention has excellent cycling stability and rate capability as a sodium ion battery negative electrode material.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for sodium ion batteries, in particular to a method for preparing a cobalt disulfide / carbon hollow nanoflower composite material. Background technique [0002] Energy is the material basis supporting the progress of the entire human civilization. In recent decades, in order to avoid the depletion of non-renewable energy resources such as coal, oil, and natural gas, renewable new energy sources such as wind energy, solar energy, tidal energy, and lithium-ion batteries have been extensively studied. Among them, due to the advantages of high energy density, no memory effect, small self-discharge, and flexible application, lithium-ion batteries have been extensively studied and successfully commercialized. However, due to the small and uneven distribution of lithium storage on the earth, with the widespread application of lithium-ion batteries, the demand for lithium sources cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36B82Y30/00B82Y40/00H01M4/58H01M4/587H01M4/62H01M10/054
CPCH01M4/364H01M4/587H01M4/5815H01M10/054H01M4/625B82Y40/00B82Y30/00Y02E60/10
Inventor 王冠琴闫洋洋谢凯谭秀峰张杰
Owner WEIFANG UNIV OF SCI & TECH
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