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Preparation method of cobalt selenide/graphite carbon composite material

A composite material and graphitic carbon technology, applied in electrochemical generators, structural parts, electrical components, etc., can solve the problems of inability to form homogeneous distribution, the current is suddenly large and small, and the electric shock capacity is small, and the preparation process is simple and feasible. , The effect of large electric shock capacity and small particle size

Inactive Publication Date: 2019-04-05
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To sum up, the preparation of cobalt selenide / graphite carbon composites still has low output, low crystallinity, inability to form a homogeneous distribution, small electric shock capacity, short life, poor stability during use, and sudden large and small currents. technical issues need to be resolved urgently

Method used

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  • Preparation method of cobalt selenide/graphite carbon composite material
  • Preparation method of cobalt selenide/graphite carbon composite material
  • Preparation method of cobalt selenide/graphite carbon composite material

Examples

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Embodiment 1

[0021] A preparation method of cobalt selenide / graphite carbon composite material, comprising the following steps:

[0022] 1) Preparation of polyhedral metal-organic framework compound ZIF-67: Weigh 4.9mmol Co(NO 3 ) 2 ·6H 2 O and 39.5mmol 2-methylimidazole were dissolved in 100ml methanol respectively, and the stirring speed was set to be 350r / min. After stirring and dissolving completely, the Co(NO 3 ) 2 · 6H 2 The O solution was poured into the 2-methylimidazole solution, stirred for 12 minutes, aged at room temperature for 20 hours after the stirring was stopped, and the product was centrifuged at a speed of 15000 r / min, and the centrifugation time was 5 minutes. After centrifugation, the precipitate was washed with methanol for 3 times. The amount of methanol used was 25 times the mass of the precipitate, and then placed at 60°C for 12 hours in a vacuum. The resulting product was a polyhedral metal-organic framework compound ZIF-67. The product was blue-purple in sha...

Embodiment 2

[0026] A preparation method of cobalt selenide / graphite carbon composite material, comprising the following steps:

[0027] 1) Preparation of polyhedral metal-organic framework compound ZIF-67: Weigh 5.5mmol Co(NO 3 ) 2 ·6H 2 O and 45mmol 2-methylimidazole were dissolved in 100ml methanol respectively, and the stirring speed was set to be 350r / min. After the stirring was completely dissolved, the Co(NO 3 ) 2 · 6H 2 The O solution was poured into the 2-methylimidazole solution, stirred for 15 minutes, aged at room temperature for 22 hours after the stirring was stopped, and the product was centrifuged at a speed of 16000 r / min, and the centrifugation time was 3 minutes. After centrifugation, the precipitate was washed with methanol for 3 times. The amount of methanol used is 20 times the mass of the precipitate, and then placed at 60°C for 12 hours in a vacuum. The product obtained is a polyhedral metal-organic framework compound ZIF-67. The product is blue-purple in shape,...

Embodiment 3

[0031] A kind of preparation method of building cobalt selenide / graphite carbon composite material, comprises the following steps:

[0032] 1) Preparation of polyhedral metal-organic framework compound ZIF-67: Weigh 6mmol Co(NO 3 ) 2 ·6H 2 O and 50mmol 2-methylimidazole were dissolved in 100ml methanol respectively, and the stirring speed was set to be 350r / min. After the stirring was completely dissolved, the Co(NO 3 ) 2 · 6H 2 Pour the O solution into the 2-methylimidazole solution, stir for 20min, stop stirring and age at room temperature for 24h, centrifuge the product, the centrifuge speed is 12000r / min, centrifuge for 7min, take the centrifugal precipitate and wash it with methanol for 3 times, the amount of methanol It is 30 times the mass of the precipitate, and then placed at 60°C for 12 hours in a vacuum. The obtained product is a polyhedral metal-organic framework compound ZIF-67. The product is blue-purple in shape, rhombic dodecahedron, and the particle size i...

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Abstract

The invention provides a preparation method of a cobalt selenide / graphite carbon composite material. With Co(NO3)2-6H2O, 2-methylimidazole, methanol and selenium powder as raw materials, through the preparation of a polyhedral metal organic framework compound ZIF-67, the cobalt selenide / graphite carbon composite material is prepared based on MOFs template construction. The ZIF-67 prepared by the invention is a rhombohedral dodecahedron, a framework has a small grain diameter controlled to be about 300nm and is uniform, the specific surface area is large, and the overall distribution is uniform. The composite material of the invention has high crystallinity and high specific surface area and porosity, the homogeneous distribution can be formed, the prepared framework has the small grain size, and the overall distribution is uniform. At the same time, the electric shock capacity is large, the service life is long, the lithium storage performance is excellent and is not degraded after upto 200 times of charging and discharging cycles, the stability of the use process is good, the current is not suddenly large and small, the purity of a product is high, the preparation method of the invention has high yield which can reach 70% or more, the preparation process is simple and feasible, and the method is worth marketing.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a method for preparing a cobalt selenide / graphite carbon composite material. Background technique [0002] Lithium-ion batteries stand out from many new energy sources due to their high energy density, long cycle life, and environmental friendliness, and are widely used in mobile electronic devices, new energy vehicles, and other fields. However, the negative electrode material of commercial lithium-ion batteries is graphite, and the theoretical capacity of graphite is only 372mAh / g, which cannot meet the capacity requirements of large electronic equipment such as electric vehicles, which limits the application and development of lithium-ion batteries. Therefore, scientists have developed a variety of negative electrode materials to improve the capacity of lithium-ion batteries, such as carbon materials, transition metal oxides, transition metal sulfides, transition metal s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/364H01M4/581H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 柳红东李宗阳伏春平胡荣阮海波刘佳黄佳木
Owner CHONGQING UNIV OF ARTS & SCI
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