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Lamellar zinc-cobalt sulfide composites based on mofs and its preparation and application

A composite material and sulfide technology, used in active material electrodes, electrochemical generators, structural parts, etc., can solve the problems of large volume change of materials, poor structural stability, shortened battery life, etc., and increase the contact area. , the effect of enhancing electrical conductivity and good cycle performance

Active Publication Date: 2022-05-10
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the cycle, the volume of the material changes greatly, which will deteriorate the structural stability, reduce the cycle performance, and shorten the battery life.

Method used

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  • Lamellar zinc-cobalt sulfide composites based on mofs and its preparation and application
  • Lamellar zinc-cobalt sulfide composites based on mofs and its preparation and application
  • Lamellar zinc-cobalt sulfide composites based on mofs and its preparation and application

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A method for preparing a MOFs-based lamellar zinc-cobalt sulfide composite material, comprising the following steps:

[0032] (1) Dissolve 0.33g of zinc nitrate hexahydrate into 90mL of deionized water, and then add the solution to 90mL of an aqueous solution containing 0.985g of 2-methylimidazole under stirring (the moles of 2-methylimidazole and zinc nitrate hexahydrate ratio of 10.814:1), stirred for 24 hours to obtain a white precipitate, centrifuged, washed 5 times with distilled water, and dried in air at 80°C for 12 hours;

[0033] (2) Add 0.08g white Zn MOFs to 25mL ethanol solution containing 0.08g cobalt nitrate hexahydrate (the mass ratio of cobalt nitrate hexahydrate and white Zn MOFs is 1:1), the solution is ultrasonicated for 20min, stirred for 10min, then centrifuged 1. Dry in ambient air at 80°C for 12h to obtain pinkish purple powder Co / Zn MOFs;

[0034] (3) Place the Co / Zn MOFs in (2) in a ceramic crucible at 700 °C, N 2 In the atmosphere, the heatin...

Embodiment 2

[0043] A preparation method of MOFs-based lamellar zinc-cobalt sulfide composite material Z2, comprising the following steps:

[0044] (1) Dissolve 0.33g of zinc nitrate hexahydrate into 90mL of deionized water, and then add the solution to 90mL of an aqueous solution containing 0.455g of 2-methylimidazole under stirring (the moles of 2-methylimidazole and zinc nitrate hexahydrate ratio of 5:1), stirred for 24 hours to obtain a white precipitate, centrifuged, washed 5 times with distilled water, and dried in ambient air at 80°C for 12 hours;

[0045] (2) Add 0.08g white Zn MOFs to 25mL ethanol solution containing 0.08g cobalt nitrate hexahydrate (the mass ratio of cobalt nitrate hexahydrate and white Zn MOFs is 1:1), the solution is ultrasonicated for 20min, stirred for 10min, and then centrifuged , dried in ambient air at 80°C for 12h to obtain pinkish purple powder Co / Zn MOFs;

[0046] (3) Place the Co / Zn MOFs in (2) in a ceramic crucible at 700 °C, N 2 In the atmosphere, ...

Embodiment 3

[0050] A preparation method of MOFs-based lamellar zinc-cobalt sulfide composite material Z3, comprising the following steps:

[0051] (1) Dissolve 0.33g of zinc nitrate hexahydrate into 90mL of deionized water, and then add the solution to 90mL of an aqueous solution containing 1.822g of 2-methylimidazole under stirring (the moles of 2-methylimidazole and zinc nitrate hexahydrate ratio of 20:1), stirred for 24 hours to obtain a white precipitate, centrifuged, washed 5 times with distilled water, and dried in ambient air at 80°C for 12 hours;

[0052] (2) Add 0.08g of white Zn MOFs to 25mL ethanol solution containing 0.08g of cobalt nitrate hexahydrate, ultrasonicate the solution for 20min, stir for 10min, then centrifuge, and dry in ambient air at 80°C for 12h to obtain pink-purple powder Co / ZnMOFs;

[0053] (3) Place the Co / Zn MOFs in (2) in a ceramic crucible at 700 °C, N 2 In the atmosphere, the heating rate is 2°C / min, calcined for 2 hours, and black powder is obtained...

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Abstract

The invention discloses a lamellar zinc-cobalt sulfide composite material based on MOFs and its preparation and application. The preparation method includes: 1) synthesizing white Zn MOFs nanosheets as a precursor; 2) adding the white powder to six A pinkish purple Co / Zn MOFs powder was obtained from an ethanol solution of hydrated cobalt nitrate; 3) the above pinkish purple powder was calcined in two steps and simultaneously vulcanized under an inert atmosphere to obtain a ZnCoS@CNS composite material, that is, the MOFs-based lamellar zinc Cobalt sulfide composites. The ZnCoS@CNS composite material prepared by this method has a lamellar structure, which can increase the contact area between the electrolyte and the material, promote the transport of lithium ions, and provide space for the volume change of the material during the lithium intercalation / delithiation process. When the material is used as a negative electrode material of a lithium ion battery, it exhibits better lithium storage performance.

Description

Technical field: [0001] The invention relates to a lamellar zinc-cobalt sulfide composite material based on MOFs and its preparation and application, belonging to the technical field of zinc-cobalt sulfide composite materials. Background technique [0002] In recent years, due to the sharp reduction of non-renewable fossil energy and the serious environmental pollution caused by burning fossil fuels, people are forced to develop renewable clean energy. Renewable energy sources such as wind and solar energy are environmentally friendly and economical to power future societies, but these intermittent renewable energy sources require efficient energy storage and conversion systems. Lithium-ion batteries have been widely used as power storage and conversion systems in portable electronic devices, electric vehicles, aerospace, etc. due to their advantages of high energy density, long cycle life and no memory effect. Currently used as negative electrode materials for lithium-ion ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5815H01M4/625H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 陈金喜任姣姣
Owner SOUTHEAST UNIV
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