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Lamellar zinc-cobalt sulfide composite material based on MOFs, and preparation method and application thereof

A composite material and sulfide technology, applied in the direction of active material electrodes, electrochemical generators, electrical components, etc., can solve the problems of large material volume changes, poor structural stability, and reduced cycle performance, and increase the contact area , enhanced conductivity, high specific capacity effect

Active Publication Date: 2019-10-18
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 composite material based on MOFs, and preparation method and application thereof
  • Lamellar zinc-cobalt sulfide composite material based on MOFs, and preparation method and application thereof
  • Lamellar zinc-cobalt sulfide composite material based on MOFs, and preparation method and application thereof

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 a preparation method and an application thereof. The preparation method comprises the following steps: 1) synthesizing a white Zn MOFs nanosheet as a precursor; 2) adding white powder into an ethanol solution containing cobalt nitrate hexahydrate to obtain pinkish purple CO / Zn MOFs powder; and 3) performing two-step calcination and vulcanization on the pinkish purple powder in an inert atmosphere to obtain the ZnCoS@CNS composite material, namely, the lamellar zinc-cobalt sulfide composite material based on the MOFs. The ZnCoS@CNS composite material prepared by the method has a lamellar structure, so that the contact area of an electrolyte solution and the material can be enlarged, the transmissionof lithium ions is promoted, and meanwhile, a space is provided for the change of the volume of the material in a lithium intercalation / deintercalation process. When the material is used as a negative electrode material of a lithium ion battery, the material shows relatively good 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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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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