Cobalt sulfide-based composite material as well as preparation method and application thereof

A composite material, cobalt sulfide-based technology, applied in the direction of cobalt sulfide, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve the problems of complex preparation process, etc., to achieve easy access to raw materials, mild conditions, Effects on Improving Electron Transfer Kinetics

Active Publication Date: 2020-07-03
东北大学秦皇岛分校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It specifically involves the preparation of the precursor of ZIF-67 and the related preparation method of vulcanization by chemical vapor deposition, the preparation process is complex

Method used

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  • Cobalt sulfide-based composite material as well as preparation method and application thereof
  • Cobalt sulfide-based composite material as well as preparation method and application thereof
  • Cobalt sulfide-based composite material as well as preparation method and application thereof

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preparation example Construction

[0058] Wherein in the preparation of ZIF-67 derived cobalt sulfide, the present invention first uses precipitation method to C 4 h 6 N 2 and Co(NO 3 ) 2 ·6H 2 O is used as a raw material to prepare the ZIF-67 precursor, and then under the protection of argon, the temperature is maintained at a temperature range of 850-950°C at a temperature increase rate of 1-10°C / min for 1.5-2.5 hours. The material gradually forms a nitrogen Doped carbon-coated cobalt-based nanomaterials Co@NC-(850-950).

[0059] Then take the prepared 1-1.5g Co@NC-(850-950) as the Co source, 3.5-4.5g sublimated sulfur as the S source, mix the two materials fully, put them into a sealed porcelain boat, and then put them into the tube type in the furnace.

[0060] Pass argon gas into the tube furnace for 0.5h-1.5h to ensure an inert atmosphere, then set the temperature rise program, the temperature rise rate is 1-10°C / min, the holding temperature is 300°C-600°C, and a specific temperature is selected for...

Embodiment 1

[0062] Will Co(NO 3 ) 2 ·6H 2 Add 200ml of methanol to O and 2-methylimidazole in a ratio of 1:4 to form methanol solutions of cobalt nitrate hexahydrate and 2-methylimidazole. The specific method is as follows:

[0063] Weigh 2.35g of Co(NO 3 ) 2 ·6H 2 O, 2.68 g of 2-methylimidazole was added to 200 ml of methanol respectively to form a methanol solution of cobalt nitrate hexahydrate and 2-methylimidazole. After the prepared two methanol solutions were vigorously stirred for 30 min, the methanol solution of 2-methylimidazole was quickly poured into the Co(NO 3 ) 2 ·6H 2 In the methanol solution of O, the mixture of the two was vigorously stirred for 1 h, then the stirring was stopped, and the reaction was allowed to stand at room temperature for 24 h.

[0064] After the reaction is completed, stir for 5min-10min, centrifuge at 6000rpm for 5min, discard the supernatant, wash the ZIF-67 obtained after centrifugation alternately with ethanol and deionized water, and dry...

Embodiment 2

[0067] Weigh 1 g of Co@NC-900 composite material prepared in Example 1 as cobalt source, and 4 g of sublimed sulfur powder as sulfur source. Mix the two powders evenly, put them into a porcelain boat sealed with a cover plate, and transfer them to a tube furnace. Before setting the temperature control program, argon gas is preliminarily passed for 1 hour to remove the internal air and create a combined protection environment of inert gas. Then set the temperature control program to raise the temperature at a heating rate of 5°C / min, keep it at a temperature of 300-600°C for 2 hours, and wait for the tube furnace to cool down to room temperature naturally after the heat preservation is completed.

[0068] The obtained black powder is the cobalt sulfide-based composite material. If it is calcined at 400°C, it is CoS 2 @NC-400.

[0069] Figure 5 XRD patterns of cobalt sulfide-based composites obtained from cobalt source and sulfur source at different calcination temperatures....

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Abstract

The invention provides a cobalt sulfide-based composite material as well as a preparation method and application thereof. The cobalt sulfide-based composite material is CoS2NC, the preparation methodof the cobalt sulfide-based composite material comprises the following steps: (1) synthesizing a ZIF-67 precursor by using a precipitation method; (2) transferring the ZIF-67 precursor into a tubularfurnace, and calcining the ZIF-67 precursor in an inert gas environment to obtain a nitrogen-doped carbon-coated cobalt-based nano material CoNC; and (3) taking the nitrogen-doped carbon-coated cobalt-based nano material CoNC as a Co source, taking sulfur powder as a sulfur source, fully mixing the Co source and the sulfur source, and carrying out secondary calcination under the protection of inert gas to obtain the cobalt sulfide-based composite material. The cobalt sulfide-based composite material prepared by the method is good in electrochemical performance, high in specific surface area and good in crystallinity; when applied to the lithium-air battery, the material has high specific capacity and cycle performance, and the preparation method is simple and suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of new energy storage materials, in particular to a cobalt sulfide-based composite material and a preparation method and application thereof. Background technique [0002] Among the currently researched new secondary battery systems, the lithium-air battery has a capacity of up to 11400Wh kg -1 The theoretical energy density has attracted extensive attention of researchers. However, there are still some key problems in lithium-air batteries that have not been resolved, among which the positive electrode problem is the most prominent. The fundamental reason why the positive electrode has become a limit to the development of lithium-air batteries is that the kinetics of the reaction is too slow, which leads to a series of problems such as low energy efficiency and short cycle life. In order to solve the above problems, the most convenient and effective way is to improve the kinetics of electron transfer by synthesizin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M12/08C01G51/00B82Y30/00B82Y40/00C08G83/00
CPCB82Y30/00B82Y40/00C01G51/30C01P2002/72C01P2004/03C01P2004/04C01P2004/62C01P2006/12C01P2006/17C01P2006/40C08G83/008H01M4/8647H01M12/08H01M2004/8689
Inventor 罗绍华战洋张亚辉王庆刘忻闫绳学冯建田勇李辉诸葛福长
Owner 东北大学秦皇岛分校
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