Cobaltous oxide nanocrystal-graphene composite material and preparation method and application thereof

A cobaltous oxide nano-composite material technology, which is applied in electrical components, battery electrodes, non-aqueous electrolyte storage batteries, etc., can solve the problems of easy aggregation of cobaltous oxide nanoparticles

Inactive Publication Date: 2017-04-26
BEIJING NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Based on this, the embodiment of the present invention provides a cobaltous oxide nanocrystal-graphene composite material, its preparation method and application, to solve the problem that cobaltous oxide nanoparticles are easy to agglomerate in the air

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  • Cobaltous oxide nanocrystal-graphene composite material and preparation method and application thereof
  • Cobaltous oxide nanocrystal-graphene composite material and preparation method and application thereof
  • Cobaltous oxide nanocrystal-graphene composite material and preparation method and application thereof

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[0036] The embodiment of the present invention also provides a preparation method of the cobaltous oxide nanocrystal-graphene composite material, comprising the following steps:

[0037] 1), graphite oxide is added in the first organic solvent and dispersed;

[0038] 2) Add cobalt acetylacetonate and octadecylamine, heat the mixture to 120°C-140°C, keep it for 20-50 minutes, then raise the temperature until the solution boils and reflux, and keep it for 1-5 hours;

[0039] The ratio of the mass of graphite oxide to the amount of cobalt acetylacetonate is 10 mg / mmol to 40 mg / mmol; the mass ratio of graphite oxide to octadecylamine is 1:80 to 1:25;

[0040] 3), adding a second organic solvent to quench the reaction, separating the solid, washing and drying the solid;

[0041] 4) Heat-treating the dried solid in an inert gas for 1 hour to 3 hours; wherein, the temperature of the heat treatment is 350° C. to 450° C.

[0042] Wherein, the above-mentioned graphite oxide refers to a ...

Embodiment 1

[0054] Add 40mg of graphite oxide to 40mL of N-methylpyrrolidone, and disperse ultrasonically to obtain a uniformly dispersed brown solution;

[0055] Add 2mmol cobalt acetylacetonate and 2g octadecylamine to the above brown solution, first heat the mixture to 120°C and keep it warm for 30 minutes; then raise the temperature to 202°C and keep it warm for 2 hours; keep magnetic stirring during this process;

[0056] The reaction was quenched by adding 20 mL of ethanol, the solid was separated by centrifugation, washed alternately with n-hexane and acetone, and dried under vacuum at 40°C;

[0057] The dried solid was heat-treated at 400° C. for 1 hour in an argon atmosphere to obtain a cobaltous oxide nanocrystal-graphene composite material.

[0058] The cobaltous oxide nanocrystal-graphene composite material prepared in Example 1 of the present invention is analyzed below, and the analysis results obtained are as follows:

[0059] XRD analysis

[0060] figure 1 The XRD patte...

Embodiment 2

[0076] Add 40mg of graphite oxide to 40mL of oleylamine, and ultrasonically disperse to obtain a uniformly dispersed brown solution;

[0077] Add 1mmol cobalt acetylacetonate and 3.2g octadecylamine to the above brown solution, first heat the mixture to 120°C and keep it warm for 50 minutes; then raise the temperature to 290°C and keep it warm for 1 hour; keep magnetic stirring during this process;

[0078] The reaction was quenched by adding 20 mL of ethanol, the solid was separated by centrifugation, washed alternately with n-hexane and acetone, and dried under vacuum at 40°C;

[0079] The dried solid was heat-treated at 350° C. for 3 hours in an argon atmosphere to obtain a cobaltous oxide nanocrystal-graphene composite material.

[0080] XRD and XPS analysis show that the composite material is a cobaltous oxide nanocrystal-graphene composite material. Electron microscope image analysis shows that the graphene in the composite material is a sheet structure, and the cobaltou...

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Abstract

The embodiment of the invention provides a cobaltous oxide nanocrystal-graphene composite material. The embodiment of the invention further provides a preparation method of the composite material. The method comprises the following steps of (1) adding graphite oxide to a first organic solvent and dispersing the graphite oxide; (2) adding cobalt acetylacetonate and octadecylamine, heating a mixture to 120-140 DEG C, maintaining the temperature for 20-50 minutes, carrying out heating until the solution boils and reflows and maintaining the temperature for 1-5 hours; (3) adding the mixture to a second organic solvent to suddenly stop the reaction, separating solids and washing and drying the solids; and (4) carrying out thermal treatment on the dried solids in an inert gas for 1-3 hours. The embodiment of the invention further provides an application of the composite material in an organic system Li-O2 battery as an anode catalyst. According to the composite material provided by the embodiment of the invention, cobaltous oxide nanocrystal uniformly grows on a graphene substrate, the dispersity is good and the agglomeration phenomenon is avoided, so that the catalytic performance of the composite material is relatively good.

Description

technical field [0001] The present invention relates to Li-O 2 The field of battery technology, in particular, relates to cobaltous oxide nanocrystal-graphene composite material, its preparation method and application. Background technique [0002] In the past two years, driven by the rapid growth of the national economy, my country's energy demand has grown rapidly, and some regions have experienced energy tensions to varying degrees. It is imminent to seek an efficient and stable energy source to meet our growing energy demand. Lithium-ion batteries have been widely used in mobile electronic devices as a new generation of green high-energy batteries since Sony Corporation of Japan commercialized them in 1991. In recent years, with the expansion of the application of lithium-ion batteries in power equipment, electric vehicles and other fields, the traditional lithium-ion battery system has been unable to meet the demand. while Li-O 2 Because the battery has an ultra-high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/052
CPCH01M4/364H01M10/052Y02E60/10
Inventor 马淑兰袁萌伟杨燕孙根班
Owner BEIJING NORMAL UNIVERSITY
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