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Zinc-cobalt sulfide/nitrogen-doped carbon composite material and preparation method and application thereof

A technology of nitrogen-doped carbon and composite materials, which is applied in the field of nanomaterials and electrochemistry, can solve the problems of capacity fading, low conductivity and ion diffusion rate, and achieve high power density, shorten diffusion distance, and buffer volume change.

Active Publication Date: 2018-07-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the key problems restricting its wide application are: low electrical conductivity and ion diffusion rate; the huge volume change in the process of lithium ion intercalation and extraction leads to structural crushing and rapid capacity decay.

Method used

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  • Zinc-cobalt sulfide/nitrogen-doped carbon composite material and preparation method and application thereof
  • Zinc-cobalt sulfide/nitrogen-doped carbon composite material and preparation method and application thereof
  • Zinc-cobalt sulfide/nitrogen-doped carbon composite material and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: the preparation method of the zinc-cobalt sulfide / nitrogen-doped carbon composite material of egg yolk shell structure, it comprises the steps:

[0034] 1) Dissolve 1 mmol of zinc nitrate hexahydrate and 3 mmol of cobalt nitrate hexahydrate in 40 ml of methanol, and stir until completely dissolved;

[0035] 2) Dissolve 12mmol dimethylimidazole in 40ml methanol and stir until completely dissolved;

[0036] 3) Slowly add the solution obtained in step 1) dropwise to the solution obtained in step 2), and stir and react for 24 hours;

[0037] 4) The product obtained in step 3) was centrifuged, washed three times with absolute ethanol, and dried in an oven at 60-80°C to obtain a precursor;

[0038] 5) Dissolve 1 mmol tris in 100 ml of absolute ethanol and stir until completely dissolved;

[0039] 6) Add 80 mg of the precursor obtained in step 4) to the solution obtained in step 5), and stir until completely dissolved;

[0040] 7) Add 40 mg of dopamine hydroch...

Embodiment 2

[0047] 1) Dissolve 1 mmol of zinc nitrate hexahydrate and 4 mmol of cobalt nitrate hexahydrate in 50 ml of methanol, and stir until completely dissolved;

[0048] 2) Dissolve 12mmol dimethylimidazole in 40ml methanol and stir until completely dissolved;

[0049] 3) Slowly add the solution obtained in step 1) dropwise to the solution obtained in step 2), and stir and react for 25 hours;

[0050] 4) The product obtained in step 3) was centrifuged, washed three times with absolute ethanol, and dried in an oven at 60-80°C to obtain a precursor;

[0051] 5) Dissolve 1 mmol tris in 100 ml of absolute ethanol and stir until completely dissolved;

[0052] 6) Add 80 mg of the precursor obtained in step 4) to the solution obtained in step 5), and stir until completely dissolved;

[0053] 7) Add 40 mg of dopamine hydrochloride to the solution obtained in step 6), and stir and react for 3 hours;

[0054] 8) centrifuging the product obtained in step 7), washing with absolute ethanol for...

Embodiment 3

[0058] 1) Dissolve 2 mmol of zinc nitrate hexahydrate and 3 mmol of cobalt nitrate hexahydrate in 50 ml of methanol, and stir until completely dissolved;

[0059] 2) Dissolve 12mmol dimethylimidazole in 40ml methanol and stir until completely dissolved;

[0060] 3) Slowly add the solution obtained in step 1) dropwise to the solution obtained in step 2), and stir and react for 25 hours;

[0061] 4) The product obtained in step 3) was centrifuged, washed three times with absolute ethanol, and dried in an oven at 60-80°C to obtain a precursor;

[0062] 5) Dissolve 1 mmol tris in 100 ml of absolute ethanol and stir until completely dissolved;

[0063] 6) Add 80 mg of the precursor obtained in step 4) to the solution obtained in step 5), and stir until completely dissolved;

[0064] 7) Add 40 mg of dopamine hydrochloride to the solution obtained in step 6), and stir and react for 3 hours;

[0065] 8) centrifuging the product obtained in step 7), washing with absolute ethanol for...

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Abstract

The invention belongs to the technical field of nanomaterials and electrochemistry and particularly relates to a preparation method of a zinc-cobalt sulfide / nitrogen-doped carbon composite material with a yolk-shell structure. The material can be used as a negative active material for a long-life and high-rate lithium-ion battery; the material has the yolk-shell structure of employing zinc-cobaltsulfide as a core and nitrogen-doped carbon as a shell and the size is 100-200nm, wherein the size of the zinc-cobalt sulfide is 80-100nm and the thickness of the carbon shell is 10-20nm. The zinc-cobalt sulfide / nitrogen-doped carbon composite material has the beneficial effects that the advantages of a metal-organic framework are utilized, a target product is obtained only through three steps ofprecursor preparation, carbon coating and vulcanization and calcination, the prepared material is high in productivity, good in stability and high in repeatability, and efforts are made for exploration of large-scale synthesized high-rate characteristic nanomaterials with excellent performance.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, and in particular relates to a method for preparing a zinc-cobalt sulfide / nitrogen-doped carbon composite material with an egg yolk shell structure, which can be used as a long-life, high-rate lithium-ion battery negative electrode active material. Background technique [0002] As the global economic and environmental problems become more and more severe, it is particularly important to develop energy storage devices with high efficiency and environmental friendliness. Lithium-ion batteries are considered to be the most potential energy storage systems because of their advantages such as high energy density, high safety, environmental friendliness, small memory effect, and low self-discharge rate. Lithium-ion batteries have been widely used in portable electronic devices such as mobile phones and notebook computers. However, in order to meet the current large-scale ene...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5815H01M4/583H01M10/0525Y02E60/10
Inventor 麦立强韦秀娟张延博安琴友
Owner WUHAN UNIV OF TECH
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