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Preparation method and application of in-situ carbon-coated cobalt selenide nano materials

A nano-material and carbon-coated technology, which is applied in the preparation and application of cobalt selenide electrode materials, can solve the problems of cumbersome experimental process, low yield, and high cost, and achieve improved stability and conductivity, high capacity, long-term The effect of cycle life

Inactive Publication Date: 2019-04-05
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the design and synthesis of cobalt selenide materials with both nanostructure and carbon coating is cumbersome, time-consuming, costly and low yield.

Method used

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  • Preparation method and application of in-situ carbon-coated cobalt selenide nano materials
  • Preparation method and application of in-situ carbon-coated cobalt selenide nano materials
  • Preparation method and application of in-situ carbon-coated cobalt selenide nano materials

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Embodiment 1

[0020] A method for preparing in-situ carbon-coated cobalt selenide nanomaterials. In this method, without adding any template agent or surfactant, firstly, a one-dimensional rod-shaped precursor is synthesized by hydrothermal method, and then simultaneously Cobalt selenide nanomaterials were prepared by carbon coating and selenization. Specific steps are as follows:

[0021] 1) Weigh 1.5g cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) and 0.6 g of nitrogen triacetic acid (NTA) were dissolved in a mixed solution of 30 mL of distilled water and 10 mL of isopropanol, and stirred evenly to obtain a pink solution.

[0022] 2) Transfer the above mixed solution to a 50mL stainless steel autoclave, put it in a constant temperature oven at 180°C for 6 hours, and after cooling to room temperature, filter the obtained product with suction, and wash it with distilled water and absolute ethanol several times, and put it in a vacuum Drying in an oven yields a pink precursor.

[0023] 3) ...

Embodiment 2

[0029] A method for preparing in-situ carbon-coated cobalt selenide nanomaterials. In the method, without adding any template agent or surfactant, firstly, a one-dimensional rod-shaped precursor is synthesized by hydrothermal method, and then simultaneously Cobalt selenide nanomaterials were prepared by carbon coating and selenization. Specific steps are as follows:

[0030] 1) Weigh 1.5g cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) and 0.6 g of nitrogen triacetic acid (NTA) were dissolved in a mixed solution of 20 mL of distilled water and 20 mL of isopropanol, and stirred evenly to obtain a pink solution.

[0031] 2) Transfer the above mixed solution to a 50mL stainless steel autoclave, put it in a constant temperature oven at 180°C for 6 hours, and after cooling to room temperature, filter the resulting product with suction, wash it with distilled water and absolute ethanol several times, and put it in a vacuum Drying in an oven yields a pink precursor.

[0032] 3) Mix ...

Embodiment 3

[0034] A method for preparing in-situ carbon-coated cobalt selenide nanomaterials. In the method, without adding any template agent or surfactant, firstly, a one-dimensional rod-shaped precursor is synthesized by hydrothermal method, and then simultaneously Cobalt selenide nanomaterials were prepared by carbon coating and selenization. Specific steps are as follows:

[0035] 1) Weigh 1.5g cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) and 0.6 g of nitrogen triacetic acid (NTA) were dissolved in a mixed solution of 10 mL of distilled water and 30 mL of isopropanol, and stirred evenly to obtain a pink solution.

[0036] 2) Transfer the above mixed solution to a 50mL stainless steel autoclave, put it in a constant temperature oven at 180°C for 6 hours, and after cooling to room temperature, filter the resulting product with suction, wash it with distilled water and absolute ethanol several times, and put it in a vacuum Drying in an oven yields a pink precursor.

[0037] 3) Mix ...

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Abstract

The invention provides a preparation method and application of in-situ carbon-coated cobalt selenide nano materials. The method synthesizes a one-dimensional rod-like precursor by a hydrothermal method without adding any template or surfactant, and then prepares the cobalt selenide nanorod materials by simultaneous in-situ carbon coating and selenization. The method solves the problems such as high cost, complicated process and uneven coating of common carbon coating, and uniformly coats a layer of amorphous carbon around the cobalt selenide nanoparticles by the in-situ carbon coating method,thereby improving the stability and conductivity of the cobalt selenide materials. And the prepared cobalt selenide is in a rod-like structure with controlled size and length. The obtained carbon-coated cobalt selenide nano materials, used as negative electrode material for sodium ion batteries, exhibit high capacity, long cycle life and excellent rate performance. The preparation method has the advantages of simple process, low cost, high yield and good repeatability, and has very high practical value.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for sodium ion batteries, and in particular relates to the preparation and application of an in-situ carbon-coated cobalt selenide (CoSe@C) electrode material. Background technique [0002] With the advent of the era of electric vehicles and smart grids, people's demand for electronic products continues to increase, so it is particularly important to develop low-cost electrical energy storage devices. However, the shortage of lithium resources and rising prices severely restrict the development of the new energy industry, which makes the development of other cheap energy storage battery systems that can replace lithium-ion batteries become a research hotspot. Sodium and lithium belong to the same main group, have similar physical and chemical properties, and have similar intercalation mechanisms in electrochemical reactions, making it possible to use similar compounds as electrode mater...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y30/00
CPCB82Y30/00H01M4/366H01M4/581H01M4/625H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 王一菁袁华堂焦丽芳王梦莹安翠华
Owner NANKAI UNIV
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