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Flexible self-supporting composite electrode and preparation method and application thereof

A composite electrode and self-supporting technology, applied in the field of energy and materials, can solve the problems of unfavorable loading content of sulfur active substances, limited specific surface area, limited capacity, etc., and achieve the effects of reduced loss, simple preparation method, and easy operation

Active Publication Date: 2020-03-27
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the general three-dimensional carbon-based materials have a very limited specific surface area, which is not conducive to loading sulfur active substances with a high content, and the ability of non-polar carbon-based materials to inhibit the shuttle effect is very limited.

Method used

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  • Flexible self-supporting composite electrode and preparation method and application thereof
  • Flexible self-supporting composite electrode and preparation method and application thereof
  • Flexible self-supporting composite electrode and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Dissolve 1.3136g of 2-methylimidazole in 40mL of deionized water and stir magnetically for 30min to obtain a 2-methylimidazole solution; dissolve 0.5821g of cobalt nitrate hexahydrate in 40mL of deionized water and stir magnetically for 30min to obtain a cobalt nitrate solution. The cobalt nitrate solution and the 2-methylimidazole solution were quickly mixed and ultrasonicated for 1 min to obtain a uniformly mixed solution. Fix the carbon cloth on the glass slide, place it in the above mixed solution and let it stand for 2h. The carbon cloth was taken out, rinsed with deionized water, and dried at 60°C for 24 hours to obtain a precursor grown on the carbon cloth in the form of a nanosheet array.

[0035] Place the carbon cloth grown with the precursor in a tube furnace at 10% H 2 / Ar atmosphere, the temperature was first raised to 350°C at a heating rate of 2°C / min, then raised to 850°C at a heating rate of 5°C / min and kept for 2 hours, and finally cooled to 500°C at ...

Embodiment 2

[0041] Dissolve 1.3136g of 2-methylimidazole in 40mL of deionized water and stir magnetically for 30min to obtain a 2-methylimidazole solution; dissolve 0.5821g of cobalt nitrate hexahydrate in 40mL of deionized water and stir magnetically for 30min to obtain a cobalt nitrate solution. The cobalt nitrate solution and the 2-methylimidazole solution were quickly mixed and ultrasonicated for 1 min to obtain a uniformly mixed solution. The graphene foam was fixed on a glass slide, and placed in the above mixed solution for 4 h. Then the graphene foam was taken out, rinsed with deionized water, and dried at 60°C for 24 hours to obtain a precursor grown on the graphene foam in the form of a nanosheet array.

[0042] The graphene foam grown with the precursor was placed in a tube furnace under 10% H 2 / Ar atmosphere, the temperature was first raised to 300°C at a heating rate of 1°C / min, then raised to 900°C at a heating rate of 5°C / min, kept for 1.5 hours, and finally cooled to 500...

Embodiment 3

[0047] Dissolve 1.3136g of 2-methylimidazole in 40mL of deionized water and stir magnetically for 30min to obtain a 2-methylimidazole solution; dissolve 0.5821g of cobalt nitrate hexahydrate in 40mL of deionized water and stir magnetically for 30min to obtain a cobalt nitrate solution. The cobalt nitrate solution and the 2-methylimidazole solution were quickly mixed and ultrasonicated for 1 min to obtain a uniformly mixed solution. Fix the carbon cloth on the glass slide, place it in the above mixed solution and let it stand for 1h. Then the carbon cloth was taken out, rinsed with deionized water, and dried at 60 °C for 24 h to obtain a precursor grown on the carbon cloth in the form of a nanosheet array.

[0048] Place the carbon cloth grown with the precursor in a tube furnace at 10% H 2 / Ar atmosphere, first raise the temperature to 350°C at a heating rate of 2°C / min, then raise the temperature to 850°C at a heating rate of 5°C / min, keep the temperature for 2 hours, and fi...

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Abstract

The invention discloses a flexible self-supporting composite electrode which is a composite material composed of a carbon-based current collector, cobalt phosphide growing on the current collector insitu and nitrogen-doped carbon. The cobalt phosphide / nitrogen-doped carbon grows on the carbon-based current collector in situ in the form of a nanosheet array. The invention further discloses a preparation method of the flexible self-supporting composite electrode. The method comprises the following steps of mixing a cobalt nitrate solution and a 2-methylimidazole solution in an isopyknic mannerto obtain a solution, placing the carbon-based current collector in the solution, standing for 1-4 hours, washing with the deionized water, drying to obtain the carbon-based current collector with a precursor grown in situ, and calcining in an H2 / Ar atmosphere to obtain a carbon-based current collector sample with metal cobalt / nitrogen-doped carbon grown; and in the inert atmosphere, phosphatizingthe carbon-based current collector sample on which the metal cobalt / nitrogen-doped carbon grows and NaH2PO2. The electrode disclosed by the invention is used as the positive electrode material of thelithium-selenium sulfide battery, shows the excellent electrochemical performance and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of materials and energy, and relates to a flexible self-supporting composite electrode and its preparation method and application, in particular to a self-supporting cobalt phosphide / nitrogen-doped carbon sheet array electrode and its preparation method and application. Background technique [0002] As a new generation of energy storage products, lithium-sulfur batteries have the characteristics of high energy density, abundant raw material reserves, simple and easy manufacture, and environmental friendliness, and have very bright prospects. Sulfur is a nearly insulating substance with extremely low conductivity. The shuttle effect during the charge-discharge reaction causes serious attenuation of battery cycle capacity and poor cycle stability. These problems limit the industrialization process of lithium-sulfur batteries. In order to suppress the shuttle effect, physical barrier or chemical adsorption is g...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/66H01M10/052B82Y30/00B82Y40/00
CPCH01M4/62H01M4/667H01M4/663H01M10/052B82Y30/00B82Y40/00Y02E60/10
Inventor 王瑾杨浩王勇
Owner NANJING UNIV OF TECH
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