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Cobalt nickel selenide nitrogen-doped amorphous carbon nano composite negative electrode material as well as preparation and application thereof

A technology of cobalt-nickel-nitrogen selenide and amorphous carbon, which is applied in the field of materials, can solve the problems of many impurities and reduce the sodium storage performance of materials, and achieve the effects of enhancing sodium storage performance, facilitating transmission, and increasing electrical conductivity

Active Publication Date: 2020-08-18
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The intermediate product in the patent CN105609322B is directly selenized without washing and drying, and the final product obtained has many impurities, which will greatly reduce the sodium storage performance of the material

Method used

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  • Cobalt nickel selenide nitrogen-doped amorphous carbon nano composite negative electrode material as well as preparation and application thereof
  • Cobalt nickel selenide nitrogen-doped amorphous carbon nano composite negative electrode material as well as preparation and application thereof
  • Cobalt nickel selenide nitrogen-doped amorphous carbon nano composite negative electrode material as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0038] A cobalt-nickel-nitrogen-doped amorphous carbon nanocomposite negative electrode material, in which carbon is used as a skeleton, amorphous and doped with nitrogen, the particle size of the composite material is 80-150nm, and the entire material forms a porous structure. Prepared by the following steps:

[0039] Step 1. Ni / Co-ZIF-67 nanocubes were prepared using a simple liquid phase method. First, 2mmol (0.5821g) of Co(NO 3 ) 2 ·6H 2 O, 1mmol (0.2908g) of Ni(NO 3 ) 2 ·6H 2 O and 20mg cetyltrimethylammonium bromide (CTAB) are added in 25mL water to form an aqueous solution;

[0040] Step 2. Quickly pour the above solution into 175mL 2-methylimidazole aqueous solution (11.3g), then stir it at room temperature at a speed of 3000-5000r / min for 60min, and then let it stand at room temperature for 24h to obtain a suspension liquid;

[0041] Step 3: Vacuum filter the above suspension for 10-20 minutes to obtain a precipitate, which is washed three times with deionized...

Embodiment 2

[0049] A cobalt-nickel-nitrogen-doped amorphous carbon nanocomposite negative electrode material, in which carbon is used as a skeleton, amorphous and doped with nitrogen, the particle size of the composite material is 80-150nm, and the entire material forms a porous structure. Prepared by the following steps:

[0050] Step 1. NiCo-ZIF-67 nanocubes were prepared using a simple liquid-phase method. First, 2mmol (0.5821g) of Co(NO 3 ) 2 ·6H 2 O, 1mmol (0.2908g) of Ni(NO 3 ) 2 ·6H 2 O and 20mg cetyltrimethylammonium bromide (CTAB) are added in 25mL water to form an aqueous solution;

[0051] Step 2. Quickly pour the above solution into 175mL 2-methylimidazole aqueous solution (11.3g), then stir it at room temperature at a speed of 3000-5000r / min for 40min, and then let it stand at room temperature for 24h to obtain a suspension liquid;

[0052] Step 3: Vacuum filter the above suspension for 10-20 minutes to obtain a precipitate, wash the precipitate with deionized water a...

Embodiment 3

[0057] A cobalt-nickel-nitrogen-doped amorphous carbon nanocomposite negative electrode material, in which carbon is used as a skeleton, amorphous and doped with nitrogen, the particle size of the composite material is 80-150nm, and the entire material forms a porous structure. Prepared by the following steps:

[0058] Step 1. NiCo-ZIF-67 nanocubes were prepared using a simple liquid-phase method. First, 2mmol (0.5821g) of Co(NO 3 ) 2 ·6H 2 O, 1mmol (0.2908g) of Ni(NO 3 ) 2 ·6H 2 O and 20mg cetyltrimethylammonium bromide (CTAB) are added in 25mL water to form an aqueous solution;

[0059] Step 2. Quickly pour the above solution into 175mL 2-methylimidazole aqueous solution (11.3g), then stir it at room temperature at a speed of 3000-5000r / min for 40min, and then let it stand at room temperature for 12h to obtain a suspension liquid;

[0060] Step 3: Vacuum filter the above suspension for 10-20 minutes to obtain a precipitate, which is washed with deionized water and ab...

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Abstract

The invention relates to a cobalt-nickel selenide nitrogen-doped amorphous carbon nano composite negative electrode material as well as preparation and application thereof. The preparation method specifically comprises the following steps of (a) adding a cobalt source, a nickel source and hexadecyl trimethyl ammonium bromide into a 2-methylimidazole aqueous solution, stirring to form a mixed solution, standing and separating to obtain a precipitate, washing and drying to obtain NiCo-ZIF-67; and (b) selenizing the NiCo-ZIF-67 obtained in the step (a) by adopting elemental selenium, and then washing and drying to obtain the cobalt-nickel selenide nitrogen-doped amorphous carbon nano composite negative electrode material. The cobalt nickel selenide nitrogen-doped amorphous carbon nano composite negative electrode material is prepared into a sodium-ion battery negative electrode plate, and then the sodium-ion battery negative electrode plate, a metal sodium plate and an electrolyte are assembled into a sodium-ion battery. Compared with the prior art, the nano composite negative electrode material provided by the invention improves the electrochemical performance of the battery, has excellent electrochemical sodium storage performance, and is a good sodium ion battery negative electrode material.

Description

technical field [0001] The invention relates to the field of materials, in particular to a cobalt-nickel-nitrogen-doped amorphous carbon nanocomposite negative electrode material and its preparation and application. Background technique [0002] Li-ion batteries have attracted the interest of researchers as an important energy storage device in electrical devices, however, due to the limited resources of lithium, it is urgent to find alternatives to Li-ion batteries. Since both sodium and lithium belong to the same main group, have similar physical and chemical properties, and the storage of sodium is large and the price is much lower than that of lithium, sodium-ion batteries have been extensively studied in recent years. [0003] The properties of sodium-ion batteries mainly depend on the electrode materials. Limited by the larger radius of sodium ions (102pm), the kinetic characteristics of traditional electrode materials are not ideal. Therefore, in order to make sodium-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/58H01M10/054
CPCH01M4/364H01M4/525H01M4/58H01M10/054H01M2004/027Y02E60/10
Inventor 李兰杰赵家昌朱亚琴徐菁利
Owner SHANGHAI UNIV OF ENG SCI
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