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Embedded cobalt sulfide and porous carbon nanorod composite electrode material and preparation method and application thereof

A composite electrode and cobalt sulfide technology, which is applied in the field of nanomaterials and electrochemistry, to achieve the effect of improving the rate performance, improving the utilization rate of materials, and being easy to implement

Inactive Publication Date: 2017-03-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far, there has been no report on the preparation and electrochemical performance of the composite electrode material of embedded cobalt sulfide and porous carbon nanorods.

Method used

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  • Embedded cobalt sulfide and porous carbon nanorod composite electrode material and preparation method and application thereof
  • Embedded cobalt sulfide and porous carbon nanorod composite electrode material and preparation method and application thereof
  • Embedded cobalt sulfide and porous carbon nanorod composite electrode material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Dissolve 4mmol cobalt nitrate hexahydrate in 60mL DMF, add 4mmol trimesic acid, 2mmol 4,4'-bipyridyl, stir well until completely dissolved, then transfer to high temperature and high pressure reactor, heat at 120°C for 4h, cool After reaching room temperature, a solution containing cobalt metal-organic framework (Co-MOF) was obtained, filtered and washed, and vacuum-dried at 60° C. for 12 h. The sample was ground and mixed with sublimed sulfur at a ratio of 1:0.8, and calcined in a tube furnace at 700 °C for 2 h under a vacuum atmosphere to obtain the target product.

[0030] Taking the embedded cobalt sulfide and porous carbon nanorod composite (7-CoS / C), the product of this example, as an example, its structure is confirmed by X-ray diffraction (XRD) pattern. Such as figure 1 The XRD pattern shows that the embedded cobalt sulfide and porous carbon nanorod composite is pure phase cobalt sulfide (JCPDS card number is 65-8977). Such as figure 2 As shown in the TEM im...

Embodiment 2

[0034]Dissolve 4mmol cobalt nitrate hexahydrate in 60mL DMF, add 4mmol trimesic acid, 2mmol 4,4'-bipyridyl, stir well until completely dissolved, then transfer to high temperature and high pressure reactor, heat at 120°C for 4h, cool After reaching room temperature, a solution containing cobalt metal-organic framework (Co-MOF) was obtained, filtered and washed, and vacuum-dried at 60° C. for 12 h. The sample was ground and mixed with sublimed sulfur at a ratio of 1:0.8, and calcined in a tube furnace at 800 °C for 2 h under a vacuum atmosphere to obtain the target product.

[0035] Taking the embedded cobalt sulfide and porous carbon nanorod composite (18.5-CoS / C), which is the product of this example, as an example, its structure is determined by X-ray diffraction (XRD) patterns. Such as figure 1 The XRD pattern shows that the embedded cobalt sulfide and porous carbon nanorod composite is pure phase cobalt sulfide (JCPDS card number is 65-8977). However, its half peak width...

Embodiment 3

[0038] Dissolve 4mmol cobalt perchlorate in 60mL DMF, add 4mmol trimesic acid, 2mmol 4,4'-bipyridyl, stir well until completely dissolved, then transfer to high temperature and high pressure reactor, heat at 120°C for 4h, cool After reaching room temperature, a solution containing cobalt metal-organic framework (Co-MOF) was obtained, filtered and washed, and vacuum-dried at 60° C. for 12 h. The sample was ground and mixed with sublimed sulfur at a ratio of 1:1.2, and calcined in a tube furnace at 700 °C for 2 h under a vacuum atmosphere to obtain the target product.

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Abstract

The invention relates to an embedded cobalt sulfide and porous carbon nanorod compound and a preparation method thereof. Cobalt sulfide nanoparticles are embedded in a porous carbon nanorod, the porous carbon nanorod is of a one-dimensional porous rod-like structure, the sizes of the cobalt sulfide nanoparticles are 5 to 10 nm, the length of the porous carbon nanorod is 2 microns, and the diameter of the porous carbon nanorod is 200 nm. The preparation method comprises the following steps: 1) dissolving a cobalt salt soluble in organic solvents into an organic solvent, adding a ligand, and stirring to form a transparent solution; 2) transferring into a high-temperature high-pressure reaction still, heating for reacting, and cooling to obtain a solution containing a cobalt metal organic skeleton compound; 3) carrying out filtering, washing and vacuum drying treatment on the solution in sequence so as to obtain Co-MOF powder; and 4) carrying out grinding and mixing on the powder and sublimed sulfur in a certain proportion, and calcining to obtain a target product. The compound has the advantages that the rate capability of the material is improved, and the compound still can show relatively high specific capacity and good cycle performance under large current density.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, and in particular relates to a composite of embedded cobalt sulfide and porous carbon nanorods and a preparation method thereof. The material can be used as a high-rate and long-life sodium-ion battery negative electrode material. Background technique [0002] In recent years, lithium-ion batteries have been widely used in digital products, medical and health care, electrochemical energy storage and other fields. However, the content of lithium resources in the earth's crust does not exceed 20ppm and is mainly distributed in South America, which is difficult to meet the increasing needs of human beings. Compared with lithium, the distribution of sodium resources is more extensive, and the cost of sodium salt is lower, which is conducive to sustainable development and environmental friendliness. Therefore, Na-ion batteries are considered to be one of the most promising ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/054
CPCH01M4/362H01M4/5815H01M4/587H01M10/054Y02E60/10
Inventor 安琴友周丽敏麦立强刘琦
Owner WUHAN UNIV OF TECH
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