S@NPC/CNT composite material and preparation method and application thereof

A composite material and carbon material technology, applied in the field of S@NPC/CNT composite material and its preparation, can solve the problems of loss, low sulfur content, polysulfide dissolution capacity, etc., to improve electrical conductivity, enhance electrical conductivity, reduce The effect of the small shuttle effect

Inactive Publication Date: 2019-04-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problems of low sulfur content, polysulfide dissolution and capacity loss in the cathode materials of existing lithium-sulfur batteries, the first purpose of the present invention is to provide a S@NPC / CNT composite with high specific surface area and high sulfur loading. Material

Method used

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  • S@NPC/CNT composite material and preparation method and application thereof
  • S@NPC/CNT composite material and preparation method and application thereof
  • S@NPC/CNT composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Preparation of S@NPC / CNT composite material and performance test of its assembled lithium-sulfur battery

[0067] Step (1): Preparation of Zn / Co-bimetallic ZIFs / / CNT composites

[0068] Put 1.68mmol of zinc nitrate and 1.71mmol of cobalt nitrate into a mixed solution of methanol and water with a volume ratio of 3:1, put them on a magnetic stirrer and dissolve them by stirring to form a uniform pink solution. Then add 6.09mmol of 2-methylimidazole and 50mg of carbon nanotubes (particle size is 20-40nm) to the above solution, after stirring for 6h, the solution is filtered, washed with methanol, and finally placed in a drying oven at 70°C After drying overnight, the ZnCo-ZIFs / CNTs material was obtained.

[0069] Step (2): Preparation of NPC / CNT material

[0070] After fully grinding the ZnCo-ZIFs / CNTs composite material prepared in step (1), put it into a porcelain boat, and keep it at 900°C for 3h at a heating rate of 5°C / min in a nitrogen atmosphere. After naturally ...

Embodiment 2

[0079] Preparation of S@NPC / CNT composite material and performance test of its assembled lithium-sulfur battery

[0080] Step (1): Preparation of Zn / Co-bimetallic ZIFs / / CNT composites

[0081] Put 1.68mmol of zinc nitrate and 1.71mmol of cobalt nitrate into a mixed solution of methanol and water with a volume ratio of 3:1, put them on a magnetic stirrer and dissolve them by stirring to form a uniform pink solution. Then, 5.08 mmol of 2-methylimidazole and 40 mg of carbon nanotubes were added to the above solution, and after stirring for 6 hours, the solution was filtered, washed with methanol, and finally placed in a drying oven at 70°C to dry overnight to obtain ZnCo-ZIFs / CNTs Material.

[0082] Step (2): Preparation of NPC / CNT material

[0083] After fully grinding the ZnCo-ZIFs / CNTs composite material prepared in step (1), put it into a porcelain boat, and keep it at 900°C for 3h in a nitrogen atmosphere at a heating rate of 5°C / min. After naturally cooling to room tempe...

Embodiment 3

[0091] Preparation of S@NPC / CNT composite material and performance test of its assembled lithium-sulfur battery

[0092] Step (1): Preparation of Zn / Co-bimetallic ZIFs / / CNT composites

[0093] Put 1.68mmol of zinc nitrate and 1.71mmol of cobalt nitrate into a mixed solution of methanol and water with a volume ratio of 3:1, put them on a magnetic stirrer and dissolve them by stirring to form a uniform pink solution. Then, 7.24 mmol of 2-methylimidazole and 60 mg of carbon nanotubes were added to the above solution, and after stirring for 6 hours, the solution was filtered, washed with methanol, and finally dried overnight at 70°C in a drying oven to obtain ZnCo-ZIFs / CNT Material.

[0094] Step (2): Preparation of NPC / CNT material

[0095] After fully grinding the ZnCo-ZIFs / CNT composite material prepared in step (1), put it into a porcelain boat, and keep it at 900°C for 3h in a nitrogen atmosphere at a heating rate of 5°C / min. After naturally cooling to room temperature, th...

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Abstract

The invention discloses an S@NPC/CNT composite material and a preparation method and application thereof. The S@NPC/CNT composite material is obtained from an NPC/CNT composite material by sulfur loading. The NPC/CNT composite material is composed of nitrogen doped porous carbon and carbon nanotubes in the interweaving mode. The nitrogen doped porous carbon is a carbon material derived from a Zn/Co-bimetallic organic framework. The nitrogen doped carbon material is obtained by stirring, drying, calcining and acid treatment of a methyl alcohol and water mixed solution containing zinc and/or cobalt transition metal salt, organic ligand and a carbon material, and finally the high sulfur loaded S@NPC/CNT composite material is prepared by a melt diffusion method. The material exhibits extremelyhigh sulfur content. In addition, the invention also discloses the application of the high sulfur loaded nitrogen doped carbon material prepared by the method in a lithium sulfur battery. The composite material is used for an anode material of the lithium sulfur battery. The obtained battery has high area capacity and good electrochemical performance. The efficient method for preparing the nitrogen doped carbon material with high performance and high sulfur content is provided.

Description

technical field [0001] The invention belongs to the field of preparation of energy storage materials; in particular, it relates to a S@NPC / CNT composite material and its preparation method and application. Background technique [0002] With the development of electric vehicles and portable electronic devices, lithium-sulfur batteries have attracted widespread attention due to their high theoretical specific capacity (1675 mA h / g) and high theoretical energy density (~2 600 W h / kg). , It is very likely to become a commonly used power supply device in the future. Lithium-sulfur batteries are considered to be one of the most promising next-generation high-energy-density battery technologies due to their wide source of raw materials, low cost, high theoretical capacity, and environmental friendliness. However, there are still many problems in the commercial application of lithium-sulfur batteries. There are three main problems: [0003] (1) The low conductivity of sulfur redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38
CPCH01M4/364H01M4/38Y02E60/10
Inventor 刘又年许颖马路张梦源李亚娟
Owner CENT SOUTH UNIV
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