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Heteroatom doped carbon/CoS2 functional material derived based on metal organic framework and application thereof

A technology of metal-organic frameworks and functional materials, applied in electrochemical generators, secondary battery repair/maintenance, electrical components, etc., can solve the problem of unfavorable solid electrolyte stable formation, hindering the widespread application of lithium-sulfur batteries, and deteriorating lithium dendrite growth and other problems, to achieve the effects of suppressing the shuttle effect, improving performance, and improving cycle and rate performance

Pending Publication Date: 2020-06-19
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, this reaction will cause corrosion on the surface of metal lithium, which is not conducive to the stable formation of solid electrolyte (SEI) film, and will deteriorate the growth of lithium dendrites, increasing the possibility of them piercing the separator, posing a threat to the safety of the battery.
These problems have hindered the widespread application of lithium-sulfur batteries

Method used

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  • Heteroatom doped carbon/CoS2 functional material derived based on metal organic framework and application thereof
  • Heteroatom doped carbon/CoS2 functional material derived based on metal organic framework and application thereof
  • Heteroatom doped carbon/CoS2 functional material derived based on metal organic framework and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1. Preparation of ZIF8 / ZIF67 composite structure

[0046] Take zinc nitrate hexahydrate and dimethylimidazole with a mass ratio of 1:1 and dissolve them in 100 ml of methanol solution respectively to form liquids A and B. Slowly add liquid B to liquid A, keep stirring for 24 hours, and then 60 Vacuum drying at ℃ for 12 hours to obtain ZIF8; take a certain amount of ZIF8 and disperse it in 100 ml of methanol, add cobalt nitrate hexahydrate and dimethylimidazole at a mass ratio of 1:1, and the mass ratio of ZIF8 and cobalt nitrate hexahydrate is 1:7, The reaction was kept under stirring for 24 h at room temperature, and then vacuum-dried at 60° C. for 12 h to obtain a ZIF8 / ZIF67 composite structure.

[0047] 2. Preparation of CoS 2 / C-1 structure

[0048] Put the product ZIF8 / ZIF67 in a crucible, then place it in a tube furnace, heat it to 700°C and keep it for 4h, the heating rate is 4°C / min, and the carbonized product is obtained after natural cooling; Weigh the mass ...

Embodiment 2

[0054] 1. Preparation of ZIF8 / ZIF67 structure

[0055] Take zinc nitrate hexahydrate and dimethylimidazole with a mass ratio of 1:1 and dissolve them in 100 ml of methanol solution respectively to form liquids A and B. Slowly add liquid B to liquid A, keep stirring for 24 hours, and then 60 Vacuum drying at ℃ for 12 hours to obtain ZIF8; take a certain amount of ZIF8 and disperse it in 100 ml of methanol, add cobalt nitrate hexahydrate and dimethylimidazole at a mass ratio of 1:1, and the mass ratio of ZIF8 and cobalt nitrate hexahydrate is 1:10, The reaction was kept stirring at room temperature for 24 h, and then vacuum-dried at 60° C. for 12 h to obtain ZIF8 / ZIF67.

[0056] 2. Preparation of CoS 2 / C-1 structure

[0057] The product ZIF8 / ZIF67 was placed in a crucible, then placed in a tube furnace, heated to 900°C and kept for 2 hours, and the carbonized product was obtained after natural cooling; the carbonized product and sublimed sulfur with a mass ratio of 1:10 were ...

Embodiment 3

[0063] 1. Preparation of LDH / ZIF67

[0064] Dissolve cobalt chloride hexahydrate, aluminum chloride hexahydrate and urea with a mass ratio of 2:1:1.5 in 500 mL of deionized water, raise the temperature to 90°C, keep stirring for 12 hours, collect the product by centrifugation, and dry it in vacuum at 80°C for 6 hours. Obtain LDH; take a certain amount of LDH (mass ratio LDH: cobalt nitrate hexahydrate = 1:6) and disperse it in 100mL of methanol, add cobalt nitrate hexahydrate and dimethylimidazole with a mass ratio of 2:1, and keep stirring at room temperature 0.5-4h, the reaction product was dried at 80°C for 8h to obtain LDH / ZIF67.

[0065] 2. CoS 2 Preparation of / C-2

[0066] Put the product LDH / ZIF67 obtained in step 1 in a porcelain boat, then place it in a tube furnace, program the temperature to 900°C and keep it for 2 hours, the heating rate is 5°C / min, and obtain the carbonized product after natural cooling; the mass ratio is weighed as The 6:1 sublimated sulfur a...

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Abstract

The invention discloses a heteroatom doped carbon / CoS2 functional material derived based on a metal organic framework and application of the heteroatom doped carbon / CoS2 functional material. The heteroatom doped carbon / CoS2 functional material is a porous CoS2 / C functional material obtained by performing high-temperature carbonization and gas-phase vulcanization treatment on a designed and synthesized metal organic framework composite structure. The heteroatom doped carbon / CoS2 functional material disclosed by the invention has an excellent chemical adsorption effect on polysulfide, i.e., a Keesom force effect of heteroatom doped carbon and a Lewis acid-base effect of CoS2. Besides, the porous carbon structure also has physical barrier and adsorption effects, and the conductive carbon canalso promote the reaction kinetics, activate dead sulfur and dead lithium and reduce the loss of active substances, thereby improving the performance of the battery.

Description

technical field [0001] The present invention relates to a heteroatom-doped carbon / CoS derived from a metal-organic framework 2 Functional materials and their applications. Background technique [0002] The rapid progress of modern technology has led to a great increase in people's dependence on energy. Traditional fossil energy sources are increasingly depleted and have caused serious environmental pollution. Therefore, it is imminent to develop and utilize new and environmentally friendly energy sources. However, clean energy such as wind energy, water energy, and geothermal energy are unevenly distributed in time and space, and the power resources produced cannot be directly connected to the grid for use. This has led to the development of such clean energy not achieving the expected results. In order to realize the full utilization and popularization of such clean energy, it is very important to adopt effective electric energy storage methods. The electrochemical ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M2/16H01M10/052
CPCH01M10/4235H01M10/052H01M50/411Y02E60/10
Inventor 胡源汪俊岭阚永春宋磊
Owner UNIV OF SCI & TECH OF CHINA
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