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A kind of f-n-c composite material and its preparation method and application

A technology of F-N-C and composite materials, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of low cycle stability of lithium-sulfur batteries, achieve improved shuttle effect, improve electrochemical performance, and facilitate adsorption and mass transfer Effect

Active Publication Date: 2020-12-08
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the defect of low cycle stability of lithium-sulfur batteries in the prior art, the present invention provides a F-N-C composite material with uniform dispersion of heteroatoms, large specific surface area and high porosity, its preparation method and its use in lithium-sulfur battery separators. application

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  • A kind of f-n-c composite material and its preparation method and application
  • A kind of f-n-c composite material and its preparation method and application
  • A kind of f-n-c composite material and its preparation method and application

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Embodiment 1

[0032] Dissolve 1.37g of zinc nitrate hexahydrate in 80mL of methanol to obtain solution A; dissolve 3.7g of 2-methylimidazole in 80mL of methanol to obtain solution B; mix solution A and solution B, stir at room temperature for 24h, wash and dry to obtain Metal-organic framework precursors. The metal-organic framework material precursor was placed in a high-temperature tube furnace, and under the protection of nitrogen, the temperature was raised to 800 °C at a rate of 5 °C / min and kept for 1 h to obtain a nitrogen-doped porous carbon material. Then the obtained nitrogen-doped porous carbon material is placed in a reactor, and an ammonium bifluoride solution is added, wherein the mass ratio of the nitrogen-doped porous carbon material to the ammonium bifluoride in the ammonium bifluoride solution is 1:1; the reactor is placed React in an oven at 150°C for 15 hours. After the reaction, wash with deionized water and dry to obtain a porous carbon material F-N-C composite materia...

Embodiment 2

[0036]Dissolve 0.48g of zinc nitrate hexahydrate in 80mL of methanol to obtain solution A; dissolve 1.31g of 2-methylimidazole in 80mL of ethanol to obtain solution B; mix solution A and solution B, stir at room temperature for 24h, wash and dry to obtain Metal-organic framework precursors. The metal-organic framework material precursor was placed in a high-temperature tube furnace, and under the protection of nitrogen, the temperature was raised to 900°C at a rate of 5°C / min and kept for 2h to obtain a nitrogen-doped porous carbon material. Then the obtained nitrogen-doped porous carbon material is placed in a reactor, and an ammonium bifluoride solution is added, wherein the mass ratio of the nitrogen-doped porous carbon material to the ammonium bifluoride in the ammonium bifluoride solution is 0.5:2; React in an oven at 100°C for 16 hours. After the reaction, wash with deionized water and dry to obtain a porous carbon material F-N-C composite material co-doped with fluorine...

Embodiment 3

[0040] Dissolve 2.38g of zinc nitrate hexahydrate in 80mL of N,N-dimethylformamide to obtain solution A; dissolve 5.9g of 2-methylimidazole in 80mL of N,N-dimethylformamide to obtain solution B; Mix solution A and solution B, stir at room temperature for 24 hours, wash and dry to obtain a metal organic framework material precursor. The metal-organic framework material precursor was placed in a high-temperature tube furnace, and under the protection of nitrogen, the temperature was raised to 1000°C at a rate of 8°C / min and kept for 3h to obtain a nitrogen-doped porous carbon material. Then the obtained nitrogen-doped porous carbon material is placed in the reactor, and ammonium bifluoride solution is added, wherein the mass ratio of the nitrogen-doped porous carbon material to the ammonium bifluoride in the ammonium bifluoride solution is 1:2; the reactor is placed in React in an oven at 200°C for 12 hours, wash with deionized water after the reaction, and dry to obtain a porou...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to an F-N-C composite material, a preparation method thereof, and an application in lithium-sulfur battery separators. The F-N-C composite material is a porous carbon material co-doped with fluorine atoms and nitrogen atoms, and its fluorine atoms and nitrogen atoms are dispersed on the surface and inside of the porous carbon material; it is formed by reacting a soluble zinc salt and an imidazole ligand The precursor of the metal organic framework material is calcined and fluorinated to obtain the F-N-C composite material; the F-N-C composite material, conductive agent and binder are dispersed in an organic solvent, ground, and then coated Coated on the surface of the lithium-sulfur battery diaphragm, the lithium-sulfur battery modified diaphragm is obtained. The present invention adopts heteroatom co-doping, utilizes the characteristics of high electronegativity of nitrogen and fluorine, can induce the charge redistribution of adjacent atoms in the carbon material, improves the electrochemical performance of the carbon material, and is used for the modification of lithium-sulfur batteries The diaphragm can improve the capacity and cycle stability of lithium-sulfur batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to an F-N-C composite material, a preparation method thereof and an application in lithium-sulfur battery separators. Background technique [0002] With the rapid development of industry and the rapid growth of population, energy crisis and environmental pollution have become the main problems faced by human beings, restricting the development of human society. Therefore, people's requirements for new energy and green technology are becoming more and more urgent. High specific capacity, good safety and stability, and environment-friendly new lithium-ion batteries can well meet people's requirements for energy and the environment. At present, traditional lithium-ion battery cathode materials, such as LiMn 2 o 4 , LiFePO 4 Due to the limitation of its theoretical specific capacity, it is difficult to make a breakthrough in a short period of time, while...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/364H01M4/62H01M4/625H01M4/626Y02E60/10
Inventor 房新佐江钰张开龙欧军飞王法军
Owner JIANGSU UNIV OF TECH
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