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F-N-C composite material and preparation method and application thereof

A F-N-C, composite material technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problem of low cycle stability of lithium-sulfur batteries, and achieve improved shuttle effect, specific capacity and cycle stability, and high porosity. Effect

Active Publication Date: 2019-08-02
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

Method used

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  • F-N-C composite material and preparation method and application thereof
  • F-N-C composite material and preparation method and application thereof
  • F-N-C composite material and preparation method and application thereof

Examples

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Effect test

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 a lithium-sulfur battery and particularly relates to an F-N-C composite material and a preparation method and an application thereof. The F-N-C composite material is a porous carbon material co-doped with fluorine atoms and nitrogen atoms, and the fluorine atoms and the nitrogen atoms are dispersed on the surface of and inside the porous carbon material; metal-organic framework material precursor is formed through reaction of soluble zinc salt with imidazolates, after calcination and fluorination treatment, the F-N-C composite material is obtained; the F-N-C composite material, conductive agent and binder are dispersed in organic solvent, ground and coated on a surface of a lithium sulfur battery diaphragm, namely, the lithium-sulfur batterymodified diaphragm. The method is advantaged in that the multiple types of atoms are utilized for co-doping, high electronegativity of nitrogen and fluorine is utilized, redistribution of charges in the adjacent atoms in the carbon material can be induced, electrochemical performance of a carbon material is improved, the method is for the lithium-sulfur battery modified diaphragm, and capacitanceand cycle stability of the lithium-sulfur battery can be improved.

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 Applications(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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