Method for preparing lithium-sulfur battery diaphragm material by using fluorine-containing covalent organic framework material

A covalent organic framework, lithium-sulfur battery technology, used in lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve problems such as low capture strength and efficiency, imperfect related mechanisms, and inappropriate pore size , to achieve the effect of simple synthesis, inhibition of shuttle effect, and excellent discharge specific capacity

Pending Publication Date: 2022-07-22
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many challenges in the practical research of materials
For example: (1) The specific surface area is small and the pore size

Method used

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  • Method for preparing lithium-sulfur battery diaphragm material by using fluorine-containing covalent organic framework material
  • Method for preparing lithium-sulfur battery diaphragm material by using fluorine-containing covalent organic framework material
  • Method for preparing lithium-sulfur battery diaphragm material by using fluorine-containing covalent organic framework material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Fluorine-containing covalent organic framework material (COF-F): 200 mg (0.55 mmol) of 2, 4, 6 tris(4-aminophenyl)-1, 3, 5-triazine and 250 mg of 1,3,5-tris( 3-Fluoro-4-formylphenyl)benzene (0.55mmol) was added to a 50ml thick-walled pressure bottle, 50ml 1,4-dioxane, 50ml o-chlorobenzene and 10ml glacial acetic acid were added after sonication , seal the pressure bottle, sonicate for 5-10 minutes, and quickly freeze it in a liquid nitrogen bath for 2-5 minutes; then vacuum the pressure bottle, fill it with argon, seal it, and thaw it to room temperature. After 3 cycles of "freezing" - Thaw" process, i.e. degassing through three pump freeze-thaw cycles. Then, the temperature was raised to 120°C at a heating rate of 5°C / min for 3 days, and the product was obtained by centrifugation, and washed three times with acetone and tetrahydrofuran alternately. Finally, the product COF-F was dried under vacuum at 80 °C for 8 hours to obtain the covalent organic framework material ...

Embodiment 2

[0051] Fluorine-free covalent organic framework material (COF-NF): add 2,4,6-tris(4-aminophenyl)triazine (53.2mg, 0.15mmol), 1,3 to a 15ml thick-walled pressure bottle , 5-tris(4-formylphenyl)benzene (58.6 mg, 0.15 mmol), 2 mLo-DCB, 2 mL n-butanol and 0.4 mL 6M aqueous acetic acid. The thick-walled pressure bottle was first sonicated for 30 minutes to form a bulk solid, then flash frozen at 77k (in a liquid nitrogen atmosphere) and degassed through three pump freeze-thaw cycles. The tube was sealed, and then the temperature was raised to 120°C at a ramp rate of 5°C / min and the reaction was incubated for 3 days. The bright yellow precipitate was washed three times with acetone and collected by filtration. Finally, the powder was dried in a vacuum oven at 80°C.

Embodiment 3

[0053] The other steps are the same as in Example 1, except that the constant temperature reaction time is replaced by 5 days from 3 days. , when the replacement is 5 days, the COF-F material can still be synthesized but the structure is unstable and the crystallinity is low.

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Abstract

The invention discloses a method for preparing a lithium-sulfur battery diaphragm material from a fluorine-containing covalent organic framework material, and belongs to the technical field of energy materials. A novel COF material (COF-F) rich in fluorine atoms serves as a modified diaphragm material of a lithium-sulfur battery, diaphragm modification has the shuttle effect influence on the lithium-sulfur battery and the anchoring effect on polysulfide, and the novel COF material is successfully prepared in a gradual heating mode and has high crystallinity. And when being used as a modified diaphragm material of the lithium-sulfur battery, the modified diaphragm material can reinforce anchoring of polysulfide and aims at improving the electrochemical performance of the lithium-sulfur battery. And compared with the same COF structure without fluorine, the characteristics of the material are highlighted. The material has triazinyl and fluorine functional groups, so that the chemical bond action on polysulfide can be enhanced, and the cycle performance of the lithium-sulfur battery can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to a method for preparing a lithium-sulfur battery separator material by a fluorine-containing covalent organic framework material, and a lithium-sulfur battery with the separator. Background technique [0002] Covalent organic frameworks (COFs) are a class of crystalline porous organic materials, linked by covalent bonds, with ordered pore sizes and controllable structures. COFs have high potential in gas storage and separation, optoelectronic materials, catalytic applications, and other fields. In recent years, the development of COFs materials in the field of energy storage technologies such as batteries and supercapacitors has become one of the strategic measures to solve the energy shortage problem around the world. Among these electrochemical energy storage systems, lithium-sulfur (Li-S) batteries are widely used due to their high energy density and envir...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/411H01M10/052
CPCH01M50/403H01M50/411H01M10/052
Inventor 于海洲李明明
Owner NANJING UNIV OF TECH
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