Covalent organic framework material rich in zwitterions as well as preparation method and application of covalent organic framework material

A covalent organic framework and zwitterion technology, applied in the application of lithium-sulfur battery cathode materials, the field of preparation of covalent organic framework, can solve the problems of large specific surface area, high thermal stability, lack of research, etc., to achieve low density, High thermal stability, effect of promoting catalytic conversion

Pending Publication Date: 2022-04-15
HEBEI UNIV OF TECH
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  • Application Information

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Problems solved by technology

Due to the special structural properties of this material, such as low density, high thermal stability, and large specific surface area, this material has been widely used in the fields of gas adsorption, catalysis, energy storage, and photoelectric conversion. Covalent organic framework materials, research in related fields is still very scarce

Method used

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  • Covalent organic framework material rich in zwitterions as well as preparation method and application of covalent organic framework material
  • Covalent organic framework material rich in zwitterions as well as preparation method and application of covalent organic framework material
  • Covalent organic framework material rich in zwitterions as well as preparation method and application of covalent organic framework material

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Experimental program
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Effect test

Embodiment 1

[0035](1) Preparation of zwitterionic covalent organic framework materials: put 81.1mg (ie 0.5mmol) of trimesaldehyde and 214mg (0.75mmol) of 3,8-diamino-6-phenylphenanthridine in a 25ml thick-walled pressure bottle In the medium, vacuumize, fill with argon, add 1,4-dioxane (3.125ml), mesitylene (3.125ml) and acetic acid aqueous solution (1.25ml, 6mol / L), ultrasonic 5min to make it fully dispersed, After performing three cycles of liquid nitrogen freezing (each cycle includes a "freezing-thawing" step, the freezing is freezing at liquid nitrogen -196°C for 5 minutes, and thawing is standing for 15 minutes under natural conditions to return to room temperature), Filled with argon, heated to 120°C in an oil bath, reacted at constant temperature for 3 days, cooled, filtered, the solid was repeatedly washed with 1,4-dioxane, and dried in vacuum at 60°C for 12 hours to obtain a covalent organic framework COF.

[0036] (2) Add 0.05g of the above-mentioned COF, 0.1g of propane sulton...

Embodiment 2

[0047] Other steps are the same as in Example 1, except that the constant temperature reaction time is replaced by 5 days by 3 days.

Embodiment 3

[0049] Other steps are the same as in Example 1, except that 150 mg of sublimed sulfur powder is replaced by 175 mg.

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Abstract

The invention relates to a zwitter-ion-rich covalent organic framework material as well as a preparation method and application thereof. The covalent organic framework material is prepared by taking 3, 8-diamino-6-phenyl phenanthridine and benzenetricarboxaldehyde as raw materials and introducing sulfo groups through a post-modification method. According to the invention, sulfo groups are introduced to a COF skeleton, so that the COF skeleton has positive and negative charges; wherein positively charged nitrogen atoms and negatively charged sulfo groups not only can inhibit the loss of an active substance sulfur in the lithium-sulfur battery, but also can promote the catalytic conversion of polysulfide, so that the cycle performance of the lithium-sulfur battery can be remarkably improved.

Description

technical field [0001] The invention belongs to the field of preparation of positive electrode composite materials for lithium-sulfur batteries, and in particular relates to a preparation method of a covalent organic framework rich in zwitterions and its application in lithium-sulfur battery positive electrode materials. Background technique [0002] The continuous development of electronic products and new energy electric vehicles has higher and higher requirements for energy storage equipment. However, due to the limited energy density of traditional lithium-ion batteries, it is difficult to meet the demand. Therefore, it is necessary to develop batteries with high energy density. Due to the high theoretical specific capacity (1675mAh g -1 ) and energy density (2600Wh kg -1 ) has attracted the attention of researchers and is a very promising candidate. [0003] Lithium-sulfur battery is a kind of lithium battery, which uses sulfur as the positive electrode of the battery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/26H01M4/04H01M4/62H01M10/052
CPCH01M4/628H01M4/62H01M4/0404H01M4/0471C08G12/26H01M10/052
Inventor 杨延琴韩禄李明凯孙树政古国贤岳俊博
Owner HEBEI UNIV OF TECH
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