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Covalent organic framework material, preparation method thereof and application of covalent organic framework material in lithium ion battery

A covalent organic framework, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as inability to meet practical applications, rate performance limitations, low conductivity, etc.

Pending Publication Date: 2021-08-13
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the inherent low conductivity of organic materials, small molecules and polymers are used as electrode materials for lithium-ion batteries, and their rate performance is limited to a certain extent, which cannot meet practical applications.

Method used

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  • Covalent organic framework material, preparation method thereof and application of covalent organic framework material in lithium ion battery
  • Covalent organic framework material, preparation method thereof and application of covalent organic framework material in lithium ion battery
  • Covalent organic framework material, preparation method thereof and application of covalent organic framework material in lithium ion battery

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preparation example Construction

[0068] In a specific embodiment, the preparation method further includes a step of extracting the reactants after the reaction of 3,5,6-tetraamino-1,4-benzoquinone and cyclohexanone or its hydrate is completed. For example, to extract the reactants, Soxhlet extraction can be used. For example, after the reaction is completed, the resulting mixture can be cooled to room temperature, and then methanol is added to precipitate a solid, which is collected by filtration, extracted by Soxhlet, and dried in vacuum to obtain the final product.

[0069] In a particularly specific embodiment, the covalent organic framework material is prepared by adding 2,3,5,6-tetraamino-1,4-benzoquinone and cyclohexanone octahydrate to three ports under the protection of argon Place in an ice bath, then slowly add a solvent and a small amount of catalyst, then return to room temperature for reaction, then change the ice bath to an oil bath, heat the reaction, then cool to room temperature, add methanol...

Embodiment 1

[0085] Synthesis of Example 1 Covalent Organic Framework Material 1

[0086] Under argon protection, 504 mg (3 mmol) of 2,3,5,6-tetraamino-1,4-benzoquinone (according to Z.Luo, L.Liu, J.Ning, K.Lei, Y.Lu , F.Li and J.Chen, A Microporous Covalent-Organic Frameworkwith Abundant Accessible Carbonyl Groups for Lithium-Ion Batteries, synthesized by the method described in Angew.Chem.Int.Ed.57(2018) 9443-9446.) and 624mg ( 2mmol) cyclohexanone octahydrate (purchased from Aladdin Reagent Company) was added in a 50ml there-necked flask, placed in an ice bath, slowly added 15ml N-methylpyrrolidone and a few drops of sulfuric acid, then returned to room temperature, and reacted After 3 hours, change to an oil bath, raise the temperature to 65°C, and react overnight for 24 hours. Then the reaction flask was cooled to room temperature, methanol was added, and the solid precipitate was collected by filtration, further extracted with water, ethanol, and acetone by Soxhlet, and vacuum-dried...

Embodiment 2

[0087] Synthesis of Example 2 Covalent Organic Framework Material 2

[0088] Under argon protection, 504mg (3mmol) of 2,3,5,6-tetraamino-1,4-benzoquinone and 624mg (2mmol) of cyclohexanone octahydrate were added to a 50ml three-necked flask, In an ice bath, slowly add 15ml of N-methylpyrrolidone and a few drops of sulfuric acid, then return to room temperature, react for 3h, then change to an oil bath, heat to 65°C, and react overnight for 12h. Then the reaction flask was cooled to room temperature, methanol was added, and the solid precipitate was collected by filtration, further extracted with water, ethanol, and acetone by Soxhlet, and vacuum-dried at 80° C. for 12 hours to obtain product 2 as a black solid.

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Abstract

The invention provides a novel covalent organic framework material, which is obtained by reaction of 2,3,5,6-tetraamino-1,4-benzoquinone and cyclohexanehexone or a hydrate thereof. The invention also provides a corresponding preparation method. The invention further provides application of the covalent organic framework material in a lithium ion battery, especially as a positive electrode material. The covalent organic framework material is in a two-dimensional lamellar shape, and has a large number of conjugated carbonyl groups and carbon-nitrogen double bonds with electrochemical activity, so that the lithium ion battery prepared from the covalent organic framework material has relatively high energy density.

Description

technical field [0001] The present invention generally relates to the field of organic electrode materials for lithium-ion batteries, in particular to a new (two-dimensional) covalent organic framework and its preparation method, and the use of the covalent organic framework in lithium-ion batteries, especially as positive electrode materials use. Background technique [0002] Covalent organic framework materials ( C oval O organic F framework, COF) is a class of organic porous polymers with periodicity and crystallinity, and the structural units are constructed through covalent bonds. In 2005, Yaghi's research group successfully synthesized borate-based two-dimensional covalent organic framework materials for the first time, and has since entered the rapid research and development stage of covalent organic framework materials. Compared with other porous crystalline materials, the covalent organic framework can precisely design and regulate its skeleton and pores at the ...

Claims

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Application Information

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IPC IPC(8): C08G73/06H01M10/0525H01M4/60
CPCC08G73/0694H01M10/0525H01M4/602Y02E60/10
Inventor 陈永胜吴蔓蔓赵阳李晨曦
Owner NANKAI UNIV
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