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Covalent organic framework material, preparation method and application thereof

A covalent organic framework and suspension technology, which is applied in the preparation/purification of carbon, electrode manufacturing, electrical components, etc., can solve the problems of poor conductivity and large molecular weight, and achieve the effect of low synthesis equipment requirements and novel structure

Active Publication Date: 2020-07-24
QUJING NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor conductivity and high molecular weight of covalent organic polymer materials, there are still many difficulties in obtaining covalent organic framework electrode materials with large capacity, high rate performance, and high cycle stability.

Method used

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  • Covalent organic framework material, preparation method and application thereof
  • Covalent organic framework material, preparation method and application thereof
  • Covalent organic framework material, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Reflux cyclohexanone octahydrate (4g, 12.6mmol) and diaminomaleonitrile (10.88g, 100.8mmol) in AcOH (150mL) for 2h, filter the black suspension while hot, and wash with hot AcOH (3× 25mL) to give a black solid, which was suspended in 30% HNO 3 (60 mL) and heated at 100 °C for 3 h to obtain a hot dark brown suspension which was poured into ice water (200 mL) and cooled overnight, the suspension was filtered and the solid was dissolved in MeCN ( 400 mL) for 2 hours and filtered. The filtrate was evaporated in vacuo to give an orange solid (2.4 g, 50% yield) hexaazatribenzohexacarbonitrile (HAT-CN). COF-CN was prepared by carbonizing HAT-CN (500 mg) in a horizontal tube furnace under nitrogen flow for 1 h at different temperatures from room temperature to 80 °C, and the heating ramp was set at 2 °C min -1 , from 80°C to 700°C respectively set to 4°C·min -1, to prepare COF-CN, denoted as COF-CN700.

[0043] COF-CN700, PVDF, and KS6 were formulated into a mixture at a ma...

Embodiment 2

[0046] Reflux cyclohexanone octahydrate (4g, 12.6mmol) and diaminomaleonitrile (10.88g, 100.8mmol) in AcOH (150mL) for 2h, filter the black suspension while hot, and wash with hot AcOH (3× 25mL) to give a black solid, which was suspended in 30wt% HNO 3 (60 mL) and heated at 100 °C for 3 h to give a hot dark brown suspension which was poured into ice water (200 mL) and cooled overnight. The suspension was filtered and the solid was refluxed in MeCN (400 mL) for 2 hours and filtered, the filtrate was evaporated in vacuo to give an orange solid (2.4 g, 50% yield) hexaazatribenzohexacarbonitrile (HAT-CN). COF-CN was prepared by carbonizing HAT-CN (500 mg) at different temperatures for 1 hour under nitrogen flow in a horizontal tube furnace. The different temperatures are from room temperature to 80°C, and the heating ramp is set to 2°C min -1 , from 80°C to 900°C respectively set to 4°C·min -1 , the covalent organic framework material COF-CN was prepared, denoted as COF-CN900. ...

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Abstract

The invention discloses a covalent organic framework material, a preparation method and an application thereof. The preparation method comprises the following steps: refluxing hexaketocyclohexane octahydrate and diaminomaleonitrile; filtering out a black suspension while a solution is hot; washing by using hot AcOH; obtaining a black solid, and suspending the black solid in 30wt% HNO3; carrying out heating treatment to obtain a dark brown suspension; and pouring the hot dark brown suspension into ice water, filtering the suspension to obtain black solid HAT-CN, and carbonizing HAT-CN under protection of nitrogen or an inert gas to prepare the covalent organic framework material COF-CN. A first specific discharge capacity of the prepared electrode material reaches 1695mAh / g under current density of 0.01 V-3V and 100mA / g; and a discharge capacity is 708mAh / g after 50 cycles.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a covalent organic framework material, a preparation method and an application thereof. Background technique [0002] Traditional fossil energy is facing the problems of resource shortage and environmental pollution, and the development of new energy and new energy technology is imminent. Lithium-ion batteries are the most mature energy storage technology developed in the past decade, but it is still necessary to find better electrode materials to obtain greater storage capacity, higher energy density and longer cycle life. Carbon nanomaterials with sp2-hybridized frameworks possess many attractive properties, such as high electrical conductivity and abundant availability. These materials are widely used in the fields of absorption, catalysis, energy storage and conversion. Carbon has the smallest voxel size in chemical configuration, and its properties can be tun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/583H01M4/62H01M10/0525C01B32/05
CPCC01B32/05H01M4/0404H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 夏书标刘建军成飞翔
Owner QUJING NORMAL UNIV
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