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Selenium-doped covalent organic framework-sulfur cathode composite material used for lithium-sulfur battery and synthesis method of selenium-doped covalent organic framework-sulfur cathode composite material used for lithium-sulfur battery

A technology of covalent organic framework and composite material, applied in the field of selenium-doped covalent organic framework-sulfur cathode composite material and its synthesis, can solve the problem that the dissolution of polysulfide ions cannot be effectively suppressed, the pore size distribution of porous materials is uneven, Weak interaction force and other problems, to achieve the effect of improving capacity retention and cycle stability, improving electrochemical performance, and increasing discharge capacity

Active Publication Date: 2019-11-05
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1) The pore size distribution of porous materials obtained by using organic carbon sources is not uniform, and there is a weak interaction force between carbon and sulfur, which cannot effectively inhibit the dissolution of polysulfide ions
[0007] 2) The synthesis method of porous materials using organic carbon sources requires high heat treatment temperature (>800 ° C), and requires a high-purity protective atmosphere, so the synthesis cost is relatively high

Method used

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  • Selenium-doped covalent organic framework-sulfur cathode composite material used for lithium-sulfur battery and synthesis method of selenium-doped covalent organic framework-sulfur cathode composite material used for lithium-sulfur battery
  • Selenium-doped covalent organic framework-sulfur cathode composite material used for lithium-sulfur battery and synthesis method of selenium-doped covalent organic framework-sulfur cathode composite material used for lithium-sulfur battery
  • Selenium-doped covalent organic framework-sulfur cathode composite material used for lithium-sulfur battery and synthesis method of selenium-doped covalent organic framework-sulfur cathode composite material used for lithium-sulfur battery

Examples

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Embodiment 1

[0034] Mix selenium: terephthalonitrile: sulfur according to the mass ratio of 5:25:70 by ball milling, wherein the ball milling conditions are: the ball-to-material ratio is 1:40, the speed is 300 rpm, the ball milling time is 0.5 hours, sealed in a vacuum In a quartz tube, heat at 160°C for 24 hours, then raise the temperature to 400°C at a heating rate of 10°C / min and hold for 24 hours. The heat treatment atmosphere is N 2 . After completion, cool down to room temperature and take out the sample.

Embodiment 2

[0036] Mix selenium: terephthalonitrile: sulfur according to the mass ratio of 10:20:70 by ball milling, wherein the ball milling conditions are: the ball-to-material ratio is 1:40, the speed is 300 rpm, the ball milling time is 1 hour, sealed in a vacuum In the quartz tube, keep warm at 160°C for 24 hours, then raise the temperature to 400°C at a heating rate of 10°C / min and keep warm for 24 hours, and the heat treatment atmosphere is Ar. After completion, cool down to room temperature and take out the sample.

Embodiment 3

[0038] Mix selenium: terephthalonitrile: sulfur according to the mass ratio of 20:10:70 by ball milling, wherein the ball milling conditions are: the ball-to-material ratio is 1:30, the speed is 400 rpm, the ball milling time is 0.5 hours, sealed in a vacuum In the quartz tube, keep warm at 160°C for 24 hours, then raise the temperature to 400°C at a heating rate of 10°C / min and keep warm for 24 hours, and the heat treatment atmosphere is Ar. After completion, cool down to room temperature and take out the sample.

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Abstract

The invention discloses a selenium-doped covalent organic framework-sulfur cathode composite material used for a lithium-sulfur battery and a synthesis method of the selenium-doped covalent organic framework-sulfur cathode composite material used for the lithium-sulfur battery. The cathode composite material contains a covalent organic framework and Se and S which are loaded into the covalent organic carbon framework. The synthesis method comprises the following steps of conducting grinding or ball milling on selenium, nitrile and sulfur according to a mass ratio of (0.01 to 0.2) to (0.1 to 0.4) to 1 to obtain mixed powder; and conducting thermal treatment after the mixed powder is subjected to vacuum sealing to obtain the selenium-doped covalent organic framework-sulfur cathode compositematerial, wherein a thermal treatment method comprises the steps of conducting thermal treatment on the mixed powder at 100-200 DEG C for 12-24 hours, then elevating the temperature to 400-600 DEG C,and conducting thermal treatment for 20-40 hours. The produced cathode composite material is applied for the lithium-sulfur battery, so that the discharge capacity of the lithium-sulfur battery is greatly improved, and a capacity attenuation rate of the lithium-sulfur battery is significantly reduced.

Description

technical field [0001] The invention belongs to the technical field of battery manufacturing, and in particular relates to a selenium-doped covalent organic framework-sulfur cathode composite material for lithium-sulfur batteries and a synthesis method thereof. Background technique [0002] The increasing depletion of fossil fuels and the increasingly serious environmental problems caused by burning have become two major problems that plague the sustainable development of human society. The development of new clean energy is imminent, and the electrochemical energy storage system, especially the lithium-ion battery system, is highly expected. Secondary lithium-ion batteries will be widely used in the field of electric vehicles or hybrid vehicles in the future. However, the actual energy density of lithium-ion batteries is less than 500Wh Kg due to the limitation of the positive electrode material’s own structure and energy storage mechanism. -1 , unable to meet the future ...

Claims

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Application Information

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IPC IPC(8): B82Y30/00H01M4/36H01M4/38H01M4/60H01M10/052
CPCH01M4/362H01M4/38H01M4/60H01M10/052B82Y30/00H01M2004/021Y02E60/10
Inventor 谭迎宾吕忱孙中渠张丕军
Owner BAOSHAN IRON & STEEL CO LTD