Surface modified porous carbon structural carbon fiber/sulfur composite cathode material and preparation method thereof

A composite cathode material and surface modification technology, applied in structural parts, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve the problems of small specific surface area, uneven sulfur distribution, poor cycle performance, etc., to increase specific surface area, improve Cycle performance, effect of increasing sulfur loading

Active Publication Date: 2014-01-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the defect that the positive electrode material of carbon fiber loaded with sulfur in the prior art has a small specific surface area, a small amount of sulfur loaded and uneven distribution of loaded sulfur. As the number of cycles increases, the loss of sulfur is large, resulting in poor cycle performance. The purpose is to It is to provide a positive electrode material with high specific capacity and high active sulfur utilization rate, which can greatly improve the cycle performance of lithium-sulfur batteries

Method used

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  • Surface modified porous carbon structural carbon fiber/sulfur composite cathode material and preparation method thereof
  • Surface modified porous carbon structural carbon fiber/sulfur composite cathode material and preparation method thereof
  • Surface modified porous carbon structural carbon fiber/sulfur composite cathode material and preparation method thereof

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Effect test

Embodiment 1

[0032] Add 1.5g of hollow carbon fiber into the organic solvent, isolate the air and sonicate for 0.5h so that the carbon fiber is fully dispersed in 40mL of organic solvent dimethylformamide (DMF), and 1.046g of Zn(NO 3 ) 2 4H 2 O and 0.222g of terephthalic acid organic ligands were added to the carbon fiber dispersion, and the ultrasonic treatment was continued for 0.5h. After the precursor solution was mixed evenly, the precursor solution was transferred to a polytetrafluoroethylene-lined reactor; With a heating rate of 2°C / min, the temperature was heated from room temperature to 110°C and kept for 8 hours; after the solution was cooled to room temperature, the crystallized product was washed with an organic solvent, centrifuged, filtered, and dried to obtain metal-organic framework-coated carbon fibers composite material. A certain amount of metal-organic framework-coated carbon fibers was transferred to a tube furnace, and under the protection of inert gas nitrogen, the...

Embodiment 2

[0036] Add 4g of solid carbon fiber into the organic solvent, and treat it sonically for 0.5h without air so that the carbon fiber is fully dispersed in 40mL of organic solvent dimethylformamide (DMF), and 1.668g of Zn(NO 3 ) 2 ·6H 2 O and 0.357g of 2,5-dihydroxyterephthalic acid organic ligand were added to the carbon fiber dispersion, and the ultrasonic treatment was continued for 0.5h. After the precursor solution was mixed evenly, the precursor solution was transferred to the Teflon-lined In a reaction kettle; at a heating rate of 2°C / min, heat the temperature from room temperature to 150°C and keep it for 8 hours; after the solution is cooled to room temperature, wash the crystals with an organic solvent, centrifuge, filter, and dry to obtain metal Organic frame clad in carbon fiber composite. A certain amount of metal-organic framework-coated carbon fibers was transferred to a tube furnace, and under the protection of inert gas nitrogen, the temperature was raised from...

Embodiment 3

[0038] Add 1.5g of solid carbon fiber to the organic solvent, isolate the air and sonicate for 0.5h so that the carbon fiber is fully dispersed in 40mL of organic solvent N,N'-diethylformamide (DEF), and 1.668g of Zn(NO 3 ) 2 ·6H 2 O and 0.357g of 2,5-dihydroxyterephthalic acid organic ligand were added to the carbon fiber dispersion, and the ultrasonic treatment was continued for 0.5h. After the precursor solution was mixed evenly, the precursor solution was transferred to the polytetrafluoroethylene-lined In a reaction kettle; at a heating rate of 2°C / min, heat the temperature from room temperature to 200°C and keep it for 8 hours; after the solution is cooled to room temperature, wash the crystals with an organic solvent, centrifuge, filter, and dry to obtain metal Organic frame clad in carbon fiber composite. A certain amount of metal-organic framework-coated carbon fibers was transferred to a tube furnace, and under the protection of inert gas nitrogen, the temperature ...

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Abstract

The invention discloses a surface modified porous carbon structural carbon fiber/sulfur composite cathode material and a preparation method thereof. The composite cathode material is formed by compounding surface modified porous carbon structural carbon fiber and elemental sulfur. The preparation method comprises the steps: firstly, preparing an organic metal frame coated carbon fiber composite by using a solvothermal method; carbonizing the composite at high temperature; and then, compounding the composite with sulfur to obtain the surface modified porous carbon structural carbon fiber/sulfur composite cathode material. The preparation method is simple; the adopted raw materials are low in cost; the prepared composite cathode material has high specific capacity and high utilization ratio of active sulfur; the cycle performance of a lithium sulfur battery is greatly improved.

Description

technical field [0001] The invention relates to a carbon fiber / sulfur composite anode material with a surface-modified porous carbon structure and a preparation method thereof, belonging to the field of new energy. Background technique [0002] With the development of human society, problems such as energy shortage and environmental pollution have become increasingly prominent, and people's understanding and requirements for chemical power sources have become higher and higher, prompting people to continuously explore new energy storage systems based on chemical power sources. Lithium metal-based batteries have led the development of high-performance chemical power sources in recent decades. With the successful commercialization of lithium-ion batteries, countries around the world are stepping up research on lithium-ion power batteries for vehicles. However, due to factors such as energy density, safety, and price, conventional lithium-ion batteries such as lithium cobalt o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62
CPCY02E60/12H01M4/13H01M4/362H01M4/625Y02E60/10
Inventor 张治安包维斋李强周成坤李劼
Owner CENT SOUTH UNIV
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