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Carbon/carbon composite material for sodium-ion battery and preparation method thereof

A technology of carbon composite materials and porous carbon, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve the problems of low first-cycle Coulombic efficiency, weak sodium storage capacity, and low degree of graphitization and other problems, to achieve broad industrial application prospects, increase the carbon layer spacing, and improve the effect of specific capacity

Active Publication Date: 2017-07-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although graphite has a high lithium storage capacity, its ability to store sodium is very weak, which is generally believed to be caused by the mismatch between the radius of sodium ions and the spacing between graphite layers.
Amorphous carbon has a low degree of graphitization, and its structure is mainly composed of a large number of disordered carbon crystallites, with a large spacing between carbon layers and a large number of nanopores, which provide ideal active sites for the storage of sodium ions. Therefore, amorphous carbon materials have high reversible sodium storage capacity, but such materials still have problems such as low specific capacity, low first-cycle Coulombic efficiency, and poor rate performance, which greatly limit their application in sodium-ion batteries.

Method used

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  • Carbon/carbon composite material for sodium-ion battery and preparation method thereof
  • Carbon/carbon composite material for sodium-ion battery and preparation method thereof
  • Carbon/carbon composite material for sodium-ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] First weigh 2.457g ferric chloride (9mmol) and 1.275g trimesic acid (6mmol) to make it fully dissolved in 40mL deionized water, then measure the hydrofluoric acid solution of 18mmol (mass percentage concentration is 30%) And 5.42mmol (90% by mass concentration) concentrated nitric acid solution was added dropwise to the above solution. Then, after the above-prepared mixed solution was continuously magnetically stirred for 1 h at room temperature, it was transferred into a hydrothermal reaction kettle to perform a hydrothermal reaction at 170° C. for 18 h. Finally, the tan precipitate obtained from the reaction was repeatedly washed with ethanol and deionized water by centrifugation, and dried to obtain the precursor of the iron-based metal organic framework material MIL-100.

[0051] Weigh 1 g of iron-based metal-organic framework material MIL-100, grind it into powder, and fully disperse it in 300 mL of sucrose solution with a molar concentration of 0.75 mol / L. Subseq...

Embodiment 2

[0059] First weigh 2.457g ferric chloride (9mmol) and 1.913g trimesic acid (9mmol) to make it fully dissolved in 40mL deionized water, then measure the hydrofluoric acid solution of 18mmol (mass percentage concentration is 30%) And 5.42mmol (90% by mass concentration) concentrated nitric acid solution was added dropwise to the above solution. Then, after the above-prepared mixed solution was continuously magnetically stirred for 1 h at room temperature, it was transferred into a hydrothermal reaction kettle to perform a hydrothermal reaction at 150° C. for 18 h. Finally, the tan precipitate obtained from the reaction was repeatedly washed with ethanol and deionized water by centrifugation, and dried to obtain the precursor of the iron-based metal organic framework material MIL-100.

[0060] Weigh 1 g of iron-based metal-organic framework material MIL-100, grind it into powder, and fully disperse it in 300 mL of sucrose solution with a molar concentration of 0.75 mol / L. Subseq...

Embodiment 3

[0063] First take by weighing 2.457g ferric chloride (9mmol) and 2.550g trimesic acid (12mmol) and make it fully dissolved in 40mL deionized water, then measure the hydrofluoric acid solution of 18mmol (mass percentage concentration is 30%) And 5.42mmol (mass percentage concentration: 90%) of concentrated nitric acid solution was added dropwise to the above solution. Then, after the above-prepared mixed solution was continuously magnetically stirred for 1 h at room temperature, it was transferred into a hydrothermal reaction kettle to perform a hydrothermal reaction at 190° C. for 18 h. Finally, the tan precipitate obtained from the reaction was repeatedly washed with ethanol and deionized water by centrifugation, and dried to obtain the precursor of the iron-based metal organic framework material MIL-100.

[0064] Weigh 1 g of iron-based metal-organic framework material MIL-100, grind it into powder, and fully disperse it in 300 mL of sucrose solution with a molar concentrati...

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Abstract

The invention discloses a carbon / carbon composite material for a sodium-ion battery and a preparation method thereof. The carbon / carbon composite material is formed by coating graphitized porous carbon particles with an amorphous porous carbon layer. The preparation method of the carbon / carbon composite material comprises the steps of: carrying out synthesis on water system solution containing metal salt and an organic ligand by a hydrothermal method to form a metal organic frame material; dispersing the metal organic frame material in aqueous carbon solution, and preparing a carbon-coated metal organic frame composite material by a hydrothermal reaction; and carrying out carbonization and acid pickling on the carbon-coated metal organic frame composite material to obtain the carbon / carbon composite material. The prepared carbon / carbon composite material, as a negative electrode of the sodium-ion battery, has excellent long-circulation stability, excellent rate capability and the like, is simple in preparation method and low in cost, and has a wide industrial application prospect.

Description

technical field [0001] The invention relates to a negative electrode material for a sodium ion battery and its preparation method and application, in particular to a carbon / carbon composite material composed of amorphous porous carbon layer coated graphitized porous carbon particles and its preparation method and as a negative electrode for a sodium ion battery The application of materials belongs to the field of sodium ion batteries. Background technique [0002] With the consumption of traditional energy sources such as coal, oil and natural gas and the increasingly severe environmental problems, secondary battery systems play an irreplaceable role as energy storage and conversion devices in the fields of energy, information, communication, and transportation. Since the advent of lithium-ion batteries in the 1980s, it has attracted much attention due to its advantages such as high specific capacity, long cycle life, high operating voltage, zero memory effect and environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/054B82Y30/00
CPCB82Y30/00H01M4/366H01M4/583H01M4/625H01M10/054Y02E60/10
Inventor 张治安杜柯尚国志史晓东赖延清李劼张凯
Owner CENT SOUTH UNIV
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