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Rhenium sulfide/nitrogen-doped biomass-based carbon fiber composite material with double-defect structure and preparation method

A technology based on carbon fiber and defect structure, applied in the direction of carbon fiber, structural parts, fiber processing, etc., can solve the problems of electrochemical capacity decay, side reaction, irreversible change of layered structure, etc., to achieve good electrical conductivity, stable physical and chemical properties, The effect of increasing the active surface area

Pending Publication Date: 2020-07-10
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when used as anode materials for sodium-ion batteries, rhenium sulfide faces similar problems to traditional two-dimensional layered transition metal sulfide materials, and its layered structure is prone to irreversible changes after electrochemical cycles.
In addition, the polysulfides produced in the conversion reaction are prone to side reactions with the electrolyte, which causes a rapid decay of the electrochemical capacity.

Method used

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  • Rhenium sulfide/nitrogen-doped biomass-based carbon fiber composite material with double-defect structure and preparation method
  • Rhenium sulfide/nitrogen-doped biomass-based carbon fiber composite material with double-defect structure and preparation method
  • Rhenium sulfide/nitrogen-doped biomass-based carbon fiber composite material with double-defect structure and preparation method

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Embodiment 1

[0030] Such as figure 1 As shown, this embodiment provides a rhenium sulfide / nitrogen-doped biomass-based carbon fiber composite material with a double defect structure. The specific preparation steps are as follows:

[0031] Dissolve ammonium perrhenate, thiourea, and hydroxylamine hydrochloride in deionized water at a molar ratio of 1:2.2:3, and ultrasonically treat for 10 minutes to make it uniformly dispersed to obtain a mixed solution; then add nitrogen-doped biomass-based carbon fiber In this solution, and ultrasonic for 1h; transfer to a hydrothermal kettle for heating for hydrothermal reaction, the reaction temperature is 200 ℃, time is 24h; after the reaction is finished, cool to room temperature, wash the product with a mixed solution of ethanol and water, and Drying at 80℃ for 12h; finally, the product obtained in Ar / H 2 Annealed at 450°C for 2h in an atmosphere to obtain a rhenium sulfide / nitrogen-doped biomass-based carbon fiber composite material with a double defect...

Embodiment 2

[0033] Such as figure 1 As shown, this embodiment provides a rhenium sulfide / nitrogen-doped biomass-based carbon fiber composite material with a double defect structure. The specific preparation steps are as follows:

[0034] Dissolve ammonium perrhenate, thiourea, and hydroxylamine hydrochloride in deionized water at a molar ratio of 1:2.2:2, and ultrasonically treat for 10 minutes to make it evenly dispersed to obtain a mixed solution; then add nitrogen-doped biomass-based carbon fiber In this solution, and ultrasonic for 1h; transfer to a hydrothermal kettle for heating for hydrothermal reaction, the reaction temperature is 200 ℃, time is 24h; after the reaction is finished, cool to room temperature, wash the product with a mixed solution of ethanol and water, and Drying at 80℃ for 12h; finally, the product obtained in Ar / H 2 Annealed at 450°C for 2h in an atmosphere to obtain a rhenium sulfide / nitrogen-doped biomass-based carbon fiber composite material with a double defect st...

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Abstract

The invention discloses a rhenium sulfide / nitrogen-doped biomass-based carbon fiber composite material with a double-defect structure. The preparation method is characterized in that rhenium sulfide nanosheets with interlayer defects grow on the surface of nitrogen-doped biomass-based carbon fiber in situ, and then, sulfur vacancies are introduced through annealing in a reducing Ar / H2 atmosphere,so that the rhenium sulfide / nitrogen-doped biomass-based carbon fiber composite material with a double-defect structure is obtained. The rhenium sulfide in the prepared composite material uniformly grows on the surface of the nitrogen-doped biomass-based carbon fiber, and the composite material has the advantages of large specific surface area, good conductivity, stable physical and chemical properties and the like. The one-dimensional interlayer defect structure provides interconnected channels so as to provide additional ion intercalation / deintercalation sites; besides, the vacancy-rich structure is beneficial to rapid adsorption of sodium ions and can change the charge distribution of the intrinsic state of the material, so that the purposes of increasing active sites and improving theconductivity of the material are achieved, and the material has excellent electrochemical performance.

Description

Technical field [0001] The invention belongs to the technical field of metal sulfide-carbon materials, and specifically relates to a rhenium sulfide / nitrogen-doped biomass-based carbon fiber composite material with a double defect structure and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in the fields of portable energy storage devices, electric vehicles, and large-scale energy storage due to the advantages of long service life and high energy density. However, the development of lithium-ion batteries is challenged by the scarcity and high price of lithium metal resources. In comparison, sodium has more abundant reserves in the earth's crust and is widely distributed. Therefore, sodium ion batteries have been recognized as one of the first choices for replacing lithium ion batteries. [0003] As a new transition metal sulfide, rhenium sulfide has a typical two-dimensional layered structure. In addition, the extremely weak Van...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y30/00D06M13/432D06M13/368D06M11/36D06M101/40
CPCH01M4/362H01M4/5815H01M4/625H01M10/054B82Y30/00D06M13/432D06M13/368D06M11/36H01M2004/021H01M2004/027D06M2101/40Y02E60/10
Inventor 刘天西宗伟赖飞立缪月娥朱晓波欧阳玥郭和乐
Owner DONGHUA UNIV
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