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A hierarchical porous fe 3 the se 4 @nc@cnts Composite materials and their preparation methods and applications

A composite material, fe3se4 technology, applied in the direction of nanotechnology, active material electrode, nanotechnology, etc. for materials and surface science, can solve the problems of poor storage performance, low conductivity and large volume expansion, etc., to achieve uniform shape distribution, The effect of carrying less impurities and shortening the process flow

Active Publication Date: 2022-06-24
HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure FeSe has inherently low conductivity and large volume expansion during intercalation / desodiation, resulting in poor Na + storage performance

Method used

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  • A hierarchical porous fe <sub>3</sub> the se <sub>4</sub> @nc@cnts Composite materials and their preparation methods and applications
  • A hierarchical porous fe <sub>3</sub> the se <sub>4</sub> @nc@cnts Composite materials and their preparation methods and applications
  • A hierarchical porous fe <sub>3</sub> the se <sub>4</sub> @nc@cnts Composite materials and their preparation methods and applications

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Put PVA(M w = 80000) was added to 100 mL of deionized water (the liquid-solid ratio was 12.5), and stirred at room temperature until it became clear to obtain a viscous solution A. 0.1g commercial CNTs, 10g Fe(NO 3 ) 3 , 10g NaCl nanoparticles were added to the viscous solution A, and the gel solution B was obtained by vigorous stirring. The obtained solution was then transferred to a freeze dryer and treated with freeze drying (cold trap temperature -96° C.) for 24 hours to obtain the precursor. After that, 1 g of the precursor and 2 g of selenium powder were selenized at 600 °C for 4 h under an argon protective atmosphere. Finally, the obtained sample was washed with water for several times and dried at 60 °C for 4 h to obtain hierarchical porous Fe. 3 Se 4 @C@CNTs composites. The obtained samples will be analyzed by Japanese Rigaku D / max-2500 X-ray diffraction analyzer, and the results are as follows figure 1 shown. All diffraction peaks of the final product c...

Embodiment 2

[0039] Put PVA(M w = 80000) was added to 100 mL of deionized water (the liquid-solid ratio was 12.5), and stirred at room temperature until it became clear to obtain a viscous solution A. 0.1g commercial CNTs, 10g Fe(NO 3 ) 3 , 5g CH 4 N 2 O, 10g NaCl nanoparticles were added to the viscous solution A, and the gel solution B was obtained by vigorous stirring. The obtained solution was then transferred to a freeze dryer and treated with freeze drying (cold trap temperature -96° C.) for 24 hours to obtain the precursor. Then, 1 g of the precursor and 2 g of selenium powder were selenized at 600 °C for 4 h under an argon protective atmosphere. Finally, the obtained sample was washed with water for several times and dried at 60 °C for 4 h to obtain hierarchical porous Fe. 3 Se 4 @NC@CNTs composites. The obtained samples will be analyzed by Japanese Rigaku D / max-2500 X-ray diffraction analyzer, and the results are as follows Figure 4 shown. All diffraction peaks of the fi...

Embodiment 3

[0041] Put PVA(M w = 80000) was added to 100 mL of deionized water (the liquid-solid ratio was 12.5), and stirred at room temperature until it became clear to obtain a viscous solution A. 0.1 g commercial CNTs and 5 g Fe(NO 3 ) 3 , 5g CH 4 N 2 O, 10 g NaCl nanoparticles were added to the viscous solution A, and the suspension B was obtained by vigorous stirring. The obtained solution was transferred to a freeze dryer and treated with freeze drying (cold trap temperature -96° C.) for 24 hours to obtain the precursor. Finally, 1 g of the precursor and 2 g of selenium powder were selenized at 600 °C for 4 h under an argon protective atmosphere. Finally, the obtained sample was washed with water for many times and dried at 60 °C for 4 h to obtain hierarchical porous Fe. 3 Se 4 @NC@CNTs composites. Using transmission electron microscopy (TEM, JEOL-JEM-2100F) to observe the samples, it was found that the 3D conductive network of porous carbon and many CNTs were intertwined, i...

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Abstract

The invention discloses a layered porous Fe 3 Se 4 @NC@CNTs composites and their preparation and application in sodium-ion batteries. Fe(NO 3 ) 3 , CNTs, CH 4 N 2 O, NaCl nanoparticles were encapsulated into the polymer fiber network and then calcined in protective gas to obtain hierarchical porous Fe 3 Se 4 @NC@CNTs Composites, Fe 3 Se 4 The nanoparticles are well coated in the porous carbon structure, and the CNTs are intertwined to form a 3D conductive network. The invention is easy to operate, the reaction conditions are controllable, the obtained 3D hierarchical porous structure is special, and the specific surface area is large, which not only facilitates the full contact between the electrolyte and the active material, but also effectively adapts to the volume expansion of the material during the charge and discharge process , when used as the anode material of sodium ion battery, its electrochemical performance is greatly improved.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for sodium ion batteries, in particular to a hierarchical porous Fe 3 Se 4 @NC@CNTs composites and their preparation methods and applications. Background technique [0002] With the rapid development of portable electronics and electric vehicles, energy storage devices, such as lithium-ion batteries (LIBs), sodium-ion batteries (SIBs), and zinc-ion batteries (ZIBs), have received more and more attention. Among them, SIBs are considered as one of the most promising candidates due to the abundant reserves of sodium, good electrochemical performance and environmental friendliness. Commercially available graphite is not suitable for anodes of SIBs because the large ionic radius of Na ions makes it difficult to deintercalate Na ions on the graphite layer. Therefore, there is an urgent need to develop next-generation anode materials for SIBs. [0003] In recent years, iron selen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/58H01M10/054B82Y30/00B82Y40/00
CPCH01M4/581H01M4/625H01M10/054B82Y30/00B82Y40/00H01M2004/021H01M2004/027Y02E60/10
Inventor 孔祥忠罗实李实万忠民
Owner HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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