Application of red phosphorus/carbon nanotube composite material in sodium ion capacitor

A technology of carbon nanotubes and composite materials, which is applied in the application field of red phosphorus/carbon nanotube composite materials in sodium ion capacitors, and can solve problems such as electrode damage and slow diffusion of sodium ions

Active Publication Date: 2021-12-03
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcoming of above-mentioned prior art, provide a kind of application of red phosphorus / carbon nanotube composite material in sodium ion capacitor, to solve the prior art, sodium ion diffusion is slow and in charge and discharge process The problem that the electrode is prone to large damage

Method used

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  • Application of red phosphorus/carbon nanotube composite material in sodium ion capacitor
  • Application of red phosphorus/carbon nanotube composite material in sodium ion capacitor
  • Application of red phosphorus/carbon nanotube composite material in sodium ion capacitor

Examples

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Effect test

Embodiment 1

[0038] Under an argon protective atmosphere, the red phosphorus was put into a ball mill jar for ball milling for 24 hours at a milling speed of 500 r / min. The obtained red phosphorus and carbon nanotubes are uniformly mixed according to the mass ratio of 2:1, and the obtained mixture is put into a glass tube to evacuate into a vacuum atmosphere, and heated with a muffle furnace. The temperature program of the muffle furnace is set as follows: at 5°C min -1 Raise the temperature to 450°C at a rate of 2 hours, then keep it at this temperature for 2 hours, and then increase the temperature at 2°C·min -1 Cooled to 300°C at a constant rate, then maintained at this temperature for 12 hours, and finally cooled naturally to room temperature. Finally, the red phosphorus / carbon nanotube composite material is obtained. The obtained red phosphorus / carbon nanotube composite material is used as the negative electrode, and the activated carbon is used as the positive electrode to assemble...

Embodiment 2

[0042]Under an argon protective atmosphere, the red phosphorus was put into a ball mill jar for ball milling for 24 hours at a milling speed of 500 r / min. The obtained red phosphorus and carbon nanotubes are uniformly mixed according to the mass ratio of 2:1, and the obtained mixture is put into a glass tube to evacuate into a vacuum atmosphere, and heated with a muffle furnace. The temperature program of the muffle furnace is set as follows: at 5°C min -1 Raise the temperature to 450°C at a rate of 2 hours, then keep it at this temperature for 2 hours, and then increase the temperature at 2°C·min -1 Cooled to 300°C at a constant rate, then maintained at this temperature for 12 hours, and finally cooled naturally to room temperature. Finally, the red phosphorus / carbon nanotube composite material is obtained. The obtained red phosphorus / carbon nanotube composite material is used as the negative electrode, and the activated carbon is used as the positive electrode to assemble ...

Embodiment 3

[0045] Under an argon protective atmosphere, the red phosphorus was put into a ball mill jar for ball milling for 20 hours, and the ball milling speed was 600r / min. The obtained red phosphorus and carbon nanotubes are uniformly mixed according to the mass ratio of 2:1, and the obtained mixture is put into a glass tube to evacuate into a vacuum atmosphere, and heated with a muffle furnace. The temperature program of the muffle furnace is set as follows: at 3°C ​​min -1 Raise the temperature to 450°C at a rate of 2 hours, then keep it at this temperature for 2 hours, and then increase the temperature at 2°C·min -1 Cooled to 300°C at a constant rate, then maintained at this temperature for 12 hours, and finally cooled naturally to room temperature. Finally, the red phosphorus / carbon nanotube composite material is obtained. The obtained red phosphorus / carbon nanotube composite material is used as the negative electrode, and the activated carbon is used as the positive electrode ...

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Abstract

The invention discloses an application of a red phosphorus / carbon nanotube composite material in a sodium ion capacitor. Ball-milled red phosphorus and carbon nanotubes are uniformly compounded through an evaporation-deposition method to obtain the red phosphorus / carbon nanotube composite material. Phosphorus is used as an alloying reaction type negative electrode material, the high theoretical specific capacity of 2596 mAh.g<-1> and the low discharge potential are achieved, meanwhile, the rate capability of phosphorus is improved in a carbon compounding mode, and the high-specific-energy sodium ion capacitor is constructed. The red phosphorus with high theoretical specific capacity can improve the energy density of the capacitor, and the introduction of the carbon nanotubes enhances the conductivity of the material and alleviates the volume expansion of the red phosphorus, so that the capacitor shows high power density and cycling stability. The energy density of the obtained sodium ion capacitor can reach 78.32 Wh.kg<-1>, and the power density of the obtained sodium ion capacitor can reach 4.18 kW.kg<-1>.

Description

technical field [0001] The invention belongs to the field of batteries / capacitors, and in particular relates to the application of a red phosphorus / carbon nanotube composite material in sodium ion capacitors. Background technique [0002] At present, the development of clean energy and the establishment of efficient energy storage systems are becoming more and more important. Commercial lithium-ion batteries have high energy density (150-200Wh·kg -1 ), but the power density is not ideal (below 350W·kg -1 ). At the same time, supercapacitors have ultra-high power density (about 10kW·kg -1 ), however the energy density is relatively low (below 10Wh·kg -1 ). Lithium-ion capacitors have attracted the attention of some experts and scholars, and in order to achieve large-scale energy storage, research on sodium-ion capacitors has the advantages of low cost and wide sources. The charging and discharging mechanism of sodium ion capacitors is as follows: the positive electrode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/36H01G11/30H01G11/86
CPCH01G11/36H01G11/30H01G11/86Y02E60/13
Inventor 宋江选张婷冯杨阳
Owner XI AN JIAOTONG UNIV
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