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Method for preparing flexible MoS2/CNFs sodium ion battery negative electrode material by combining electrostatic spinning and hydrothermal method, and product

A sodium-ion battery and electrospinning technology, applied in the field of electrochemical energy storage, can solve the problems of inflexibility and inability to meet the needs of flexible devices, etc., and achieve the effect of favorable layer spacing, good sodium storage performance, and improved battery performance

Active Publication Date: 2018-11-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the MoS prepared by this combined electrospinning and vapor deposition method 2 / CNFs composite material is not flexible, and binders and conductive agents need to be added in the electrode preparation process, and it is coated on the metal current collector, which cannot meet the needs of today's flexible devices.

Method used

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  • Method for preparing flexible MoS2/CNFs sodium ion battery negative electrode material by combining electrostatic spinning and hydrothermal method, and product
  • Method for preparing flexible MoS2/CNFs sodium ion battery negative electrode material by combining electrostatic spinning and hydrothermal method, and product
  • Method for preparing flexible MoS2/CNFs sodium ion battery negative electrode material by combining electrostatic spinning and hydrothermal method, and product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1) Dissolve 1g of polyacrylonitrile in 10g of DMF and stir well to form a uniform solution.

[0048] 2) Electrospinning: Put the solution prepared in step 1) into a syringe, connect the syringe to a stainless steel needle through a catheter, and use a syringe pump to control the flow rate of 4 mL / h to spray the solution through the needle. Aluminum foil was used as the nanofiber collector, and the vertical distance from the needle was 15 cm, and it was grounded at the same time. Connect the needle tube and the aluminum foil to the two poles of the high-voltage generator respectively, the voltage is 15kv, and the temperature is 40°C and the humidity is 60%, and the organic nanofibers are started to be obtained on the aluminum foil.

[0049] 3) The obtained organic nanofibers were placed in a sealed tube, and under the protection of Ar, the temperature was raised to 800°C at 5°C / min for 3 hours, and then cooled naturally to obtain flexible CNFs nanomaterials.

[0050] f...

Embodiment 2

[0052] 1) Take 0.15g sodium molybdate, 0.4g L-cysteine, dissolve in 30mL deionized water, and ultrasonically dissolve;

[0053] 2) Put the solution obtained in step 1) into a 50mL reactor, and react for 8 hours at a temperature of 180°C. get nano-MoS 2 Material;

[0054] 3) The resulting nano-MoS 2 The material was placed in a sealed tube under Ar / H 2 Atmosphere (volume ratio Ar:H 2 =0.92:0.08, 40mL / min), raise temperature at 2°C / min to 800°C for 2 hours, cool naturally after completion, and MoS can be obtained 2 Material.

[0055] figure 2 MoS prepared for this example 2 The SEM image of the material, by figure 2 It can be seen that when the flexible CNFs are not added as the growth substrate, the synthesized MoS 2 have the shape of nanospheres.

Embodiment 3

[0057] 1) Dissolve 1g of polyacrylonitrile in 12g of DMF and stir well to form a uniform solution.

[0058] 2) Electrospinning: Put the solution prepared in step 1) into a syringe, connect the syringe to a stainless steel needle through a catheter, and use a syringe pump to control the flow rate of 6 mL / h to spray the solution through the needle. Aluminum foil was used as the nanofiber collector, and the vertical distance from the needle was 18 cm, and it was grounded at the same time. Connect the needle tube and the aluminum foil to the two poles of the high-voltage generator, the voltage is 18kv, and the temperature is 40°C and the humidity is 60%, and the organic nanofibers are started to be obtained on the aluminum foil.

[0059] 3) Place the obtained organic nanofibers in a sealed tube, under the protection of Ar, raise the temperature at 5°C / min to 800°C for 3 hours, and cool naturally after completion, to obtain flexible carbon nanofibers.

[0060] 4) Take 0.2g sodium ...

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Abstract

The invention discloses a method for preparing a flexible MoS2 / CNFs sodium ion battery negative electrode material by combining electrostatic spinning and a hydrothermal method, and a product. The method comprises the following steps of 1) synthesizing carbon nanofibers by utilizing an electrostatic spinning technology; 2) taking the carbon nanofibers as a precursor, carrying out a hydrothermal reaction in an aqueous solution comprising a molybdenum source and a sulfur source to obtain a MoS2 / CNFs compound; and 3) performing high-temperature annealing treatment to obtain a MoS2 / CNFs compositematerial. The MoS2 / CNFs composite material is simple in preparation process, the cost is low, the processing is easy, and the method can be used for large-scale production. By virtue of the expanded layer spacing of the material and the stable three-dimensional conductive network, the electrochemical performance of the material is improved, the material can be used as a negative electrode materialof the sodium ion battery, and the transfer rate of electrons and sodium ions can be accelerated. The MoS2 / CNFs composite material is high in capacity, long in cycle life and excellent in rate performance, and has a high prospect in future commercial application.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage, in particular to a method for preparing flexible MoS by combining electrospinning and hydrothermal method 2 A method and product of CNFs sodium ion battery negative electrode material. Background technique [0002] The global energy crisis and environmental pollution are two difficult problems facing human society today. Energy is the material basis of human activities. Today, with the rapid development of the global economy, international energy security has risen to the height of the country. All countries have formulated energy policies with energy supply security as the core to prevent energy crises. Energy is the blood and power of the national economy, it is related to the normal operation and development of the economy and society, and it is related to economic security and national security. Energy security directly affects national security, sustainable development and soc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y30/00B82Y40/00
CPCH01M4/362H01M4/5815H01M4/62H01M4/625H01M4/628H01M10/054B82Y30/00B82Y40/00Y02E60/10
Inventor 张磊李巍毕然黄华文刘国学
Owner SOUTH CHINA UNIV OF TECH
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