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Preparation method of vanadium tetrasulfide/carbon nanotube as negative electrode material for sodium ion battery

A sodium-ion battery and negative electrode material technology, which is applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of easy deposition of compounds on the surface of particles, reduce the electrochemical performance of materials, and reduce the conductivity of materials, so as to shorten the ion Diffusion distance, stable Coulombic efficiency, and low cost effects

Inactive Publication Date: 2019-01-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although, based on the above special physical properties, vanadium tetrasulfide VS 4 With high theoretical capacity, excellent charge-discharge rate performance and cycle performance, however, vanadium tetrasulfide VS 4 There are also some disadvantages, such as poor conductivity and small specific surface area
[0006] At present, researchers have successfully introduced carbon nanotubes into transition metal sulfides, and achieved certain effects. However, the particle size of the transition metal sulfide particles prepared is too small (<50 nm), which can shorten the ion density. Diffusion distance, but side reactions between the surface of the particles and the electrolyte are prone to occur, and the specific capacity of the material is lost; at the same time, the compounds formed by the side reactions are easy to deposit on the surface of the particles, increasing the resistance of the material and reducing the electrochemical performance of the material; moreover, Carbon nanotubes are used as the carrier, and carbon nanotubes are easy to agglomerate, which eventually leads to a decrease in the conductivity of the overall material

Method used

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  • Preparation method of vanadium tetrasulfide/carbon nanotube as negative electrode material for sodium ion battery
  • Preparation method of vanadium tetrasulfide/carbon nanotube as negative electrode material for sodium ion battery
  • Preparation method of vanadium tetrasulfide/carbon nanotube as negative electrode material for sodium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0039] (1) Add 0.5mmol (58.5mg) ammonium metavanadate to 10mL ultrapure water, heat to 65°C, and keep stirring at 450 rpm until dissolved, then add 2.5mmol (187.5mg) thioethyl Amide, heated to 55°C, and kept stirring at 550 rpm until dissolved to obtain solution A;

[0040] (2) Add 2 mmol (24 mg) of multi-walled carbon nanotubes into 15 mL of ultrapure water, and ultrasonicate for 5 h at 450 W until the CNTs are uniformly dispersed to obtain suspension B;

[0041] (3) Add solution A obtained in step (1) into suspension B, and continue stirring at 500 rpm for 2.5 hours to obtain suspension C;

[0042] (4) Heat the suspension C obtained in step (3), conduct a hydrothermal reaction at 160°C for 24 hours, then cross-wash with deionized water and ethanol for 5 times, centrifuge at 7000 rpm, and then place at 60°C , and dried for 16 hours to obtain vanadium tetrasulfide / carbon nanotubes, a negative electrode material for sodium ion batteries.

[0043] Such as figure 1 As shown, the...

Embodiment 2

[0050] (1) Add 0.1mmol (13.8mg) potassium metavanadate to 10mL ultrapure water, heat to 70°C, and keep stirring at 550 rpm until dissolved, then add 0.55mmol (41.25mg) thioethyl Amide, heated to 50°C, and kept stirring at 600 rpm until dissolved to obtain solution A;

[0051] (2) Add 3 mmol (36 mg) of multi-walled carbon nanotubes into 20 mL of ultrapure water, and ultrasonicate for 6 h at 350 W until the CNTs are uniformly dispersed to obtain suspension B;

[0052] (3) Add solution A obtained in step (1) into suspension B, and continue stirring at 400 rpm for 4 hours to obtain suspension C;

[0053] (4) Heat the suspension C obtained in step (3), conduct a hydrothermal reaction at 230°C for 36 hours, then cross-wash with deionized water and ethanol for 5 times, centrifuge at 8500 rpm, and then place at 80°C , and dried for 12 hours to obtain vanadium tetrasulfide / carbon nanotubes, a negative electrode material for sodium ion batteries.

[0054] The peak value of the vanadiu...

Embodiment 3

[0061] (1) Add 1mmol (121.9mg) sodium metavanadate to 15mL ultrapure water, heat to 50°C, and keep stirring at 250 rpm until dissolved, then add 5.7mmol (427.5mg) thioacetamide , heated to 90°C, and kept stirring at 600 rpm until dissolved to obtain solution A;

[0062] (2) Add 20mmol (240mg) of multi-walled carbon nanotubes into 15mL of ultrapure water, and ultrasonicate for 5h at 500W until the CNTs are uniformly dispersed to obtain suspension B;

[0063] (3) Add the solution A obtained in step (1) into the suspension B, and continue stirring at 300 rpm for 3.5 hours to obtain the suspension C;

[0064] (4) Heat the suspension C obtained in step (3), conduct a hydrothermal reaction at 210°C for 20 hours, then cross-wash with deionized water and ethanol for 5 times, centrifuge at 6500 rpm, and then place at 55°C , and dried for 17 hours to obtain vanadium tetrasulfide / carbon nanotubes, a negative electrode material for sodium ion batteries.

[0065] The peak value of the va...

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Abstract

A method for preparing a vanadium tetrasulfide / carbon nanotube as a negative electrode material of a sodium ion battery is characterized by comprising the following steps: (1) adding a vanadium sourceinto water, heating and continuously stirring until dissolved, adding a sulfur source, heating and continuously stirring until dissolved to obtain a solution A; 2. Adding multi-wall carbon nanotubesinto water for ultrasonic treatment to obtain a suspension B; 3) adding the solution A into a suspension B, and continuously stirring to obtain a suspension C; 4) heating the suspension C obtained inthe Step 3), carrying out hydrothermal reaction, centrifugal washing and drying to obtain the vanadium tetrasulfide / carbon nanotube as the negative electrode material of a sodium ion battery. The method of the invention is simple in operation and low in cost, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing a negative electrode material of a sodium ion battery, in particular to a method for preparing a negative electrode material of a sodium ion battery, vanadium tetrasulfide / carbon nanotube. Background technique [0002] Since the 21st century, lithium-ion batteries have become a part of our lives. Lithium-ion battery portable devices and powered vehicles have been found in every corner of our lives. However, the scarce lithium resources make the cost of lithium-ion batteries continue to rise in the future. Finding an alternative low-cost electrochemical energy storage device has become an urgent problem to be solved. The electrochemical properties of sodium are similar to lithium, and the earth has abundant reserves, so it is the best choice to replace lithium-ion batteries in the future. [0003] Sulfides are firstly used as positive electrode materials for sodium-ion battery electrodes, and have high e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/362H01M4/5815H01M4/625H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 郑俊超肖彬贺振江汤林波安长胜童汇
Owner CENT SOUTH UNIV
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