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A kind of sodium ion battery sulfur-doped molybdenum selenide negative electrode composite material and preparation method thereof

A sodium-ion battery and composite material technology, applied in the field of sodium-ion batteries, can solve problems such as difficult to meet the requirements of sodium-ion batteries, unsatisfactory rate performance, complicated preparation methods, etc., to achieve increased reaction interface, good material conductivity and mechanical properties The effect of simple performance and preparation method

Active Publication Date: 2018-07-06
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Molybdenum sulfide has the advantage of high theoretical capacity, but its conductivity is relatively poor, resulting in unsatisfactory rate performance
The conductivity of molybdenum selenide is better than that of molybdenum sulfide, but its theoretical capacity is relatively low, which is difficult to meet the requirements of sodium ion batteries
At the same time, the currently synthesized layered transition metal chalcogenides are too large in size, single in structure, and complicated in preparation methods, which limit their application in sodium-ion batteries.

Method used

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  • A kind of sodium ion battery sulfur-doped molybdenum selenide negative electrode composite material and preparation method thereof
  • A kind of sodium ion battery sulfur-doped molybdenum selenide negative electrode composite material and preparation method thereof
  • A kind of sodium ion battery sulfur-doped molybdenum selenide negative electrode composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Add 0.8g of ammonium molybdate, 0.1g of carbon nanotubes, 0.33g of potassium borohydride and 0.1g of polyvinylpyrrolidone into the aqueous solution, and react under hydrothermal conditions at 185°C for 30h to obtain molybdenum oxide / carbon composite materials.

[0052] Then add 0.5 molybdenum oxide / carbon composite material into 40ml alcohol solution and ultrasonically disperse for 40min to obtain a dispersion liquid, add 12ml hydrazine hydrate, 0.16g selenium powder and 0.08g thiourea to the dispersion liquid and fully dissolve them, Reaction in the reactor for 24h. After the reaction product is washed and dried at 70°C, the precursor of the sulfur-doped molybdenum selenide / carbon composite material is obtained. After annealing at 600°C for 6 hours under the condition of argon atmosphere, the obtained composite material has a diameter of 60-100nm (that is, the diameter of carbon nanotubes with sulfur-doped molybdenum selenide is 60-100nm), in which sulfur-doped flake s...

Embodiment 2

[0062] Add 0.45g of sodium molybdate, 0.15g of carbon nanotubes, 0.33g of sodium borohydride and 0.07g of sodium dodecylbenzenesulfonate into the aqueous solution, and react under hydrothermal conditions at 195°C for 28 hours to obtain molybdenum oxide / carbon composite material. Then 0.4g of molybdenum oxide / carbon composite material was added into 40ml of alcoholic solution and ultrasonically dispersed for 40min to obtain a dispersion. In said dispersion, 11ml of n-octylamine, 0.2g of selenium dioxide and 0.057g of sulfur powder were added and fully dissolved. React in a reactor at 205°C for 25h. After the reaction product is washed and dried at 70°C, the precursor of the sulfur-doped molybdenum selenide / carbon composite material is obtained. After annealing at 600°C for 7 hours in a nitrogen atmosphere, a composite material with a diameter of 100-120nm (that is, a carbon nanotube with sulfur-doped molybdenum selenide has a diameter of 100-120nm), in which sulfur-doped molyb...

Embodiment 3

[0066] Add 0.72g of sodium molybdate, 0.08g of carbon nanotubes, 0.73g of sodium sulfite, and 0.09g of sodium dodecylbenzenesulfonate into the aqueous solution, and react under hydrothermal conditions at 195°C for 28 hours to obtain molybdenum oxide / carbon composites . Then 0.48g of molybdenum oxide / carbon composite material was added into 40ml of alcohol solution and ultrasonically dispersed for 40min to obtain a dispersion. In the dispersion, 10ml of ethylenediamine, 0.12g of selenium powder and 0.048g of sulfur powder were added and fully dissolved. Reaction in a reactor at 190°C for 20h. After the reaction product is washed and dried at 70°C, the precursor of the sulfur-doped molybdenum selenide / carbon composite material is obtained. After annealing at 700°C for 8 hours under the inert atmosphere of helium, the diameter of the composite material is 120-140nm (that is, the diameter of carbon nanotubes with sulfur-doped molybdenum selenide is 100-120nm), and the sulfur-dope...

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Abstract

The invention relates to a sulfur-doped molybdenum selenide negative composite material for a sodium-ion battery and a preparation method of the sulfur-doped molybdenum selenide negative composite material, and belongs to the technical field of sodium-ion batteries. The sulfur-doped molybdenum selenide negative composite material comprises sulfur-doped molybdenum selenide and a carbon nanotube, wherein the sulfur-doped molybdenum selenide is evenly deposited for growth on the surface of the carbon nanotube to form a three-dimensional conductive network. According to the preparation method, a molybdenum oxide evenly grows on the surface of the carbon nanotube through a hydrothermal synthesis method; with the molybdenum oxide / carbon nanotube composite material as a molybdenum source and a carbon source, the molybdenum oxide / carbon nanotube composite material is evenly dispersed into an alcoholic solution; a reducing agent, a selenium source and a sulfur source are added; the alcoholic solution is cooled and dried to a room temperature after hydrothermal reaction; and then the sulfur-doped molybdenum selenide negative composite material is obtained through high-temperature calcination treatment. The preparation method is simple, reliable, good in process repeatability, high in operability, low in cost and applicable to industrial production. The composite material shows high specific capacity and long cycling stability when applied to the sodium-ion battery.

Description

technical field [0001] The invention relates to a sulfur-doped molybdenum selenide negative electrode composite material for a sodium ion battery and a preparation method thereof, belonging to the technical field of sodium ion batteries. Background technique [0002] Lithium-ion batteries have been widely used in hybrid vehicles, electrical energy storage devices, and mobile electronic devices. Lithium consumption has also increased dramatically with the increase in demand for hybrid vehicles and electrical energy storage devices. However, considering that the element content of lithium in the earth's crust is relatively small and it is difficult to extract, it is imminent to develop a new battery system. [0003] Due to the wide distribution of sodium resources, abundant reserves in nature, low cost of raw materials, and similar chemical properties to lithium, sodium-ion batteries are considered to be secondary batteries with great application prospects, and may replace li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y30/00
CPCB82Y30/00H01M4/366H01M4/581H01M4/625H01M10/054Y02E60/10
Inventor 张治安杨幸史晓东赖延清李劼张凯
Owner CENT SOUTH UNIV
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