A kind of preparation method of tungsten disulfide/carbon nanotube negative electrode composite material for sodium ion battery

A technology of carbon nanotubes and tungsten disulfide, which is applied in the field of sodium ion battery anode materials and its preparation, can solve the problems of reducing the cycle stability of electrode materials, low electronic/ion conductivity, and reducing rate performance, etc., and achieve high specific capacity , good repeatability and low cost

Inactive Publication Date: 2018-02-23
CENT SOUTH UNIV
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  • Description
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Problems solved by technology

At the same time, tungsten disulfide also has a high initial specific capacity as a negative electrode material for sodium ion batteries, but due to its low electronic / ionic conductivity, it reduces its rate performance as an electrode material; Severe volume expansion occurs during the sodium ion process, which greatly reduces its cycle stability as an electrode material

Method used

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  • A kind of preparation method of tungsten disulfide/carbon nanotube negative electrode composite material for sodium ion battery
  • A kind of preparation method of tungsten disulfide/carbon nanotube negative electrode composite material for sodium ion battery
  • A kind of preparation method of tungsten disulfide/carbon nanotube negative electrode composite material for sodium ion battery

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Experimental program
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Embodiment 1

[0034]First, take 2g of ammonium phosphotungstate and place it in the upwind zone of the dual-temperature zone tube furnace, take 0.2g of carbon nanotubes and place it in the downwind zone, control the flow rate of the inert gas to 50 sccm, and the downwind zone will rise to 50°C at a rate of 10°C / min , when the temperature rises to the rated temperature, the upwind area rises to 900 °C at a rate of 10 °C / min, and the temperature is kept for 120 min. The product in the downwind area is the tungsten oxide / carbon nanotube composite material. Take 0.5g of tungsten oxide / carbon nanotube composite material and 2.5g of sulfur powder, add 200ml of octylamine-alcohol mixture with a volume ratio of 1:1, ultrasonicate for 5h, and then place it in a 60ml hydrothermal reaction kettle at 250℃ Undertake the hydrothermal reaction for 24 hours, and then the hydrothermal reaction product is suction filtered, washed, and vacuum-dried to obtain a high-purity tungsten disulfide / carbon nanotube com...

Embodiment 2

[0042] First, take 3g of ammonium phosphotungstate and place it in the upwind area of ​​the dual temperature zone tube furnace, take 0.2g of carbon nanotubes and place it in the downwind area, control the flow rate of the inert gas to 50 sccm, and the downwind area will rise to 50°C at a rate of 10°C / min , when the temperature rises to the rated temperature, the upwind area rises to 900 °C at a rate of 10 °C / min, and the temperature is kept for 120 min. The product in the downwind area is the tungsten oxide / carbon nanotube composite material. Take 0.5g of tungsten oxide / carbon nanotube composite material and 4g of sulfur powder, add 200ml of octylamine-alcohol mixture with a volume ratio of 1:1, ultrasonicate for 5h, then place it in a 60ml hydrothermal reaction kettle, and heat it under the condition of 250℃. After thermal reaction for 24 hours, the hydrothermal reaction product was suction-filtered, washed, and vacuum-dried to obtain a high-purity tungsten disulfide / carbon na...

Embodiment 3

[0045] First, take 4g of ammonium phosphotungstate and place it in the upwind area of ​​the dual temperature zone tube furnace, take 0.2g of carbon nanotubes and place it in the downwind area, control the flow rate of the inert gas to 50 sccm, and the downwind area will rise to 50°C at a rate of 10°C / min , when the temperature rises to the rated temperature, the upwind area rises to 900 °C at a rate of 10 °C / min, and the temperature is kept for 120 min. The product in the downwind area is the tungsten oxide / carbon nanotube composite material. Take 0.5g of tungsten oxide / carbon nanotube composite material and 5g of sulfur powder, add 200ml of octylamine-alcohol mixture with a volume ratio of 1:1, ultrasonicate for 5h, and then place it in a 60ml hydrothermal reaction kettle. After thermal reaction for 24 hours, the hydrothermal reaction product was suction-filtered, washed, and vacuum-dried to obtain a high-purity tungsten disulfide / carbon nanotube composite material. Take 0.5g...

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Abstract

Disclosed is a preparation method for a tungsten disulfide / carbon nanotube negative electrode composite material of a sodium ion battery. The preparation method comprises the steps of putting a tungsten source and the carbon nanotubes into an upper air region and a lower air region of a dual-temperature-region tubular furnace to be heated; enabling the tungsten source to be decomposed and deposited to the carbon nanotubes under a high temperature to obtain a tungsten oxide / carbon nanotube compound; then putting the tungsten oxide / carbon nanotube compound, an elementary sulfur, and a reducing agent into a hydrothermal reaction kettle to be reacted; and then carrying out suction filtration on the reaction precipitates by deionized water and absolute ethyl alcohol, and then washing, drying and calcining the processed reaction precipitates to obtain the high-purity tungsten disulfide / carbon nanotube composite material. According to the tungsten disulfide / carbon nanotube composite material prepared by the method, the tungsten disulfide nanosheets are uniformly distributed on the carbon nanotubes; the composite material has an excellent electrochemical performance when the composite material is used as the negative electrode material of the sodium ion battery; and in addition, the tungsten disulfide / carbon nanotube negative electrode composite material is simple in preparation method, low in cost and bright in industrial application prospect.

Description

technical field [0001] The invention relates to a negative electrode material of a sodium ion battery and a preparation method thereof, belonging to the field of sodium ion batteries. Background technique [0002] As a socially dominant electrochemical energy storage device, lithium-ion batteries have achieved good results in portable electronics (laptops, smart mobile devices, tablets, etc.), electric vehicles, and plug-in hybrid electric vehicles. Application prospects. However, due to the lack of metal lithium resources and the high cost of lithium-ion batteries and other limiting factors, the large-scale commercial application of lithium-ion batteries is facing severe challenges. This means that it is imperative to research and develop a battery system that can be commercialized on a large scale and applied industrially. Metal sodium and lithium are in the same main group in the periodic table of elements, and it has similar physical and chemical properties to metal li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5815H01M4/625H01M10/0525Y02E60/10
Inventor 张治安李军明史晓东赖延清张凯李劼
Owner CENT SOUTH UNIV
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