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Nickel-doped tungsten disulfide/graphene oxide composite electrode material and preparation method and application thereof

A graphene composite, tungsten disulfide technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, negative electrodes, etc., can solve problems such as low electron mobility, poor cycle stability, structural damage and collapse , to achieve the effect of low cost of raw materials, inhibition of agglomeration, and short time consumption

Pending Publication Date: 2020-11-03
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although WS 2 It has a large specific surface area, but its electron mobility is low and it can provide a small capacitance
Moreover, the large volume expansion during its charging and discharging process will cause the collapse of the structure, resulting in poor cycle stability.

Method used

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  • Nickel-doped tungsten disulfide/graphene oxide composite electrode material and preparation method and application thereof
  • Nickel-doped tungsten disulfide/graphene oxide composite electrode material and preparation method and application thereof
  • Nickel-doped tungsten disulfide/graphene oxide composite electrode material and preparation method and application thereof

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preparation example Construction

[0029] The invention discloses a nickel-doped tungsten disulfide / graphene oxide (WS 2 / GO) preparation method of composite electrode material, comprises the following steps:

[0030] Step 1: Add a certain amount of sodium tungstate dihydrate and thiourea into 30-60mL ethanol solution and magnetically stir until completely dissolved to form a blue-black suspension A. The stirring speed is 500-800r / min, and the stirring time is 30-120min. Control the molar ratio of tungsten source and sulfur source to 1:(5~15).

[0031] Step 2: Add nickel nitrate hexahydrate to solution A and stir until completely dissolved, control the molar ratio of sodium tungstate dihydrate and nickel nitrate hexahydrate to (5-15):1 stirring speed 500-800r / min, stirring time 10-30min.

[0032] Step 3: Transfer the above solution to a 100mL polytetrafluoroethylene reactor for homogeneous reaction, the reaction temperature is 200-240°C, the reaction time is 12-48h, and naturally cool to room temperature afte...

Embodiment 1

[0037] Step 1: Add a certain amount of sodium tungstate dihydrate and thiourea into 60mL ethanol solution and magnetically stir until completely dissolved to form a blue-black suspension A. The stirring speed is 500-800r / min, and the stirring time is 30-120min. Control the molar ratio of tungsten source and sulfur source to be 1:5.

[0038] Step 2: Add nickel nitrate hexahydrate into solution A and stir until completely dissolved, control the molar ratio of sodium tungstate dihydrate and nickel nitrate hexahydrate to 5:1, stir at a speed of 500r / min, and stir for 30min.

[0039] Step 3: Transfer the above solution to a 100mL polytetrafluoroethylene reactor for homogeneous reaction, the reaction temperature is 200°C, the reaction time is 12h, and naturally cool to room temperature after the reaction.

[0040] Step 4: Open the reaction kettle, take out the product, wash it with absolute ethanol and deionized water in turn, and centrifuge it, repeat the washing 4 times, and dry i...

Embodiment 2

[0043] Step 1: Add a certain amount of sodium tungstate dihydrate and thiourea into 30mL ethanol solution and magnetically stir until completely dissolved to form a blue-black suspension A. The stirring speed is 800r / min and the stirring time is 120min. Control the molar ratio of tungsten source and sulfur source to be 1:8.

[0044] Step 2: Add nickel nitrate hexahydrate into solution A and stir until completely dissolved, control the molar ratio of sodium tungstate dihydrate and nickel nitrate hexahydrate to 10:1, stir at a speed of 500r / min, and stir for 30 minutes.

[0045] Step 3: Transfer the above solution to a 100mL polytetrafluoroethylene reactor for homogeneous reaction, the reaction temperature is 240°C, the reaction time is 24h, and naturally cool to room temperature after the reaction.

[0046] Step 4: Open the reaction kettle, take out the product, wash it with absolute ethanol and deionized water in turn, and centrifuge it. After repeated washing 6 times, put it ...

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Abstract

The invention discloses a nickel-doped tungsten disulfide / graphene oxide composite electrode material as well as a preparation method and application thereof, and belongs to the technical field of preparation of tungsten disulfide nano materials. The preparation method is realized by a solvothermal reaction one-step method and comprises the following steps: growing tungsten disulfide nanosheets bytaking graphene oxide as a matrix, and doping nickel to prepare a nickel-doped tungsten disulfide / graphene oxide composite electrode material. The preparation method is simple and controllable in operation process, low in cost and capable of realizing large-scale production. The invention also discloses a nickel-doped tungsten disulfide / graphene oxide composite electrode material prepared by themethod. Since graphene oxide has a large specific surface area and good flexibility, agglomeration of tungsten disulfide nanosheets is inhibited, the cycling stability of the material is improved, andthe conductivity of the material is improved and active sites are increased due to nickel doping, therefore, the material can be applied to a negative electrode material of a battery, and has wide research values and application values in the field of electrochemistry.

Description

technical field [0001] The invention belongs to the technical field of preparation of tungsten disulfide nanomaterials, and relates to a nickel-doped tungsten disulfide / graphene oxide composite electrode material and a preparation method and application thereof. Background technique [0002] Tungsten disulfide (WS 2 ) nanosheets are typical two-dimensional layered transition metal dichalcogenides, the inner layer is a covalent bond (S—W—S) with strong force, and the van der Waals force is weaker between layers, and the layer The larger spacing is about 0.62nm, which is conducive to the diffusion of smaller metal ions in the matrix. This special structure can promote the further reaction of lithium ions and sodium ions with the matrix material. WS 2 The structure of nanosheets is similar to graphite stacking 2D monolayers through weak van der Waals interactions, and the 2D structure can provide a large surface area and 2D percolation channels to facilitate rapid electron tr...

Claims

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Application Information

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IPC IPC(8): C01G53/11C01B32/198H01M4/36H01M4/58H01M4/62H01M10/054B82Y30/00B82Y40/00
CPCC01G53/11C01B32/198H01M4/362H01M4/5815H01M4/626H01M4/628H01M10/054B82Y30/00B82Y40/00H01M2004/021H01M2004/027C01P2002/72C01P2004/03C01P2004/04C01P2006/40C01P2004/80C01P2004/20Y02E60/10
Inventor 黄剑锋罗晓敏曹丽云李嘉胤王瑜航王羽偲嘉王芳敏
Owner SHAANXI UNIV OF SCI & TECH
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