Tungsten sulfide/CNTs (carbon nanotubes)-C composite electrode material and preparation method thereof

A composite electrode and composite material technology, applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve the problem of further improvement of cycle stability, and achieve the effects of excellent cycle stability, improved electrical conductivity, and shortened reaction time.

Inactive Publication Date: 2020-03-13
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Guowei Huang et al. combined tungsten disulfide and three-dimensional graphene oxide (Huang G, Liu H, Wang S, et al. Hierarchical architecture of WS 2 Nanosheets on graphene frameworks with enhanced electrochemical properties for lithium storage and hydrogen evolution[J]

Method used

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  • Tungsten sulfide/CNTs (carbon nanotubes)-C composite electrode material and preparation method thereof
  • Tungsten sulfide/CNTs (carbon nanotubes)-C composite electrode material and preparation method thereof
  • Tungsten sulfide/CNTs (carbon nanotubes)-C composite electrode material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1: At room temperature, 40 mg of CNTs were added to 40 mL of ethanol solution and ultrasonicated for 2 h. The concentration was controlled to be 1 mg / mL, and the ultrasonic power was 1000 W to form suspension A with better dispersibility.

[0038] Step 2: Add 0.275 g of tungsten hexachloride and 0.5625 g of thioacetamide into suspension A, stirring at a speed of 800 r / min for 3 hours, and the obtained solution is solution B.

[0039] Step 3: Transfer the above solution B to a 100mL microwave hydrothermal kettle, control the filling ratio at 40%, then seal the hydrothermal kettle, put it into a high-throughput ultra-high pressure microwave digestion apparatus, and control the microwave hydrothermal temperature to be 200 ℃, the pressure is 2MPa, the reaction time is 0.5h, after the reaction is completed, it is naturally cooled to room temperature.

[0040] Step 4: Open the microwave reaction kettle, take out the product, wash it with absolute ethanol and deionized wa...

Embodiment 2

[0044] Step 1: Add 60 mg of CNTs to 30 mL of ethanol solution and sonicate for 2 h at room temperature, control the concentration to 2 mg / mL, and the ultrasonic power to 1000 W to form suspension A with better dispersibility.

[0045] Step 2: 0.55g of tungsten hexachloride and 1.125g of thioacetamide were added to suspension A, the stirring speed was 800r / min, and the mixture was stirred for 2h, and the obtained solution was solution B.

[0046] Step 3: Transfer the above solution B to a 100mL microwave hydrothermal kettle, control the filling ratio at 30%, then seal the hydrothermal kettle, put it into a high-throughput ultra-high pressure microwave digestion apparatus, and control the microwave hydrothermal temperature to be 220 ℃, the pressure is 3.5MPa, the reaction time is 2h, after the reaction is completed, it is naturally cooled to room temperature.

[0047] Step 4: Open the microwave reaction kettle, take out the product, wash it with absolute ethanol and deionized wa...

Embodiment 3

[0051] Step 1: At room temperature, 60 mg of CNTs were added to 60 mL of ethanol solution and ultrasonicated for 4 h. The concentration was controlled to be 1 mg / mL, and the ultrasonic power was 800 W to form suspension A with better dispersibility.

[0052] Step 2: 0.38g of tungsten hexachloride and 1.18g of thioacetamide were added to suspension A, the stirring speed was 800r / min, and the mixture was stirred for 1.5h, and the obtained solution was solution B.

[0053] Step 3: Transfer the above solution B to a microwave hydrothermal kettle, control the filling ratio at 60%, then seal the hydrothermal kettle, put it into a high-throughput ultra-high pressure microwave digestion apparatus, and control the microwave hydrothermal temperature to be 210 ° C , the pressure is 1MPa, the reaction time is 4h, and the reaction is naturally cooled to room temperature after the completion of the reaction.

[0054] Step 4: Open the microwave reactor, take out the product, wash it with abs...

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Abstract

The invention provides a tungsten sulfide/CNTs (at) C composite electrode material and a preparation method thereof. The preparation method comprises the following steps: adding CNTs into an ethanol solution, carrying out ultrasonic dispersion, adding tungsten hexachloride and thioacetamide, stirring, transferring into a microwave hydrothermal kettle, carrying out microwave hydrothermal reaction,and controlling the microwave hydrothermal temperature to be 200-220 DEG C, the pressure to be 0.5-5MPa and the reaction time to be 0.5-4h; washing and drying the reaction product to obtain a black WS2/CNTs composite material; dissolving sucrose in water, adding the WS2/CNTs composite material, stirring, freeze-drying to obtain a WS2/CNTs (at) C precursor, and calcining at 400-650 DEG C for 1-3 hours under the protection of argon atmosphere to obtain the WS2/CNTs (at) C composite material. The obtained composite electrode material has excellent cycling stability.

Description

technical field [0001] The present invention relates to WS 2 The technical field of nanomaterial preparation, specifically involving WS 2 / CNTs@C composite electrode material and preparation method thereof. Background technique [0002] Two-dimensional transition metal sulfides have a layered structure and exist in the form of X-M-X. The transition metal atoms separate the chalcogen atoms to form a sandwich structure to isolate them in two hexagonal space layered structures. The overall structures of the two-dimensional transition metal chalcogenides are all quadrilateral or hexagonal. WS 2 As a transition metal chalcogenide, it is a hexagonal graphene-like layered structure with large interlayer spacing. [0003] This unique layered structure and large interlayer spacing facilitate the insertion and extraction of sodium ions, making it a potential anode material for sodium ion batteries. However, there is a large volume expansion problem during the charging and disch...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/054
CPCH01M4/5815H01M4/625H01M4/628H01M10/054H01M2004/027Y02E60/10
Inventor 黄剑锋罗晓敏曹丽云李嘉胤王瑜航甘雨王芳敏王羽偲嘉
Owner SHAANXI UNIV OF SCI & TECH
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