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Rose-shaped vanadium disulfide/carbon quantum-dot composite material and preparation method and application thereof

A technology of carbon quantum dots and vanadium disulfide, which is applied to a composite material with rose-shaped vanadium disulfide/carbon quantum dots and its preparation, and the application field of sodium ion batteries, which can solve the problem of capacity decay, poor rate performance, and volume change. and structural collapse, etc., to achieve the effect of short diffusion distance, many active sites, and special structure.

Active Publication Date: 2018-09-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the practical use of bulk metal sulfides is due to the slow ion / electron transport kinetics, large volume changes and structural collapse during repeated lithiation, resulting in severe pulverization and unstable solid electrolyte interface (SEI) Repeated film formation leading to capacity fading and poor rate performance

Method used

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  • Rose-shaped vanadium disulfide/carbon quantum-dot composite material and preparation method and application thereof
  • Rose-shaped vanadium disulfide/carbon quantum-dot composite material and preparation method and application thereof
  • Rose-shaped vanadium disulfide/carbon quantum-dot composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Add 1.0g of sodium hydroxide to a mixed solution of 10ml of deionized water and 150ml of ethanol, use a three-way high-precision regulated power supply produced by Shenzhen Dingyang Technology Co., Ltd. for electrolysis, set the voltage at 20V, and electrolysis for 20 hours. The electrolyzed solution was dialyzed and evaporated to dryness at 70°C. That is, carbon quantum dots are obtained.

[0050] Add 2 mmol of ammonium metavanadate and 16 mmol of thioacetamide into 30 mL of deionized water, and stir until uniform at room temperature. Add 0.5 g of polyvinylpyrrolidone with a molecular weight of 48,000 and 0.5 g of carbon quantum dots into the aforementioned solution, and stir until uniform to obtain a mixed solution A. Add 5mL of ethylene glycol into the mixed solution A, mix well to obtain the mixed solution B, transfer the mixed solution B to a 50mL hydrothermal reaction kettle, and conduct a hydrothermal reaction at 180°C for 12h. Then centrifuge to obtain solid p...

Embodiment 2

[0054] Add 1.0g of lithium hydroxide to a mixed solution of 10ml of deionized water and 150ml of ethanol, use a three-way high-precision regulated power supply produced by Shenzhen Dingyang Technology Co., Ltd. for electrolysis, set the voltage at 15V, and electrolysis for 28 hours. The electrolyzed solution was dialyzed and evaporated to dryness at 70°C. That is, carbon quantum dots are obtained.

[0055] Add 2 mmol of potassium metavanadate and 20 mmol of thioacetamide into 30 mL of deionized water, and stir until uniform at room temperature. 0.5 g of polyvinylpyrrolidone with a molecular weight of 48,000 and 0.8 g of carbon quantum dots were added to the aforementioned solution, and stirred until uniform to obtain a mixed solution A. Add 10mL of ethylene glycol into the mixed solution A and mix evenly to obtain the mixed solution B, transfer the mixed solution B to a 50mL hydrothermal reaction kettle, and conduct a hydrothermal reaction at 180°C for 20h. Then centrifuged ...

Embodiment 3

[0057] Add 2.0g of sodium hydroxide to a mixed solution of 10ml of deionized water and 180ml of ethanol, use a three-way high-precision regulated power supply produced by Shenzhen Dingyang Technology Co., Ltd. for electrolysis, set the voltage at 15V, and electrolysis for 28 hours. The electrolyzed solution was dialyzed and evaporated to dryness at 90°C. That is, carbon quantum dots are obtained.

[0058] Add 2 mmol of sodium orthovanadate and 10 mmol of thioacetamide into 20 mL of deionized water, and stir until uniform at room temperature. 0.5 g of polyvinylpyrrolidone with a molecular weight of 48,000 and 0.8 g of carbon quantum dots were added to the aforementioned solution, and stirred until uniform to obtain a mixed solution A. Add 15mL of isopropanol to the mixed solution A and mix evenly to obtain the mixed solution B, transfer the mixed solution B to a 50mL hydrothermal reaction kettle, and conduct a hydrothermal reaction at 180°C for 36h. Then centrifuge to obtain ...

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Abstract

The invention discloses a rose-shaped vanadium disulfide / carbon quantum-dot composite material and preparation method and application thereof. The composite material comprises vanadium disulfide / carbon quantum-dot microflowers, wherein the microflowers are in rose shapes, an arbitrary microflower comprises n nanosheets, n is more than or equal to 6, and carbon quantum dots are uniformly distributed in the nanosheets. A multi-layer structure formed by assembling the nanosheets is beneficial for full contact between an electrolyte and an active substance, the carbon quantum dots are uniformly distributed in the nanosheets, a certain buffer effect on volume expansion of the material during the charge-discharge process is achieved, so that the electrochemical performance of the material when used as a sodium ion battery negative electrode material is greatly improved. The preparation method is convenient and easy to operate by taking a hydrothermal method as foundation and is controllablein reaction condition, and experiment is easy to amplify.

Description

technical field [0001] The invention belongs to the technical field of preparation of negative electrode materials for sodium ion batteries, and in particular relates to a rose-like vanadium disulfide / carbon quantum dot composite material, a preparation method thereof and an application in sodium ion batteries. Background technique [0002] In recent years, with the vigorous development of lithium-ion batteries, scientists are increasingly concerned about the shortcomings of low lithium content and uneven distribution, especially when batteries will be used in large-scale green grid energy storage, making existing batteries in large Progress in large-scale grid energy storage has been slow. Sodium is rich in content, especially widely distributed globally (the content of metal elements in the earth's crust ranks fourth, and it is abundant in seawater), and has very similar physical and chemical properties to lithium. The theoretical specific capacity of sodium is 1165mAh g ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/136
CPCH01M4/136H01M4/362Y02E60/10
Inventor 潘安强林建德
Owner CENT SOUTH UNIV
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