Niobium pentoxide/carbon double-quantum-dot nanometer composite material, method for preparing same and application of niobium pentoxide/carbon double-quantum-dot nanometer composite material

A nanocomposite material, niobium pentoxide technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of poor actual capacity and cycle stability of materials, poor conductivity of materials, and easy structure damage. Destruction and other problems, to achieve the effect of controllable product morphology, short diffusion distance, and favorable infiltration

Active Publication Date: 2018-08-24
CENT SOUTH UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

But Nb 2 o 5 The conductivity of the material is poor, and the structure is easily destro

Method used

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  • Niobium pentoxide/carbon double-quantum-dot nanometer composite material, method for preparing same and application of niobium pentoxide/carbon double-quantum-dot nanometer composite material
  • Niobium pentoxide/carbon double-quantum-dot nanometer composite material, method for preparing same and application of niobium pentoxide/carbon double-quantum-dot nanometer composite material
  • Niobium pentoxide/carbon double-quantum-dot nanometer composite material, method for preparing same and application of niobium pentoxide/carbon double-quantum-dot nanometer composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0044]Take 3mmol of sucrose and dissolve it in 30ml of deionized water, and then perform ultrasonic operation to obtain a uniform clear and transparent solution, then put it in a furnace at 160°C for 3h. After the completion of the hydrothermal treatment, the obtained sample was ultrasonicated for 6 hours to obtain a uniform and stable tan solution, that is, a 1.2 mol / L carbon quantum dot solution.

[0045] Add niobium hydroxide and oxalic acid into 5 mL of deionized water at a molar ratio of 1:4.5, with a niobium ion concentration of 0.3 mol / L, and stir at 80°C until clear. Add 0.5 g of polyvinylpyrrolidone with an average molecular weight of 58,000 into the aforementioned solution, and stir until clear. Add 10mL of the previously prepared carbon quantum dot solution to the previously prepared solution, then add 15ml of isopropanol into the prepared mixed solution, mix well and transfer to a 50mL hydrothermal reaction kettle, and heat 12h. The resulting product was centrifu...

Embodiment 2

[0050] Take 1.5mmol of sucrose and dissolve it in 30ml of deionized water, and then perform ultrasonic operation to obtain a uniform clear and transparent solution, then put it in a furnace at 160°C for 3 hours. After the completion of the hydrothermal treatment, the obtained sample was ultrasonicated for 6 hours to obtain a uniform and stable tan solution, that is, a 0.6 mol / L carbon quantum dot solution.

[0051] Add niobium hydroxide and oxalic acid into 10 mL of deionized water at a molar ratio of 1:9, with a niobium ion concentration of 0.15 mol / L, and stir at 80°C until clear. Add 0.5 g of polyvinylpyrrolidone with an average molecular weight of 1,300,000 into the aforementioned solution, and stir until clear. Add 10mL of the previously prepared carbon quantum dot solution to the previously prepared solution, then add 10ml of isopropanol into the prepared mixed solution, mix well, transfer to a 50mL hydrothermal reaction kettle, and heat at 190°C for 6h . The resulting...

Embodiment 3

[0053] Take 2mmol of sucrose and dissolve it in 30ml of deionized water, and then perform ultrasonic operation to obtain a uniform clear and transparent solution, then put it in a furnace at 160°C for 3h. After the completion of the hydrothermal treatment, the obtained sample was ultrasonicated for 6 hours to obtain a uniform and stable tan solution, that is, a 0.8 mol / L carbon quantum dot solution.

[0054] Add niobium hydroxide and oxalic acid into 5 mL of deionized water at a molar ratio of 1:1, the concentration of niobium ions is 0.3 mol / L, and stir at 80°C until clear. Add 0.5 g of polyvinylpyrrolidone with an average molecular weight of 48,000 to the aforementioned solution, and stir until clear. Add 10mL of 0.5mol / L carbon quantum dot solution to the prepared aforementioned solution, then add 10ml of ethylene glycol into the prepared mixed solution, mix well and transfer to a 50mL hydrothermal reaction kettle, and water Heat for 10 hours. The resulting product was ce...

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Abstract

The invention discloses a niobium pentoxide/carbon double-quantum-dot nanometer composite material, a method for preparing the same and application of the niobium pentoxide/carbon double-quantum-dot nanometer composite material. The niobium pentoxide/carbon double-quantum-dot nanometer composite material comprises niobium pentoxide and carbon double quantum dot. The niobium pentoxide quantum dot and the carbon double quantum dot are closely bonded with each other; the mass fraction of the carbon quantum dot in the niobium pentoxide/carbon double-quantum-dot nanometer composite material is 20-40%. The niobium pentoxide/carbon double-quantum-dot nanometer composite material, the method and the application have the advantages that gaps are reserved between particles of the niobium pentoxide/carbon double quantum dots, and accordingly the niobium pentoxide/carbon double-quantum-dot nanometer composite material has large specific surface areas; the niobium pentoxide/carbon double-quantum-dot nanometer composite material with the structure is favorable for sufficient contact of electrolyte solution and active substances and further can effectively adapt to volume expansion of materials in charge and discharge procedures, and accordingly the electrochemical performance of the niobium pentoxide/carbon double-quantum-dot nanometer composite material can be greatly improved when the niobium pentoxide/carbon double-quantum-dot nanometer composite material is used as a negative electrode material for lithium ion batteries; precursors of niobium and carbon quantum dots are synthesized by the aid of hydrothermal processes at first and then are calcined in argon atmosphere to obtain the niobium pentoxide/carbon double-quantum-dot nanometer composite material; the method is convenientand easy to operate, reaction conditions can be controlled, and scale-up experiments can be facilitated.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery negative electrode material preparation, and in particular relates to a niobium pentoxide / carbon double quantum dot nanocomposite material, a preparation method thereof and an application in lithium ion batteries. Background technique [0002] Lithium-ion batteries have been used in more and more fields, such as electric vehicles, notebook computers, mobile phones, etc., due to their advantages such as high energy density, long cycle life, environmental friendliness and no pollution. In order to meet the better application of lithium-ion batteries, its anode materials have been extensively studied. Among them, transition metal oxides have received great attention because of their high theoretical specific capacity, abundant reserves, and mature preparation processes. In the study of transition metal oxide anode materials, lithium titanate (Li 4 Ti 5 o 12 ) and niobium oxide (Nb 2 ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/364H01M4/48H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 潘安强林建德
Owner CENT SOUTH UNIV
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