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A kind of niobium pentoxide/carbon double quantum dot nanocomposite material and its preparation method and application

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

Active Publication Date: 2021-01-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • 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 destroyed during the cycle, resulting in poor actual capacity and cycle stability of the material

Method used

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  • A kind of niobium pentoxide/carbon double quantum dot nanocomposite material and its preparation method and application
  • A kind of niobium pentoxide/carbon double quantum dot nanocomposite material and its preparation method and application
  • A kind of niobium pentoxide/carbon double quantum dot nanocomposite material and its preparation method and application

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 nanocomposite material, a preparation method and an application thereof. The composite material is composed of niobium pentoxide and carbon double quantum dots, and the niobium pentoxide quantum dots and carbon quantum dots are closely combined; the mass fraction of the carbon quantum dots in the composite material is 20-40% . There are gaps between the niobium pentoxide / carbon double quantum dot particles, and the specific surface area is relatively large. This structure is not only conducive to the full contact between the electrolyte and the active material, but also effectively adapts to the volume expansion of the material during charge and discharge, thereby greatly improving its electrochemical performance when used as a negative electrode material for lithium-ion batteries. In the invention, the precursors of niobium and carbon quantum dots are firstly synthesized by a hydrothermal method, and then calcined in an argon atmosphere to obtain a nanocomposite material of niobium pentoxide / carbon double quantum dots. The preparation method is easy to operate, the reaction conditions are controllable, and it is easy to scale up experiments.

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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Patent Type & Authority Patents(China)
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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