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Oxygen-vacancy-rich titanium dioxide material, preparation and application of oxygen-vacancy-rich titanium dioxide material in lithium oxygen battery

A technology of titanium dioxide and vacancies, which is applied in the direction of battery electrodes, circuits, electrical components, etc., to achieve the effect of improving cycle stability, improving stability, and simple operation process

Active Publication Date: 2021-09-07
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a lack of cathode catalysts for lithium-air batteries with excellent catalytic performance in the prior art.

Method used

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  • Oxygen-vacancy-rich titanium dioxide material, preparation and application of oxygen-vacancy-rich titanium dioxide material in lithium oxygen battery
  • Oxygen-vacancy-rich titanium dioxide material, preparation and application of oxygen-vacancy-rich titanium dioxide material in lithium oxygen battery
  • Oxygen-vacancy-rich titanium dioxide material, preparation and application of oxygen-vacancy-rich titanium dioxide material in lithium oxygen battery

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preparation example Construction

[0032] An embodiment of the present invention provides a method for preparing an oxygen-vacancy titanium dioxide material, comprising the following steps:

[0033] S1, placing a tubular electrode above the titanium salt solution, the distance from the lower end of the tubular metal electrode to the liquid surface is 0.1-10 mm, preferably 2-5 mm, and the optimal power of the plasma arc can be guaranteed within this distance. Place the sheet electrode in the titanium salt solution.

[0034] S2, the inert gas is continuously blown towards the liquid surface through the tubular electrode; the gas flow is controlled by the glass rotameter in order to obtain the plasma with the highest efficiency and the best arc performance. In this embodiment, the flow rate of the inert gas is preferably 45-55 sccm; the inert protective gas is preferably Ar.

[0035] S3, connect the tubular electrode and the sheet electrode to a high-voltage DC power supply, and control the voltage to generate pl...

Embodiment 1

[0048] Preparation of Oxygen-Vacancy-Rich Titanium Dioxide Material:

[0049] (1) Dissolve titanium chloride into water, and configure 50mL of 5mM solution;

[0050] (2) Take a 10cm tungsten tube with an inner diameter of 2mm and an outer diameter of 5mm as the A electrode, and the distance from its lower end to the liquid surface is about 2mm;

[0051] (3) Place a graphite sheet with a length of 10 cm, a width of 1 cm, and a thickness of 0.5 cm in the solution as the B electrode, according to the attached figure 1 Build a simple electrochemical reaction device and keep the minimum distance between the tungsten tube electrode and the graphite sheet electrode at 10cm;

[0052] (4) The inert gas Ar is continuously fed into the liquid surface direction through the tubular A electrode, and the glass rotameter controls the gas flow rate to 50 sccm;

[0053] (5) Connect the tungsten tube electrode and the graphite electrode to a high-voltage DC power supply, and control the voltag...

Embodiment 2

[0057] Preparation of Oxygen-Vacancy-Rich Titanium Dioxide Material:

[0058] (1) Dissolve titanium nitrate in water and configure 50mL of 5mM solution;

[0059] (2) Take a 10cm tungsten tube with an inner diameter of 2mm and an outer diameter of 5mm as the A electrode, and the distance from its lower end to the liquid surface is about 2mm;

[0060] (3) Place a tungsten sheet with a length of 10 cm, a width of 1 cm, and a thickness of 0.5 cm in the solution as the B electrode. figure 1 Build a simple electrochemical reaction device and keep the minimum distance between the tungsten tube electrode and the graphite sheet electrode at 5cm;

[0061] (4) The inert gas Ar is continuously fed into the liquid surface direction through the tubular A electrode, and the glass rotameter controls the gas flow rate to 50 sccm;

[0062] (5) Connect the tungsten tube electrode and the graphite electrode to a high-voltage DC power supply, and control the voltage to 1000V through a regulated ...

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Abstract

The invention provides an oxygen-vacancy-rich titanium dioxide material, preparation and an application thereof in a lithium-oxygen battery, the preparation comprises the following steps: S1, a tubular electrode is placed above a titanium salt solution, and the distance between the lower end of the tubular metal electrode and the liquid level is 0.1-10 mm; a sheet electrode is placed in the titanium salt solution; S2, inert gas is continuously blown out in the liquid level direction through the tubular electrode; and S3, the tubular electrode and the sheet electrode are connected with a high-voltage direct-current power supply, and plasma is generated between the lower end of the tubular electrode and the liquid level by controlling voltage; and voltage stable discharge is kept for a period of time, and a precipitation product is collected at the bottom of the liquid, namely the oxygen-vacancy-enriched titanium dioxide material. The material can reduce the overpotential of the lithium-air battery in the charge-discharge process and improve the cycling stability of the lithium-air battery.

Description

technical field [0001] The invention relates to a titanium dioxide material rich in oxygen vacancies, its preparation and its application in lithium-oxygen batteries, belonging to the technical field of lithium-air batteries. Background technique [0002] Lithium-oxygen battery, also known as lithium-air battery, is a battery that uses lithium as the anode and oxygen in the air as the cathode reactant. Li-air batteries have a very high theoretical specific capacity (~3600Wh kg -1 ,), considered the holy grail of secondary batteries. Its energy density (energy density refers to the energy stored in a battery per unit mass) is about 10 times that of lithium-ion batteries, making it one of the chemical batteries with the highest energy density in theory. In addition, it shows good application prospects because of its environmental friendliness and reversibility. [0003] However, there are still many bottlenecks in the practical application of lithium-air batteries that need...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J35/10H01M4/90
CPCB01J21/063H01M4/9016H01M2004/8689B01J35/33B01J35/60Y02E60/50Y02E60/10
Inventor 岳光辉杨天伦吴园慧丁浩然夏永吉
Owner XIAMEN UNIV
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