Preparation method and application for nanosheet formed by carbon-coated titanium dioxide nanotube

A titanium dioxide and nanotube technology is applied in the field of preparation of electrode materials for lithium ion batteries, which can solve problems such as unfavorable industrial production, poor repeatability, and complicated experimental procedures, and achieve the effects of good electrochemical performance, low cost, and simple operation.

Active Publication Date: 2016-02-24
KUNMING UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

However, the experimental process of these traditional methods is complicated

Method used

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  • Preparation method and application for nanosheet formed by carbon-coated titanium dioxide nanotube
  • Preparation method and application for nanosheet formed by carbon-coated titanium dioxide nanotube
  • Preparation method and application for nanosheet formed by carbon-coated titanium dioxide nanotube

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[0029] Example 1

[0030] (1) Cut the pure titanium sheet into 3cm×8cm titanium sheets, and sonicate them in acetone, absolute ethanol, and distilled water at 25kHz for 15min respectively to remove the grease on the surface of the pure titanium sheet to obtain a clean pure titanium sheet. Put the clean pure titanium flakes and 1.2mol / L sodium hydroxide solution into a 100ml reactor at a ratio of 80g / L, react at 200℃ for 24h, take it out, and soak in 0.5mol / L dilute hydrochloric acid solution for 3h Afterwards, they were taken out, washed with distilled water and alcohol for 3 times, and finally annealed in the air at 500°C for 3 hours to obtain nanosheets composed of titanium dioxide nanotubes.

[0031] (2) Put the nanosheets composed of titanium dioxide nanotubes prepared in step (1) and 0.03mol / L glucose solution into a 100ml reactor at a ratio of 5g / L, and react at 180℃ for 18h, and then In an argon atmosphere, the temperature was raised to 480°C at 10°C / min, and after carboniz...

Example Embodiment

[0035] Example 2

[0036] (1) Cut the pure titanium sheet into 3cm×8cm titanium sheets, and sonicate them in acetone, absolute ethanol, and distilled water at 25kHz for 18 minutes to remove the grease on the surface of the pure titanium sheet to obtain a clean pure titanium sheet. Put the clean pure titanium flakes together with 1.6mol / L potassium hydroxide solution into a 100ml reactor at a ratio of 100g / L, react at 210℃ for 18h, take it out, and soak in 0.3mol / L dilute hydrochloric acid solution for 2h It was then taken out, washed with distilled water and alcohol for 3 times, and finally annealed in the air at 600°C for 4 hours to obtain nanosheets composed of titanium dioxide nanotubes.

[0037] (2) Put the nanosheets composed of titanium dioxide nanotubes prepared in step (1) and 0.01mol / L glucose solution into a 100ml reactor at the ratio of 1.8g / L, and react at 185℃ for 24h, then The temperature was raised to 490°C at 13°C / min in an argon atmosphere, and after carbonization...

Example Embodiment

[0040] Example 3

[0041] (1) Cut the pure titanium sheet into 3cm×8cm titanium sheets, and sonicate them in acetone, absolute ethanol, and distilled water at 25kHz for 20 minutes respectively to remove the grease on the surface of the pure titanium sheet to obtain a clean pure titanium sheet. 48g / L ratio Put clean pure titanium flakes and 1.8mol / L sodium hydroxide solution into a 100ml reactor, react at 220℃ for 12h, take it out, and soak in 0.6mol / L dilute hydrochloric acid solution for 4h Afterwards, they were taken out, washed with distilled water and alcohol for 3 times, and finally annealed in the air at 700°C for 2 hours to obtain nanosheets composed of titanium dioxide nanotubes.

[0042] (2) Put the nanosheets composed of titanium dioxide nanotubes prepared in step (1) and 0.05mol / L glucose solution into a 100ml reactor at a ratio of 9g / L, and react at 190℃ for 20h, and then In an argon atmosphere, the temperature is raised to 500°C at 15°C / min, and after carbonization is...

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Abstract

The invention relates to a preparation method and an application for a nanosheet formed by a carbon-coated titanium dioxide nanotube, and belongs to the technical field of lithium ion battery electrode material preparation. The preparation method comprises the steps of preparing the nanosheet formed by the titanium dioxide nanotube firstly; then performing a hydrothermal reaction between the nanosheet formed by the titanium dioxide nanotube and a glucose solution, and performing carbonization to obtain the nanosheet formed by the carbon-coated titanium dioxide nanotube; makingthe nanosheet formed by the carbon-coated titanium dioxide nanotube react with a potassium permanganate solution to obtain the manganese dioxidecoated nanosheet formed by the carbon-coated titanium dioxide nanotube; performing a hydrothermal reaction between the manganese dioxidecoated nanosheet formed by the carbon-coated titanium dioxide nanotube and a ferric salt-containing solution, and then performing annealing to obtain the nanosheet formed by the carbon-coated titanium dioxide nanotube loaded with iron trioxide. The nanosheet prepared by the invention is used as the lithium battery positive electrode material for assembling batteries and the prepared lithium ion battery is relatively high in the specific discharge capacity.

Description

technical field [0001] The invention relates to a preparation method and application of nanosheets composed of carbon-coated titanium dioxide nanotubes, and belongs to the technical field of lithium ion battery electrode material preparation. Background technique [0002] Due to the continuous consumption of fossil fuels mainly oil and coal, as well as the continuous aggravation of environmental pollution. More and more people are turning their attention to new energy technologies, and lithium batteries are one of the important directions. However, due to the low lithium intercalation voltage of commercial graphite batteries, lithium dendrites are easy to form, which will cause serious safety problems. Due to its good structural stability and abundant content in nature, titanium dioxide has become one of the new negative electrode materials for lithium-ion batteries that can potentially replace traditional graphite electrodes. [0003] However, because titanium dioxide is ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525B82Y40/00
CPCB82Y40/00H01M4/366H01M4/485H01M4/525H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 刘建雄罗建刚
Owner KUNMING UNIV OF SCI & TECH
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