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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the experimental process of these traditional methods is complicated and the repeatability is poor, which is not conducive to industrial production.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Cut the pure titanium sheet into 3cm×8cm titanium sheet, ultrasonically vibrate in acetone, absolute ethanol, and distilled water at 25kHz for 15min respectively, remove the grease on the surface of the pure titanium sheet, and obtain a clean pure titanium sheet, press The ratio of 80g / L put the clean pure titanium sheet together with 1.2mol / L sodium hydroxide solution into a 100ml reaction kettle, take it out after reacting at 200°C for 24h, and soak it in 0.5mol / L dilute hydrochloric acid solution for 3h Then take it out, wash with distilled water and alcohol three times respectively, and finally anneal at 500° C. in air 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, react at 180°C for 18h, and then In an argon atmosphere, the temperature was raised to 480° C. at 10° C. / min, an...

Embodiment 2

[0036](1) Cut the pure titanium sheet into 3cm×8cm titanium sheet, ultrasonically vibrate in acetone, absolute ethanol, and distilled water at 25kHz for 18min respectively, remove the grease on the surface of the pure titanium sheet, and obtain a clean pure titanium sheet, press The ratio of 100g / L put the clean pure titanium sheet together with 1.6mol / L potassium hydroxide solution into a 100ml reaction kettle, take it out after reacting at 210°C for 18h, and soak it in 0.3mol / L dilute hydrochloric acid solution for 2h Then take it out, wash with distilled water and alcohol three times, and finally anneal at 600° C. in air 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 a ratio of 1.8g / L, react at 185°C for 24h, and then In an argon atmosphere, the temperature was raised to 490° C. at 13° C. / min, and after ...

Embodiment 3

[0041] (1) Cut the pure titanium sheet into 3cm×8cm titanium sheet, and ultrasonically vibrate in acetone, absolute ethanol, and distilled water at 25kHz for 20min respectively to remove the grease on the surface of the pure titanium sheet to obtain a clean pure titanium sheet, press The ratio of 48g / L put the clean pure titanium sheet together with 1.8mol / L sodium hydroxide solution into a 100ml reaction kettle, take it out after reacting at 220°C for 12h, and soak it in 0.6mol / L dilute hydrochloric acid solution for 4h Then take it out, wash with distilled water and alcohol three times, and finally anneal at 700° C. in air 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, react at 190°C for 20h, and then In an argon atmosphere, the temperature was raised to 500° C. at 15° C. / min, and after c...

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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
CPCH01M4/366H01M4/485H01M4/525H01M4/625H01M10/0525B82Y40/00H01M2004/021Y02E60/10
Inventor 刘建雄罗建刚
Owner KUNMING UNIV OF SCI & TECH
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