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Nanosheet TiO2 material, preparation method and application thereof

A technology of nanosheets and hydrolysis reaction, which is applied in the direction of nanotechnology, titanium oxide/hydroxide, electrical components, etc., can solve the problems of limited practical application, low conductivity lithium ion diffusion rate, etc., to improve electrochemical performance, shorten The effect of transmission distance and reduction of calcination time

Inactive Publication Date: 2018-10-02
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the material's low electrical conductivity and lithium ion diffusion rate also limit its practical application in high-power batteries.

Method used

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  • Nanosheet TiO2 material, preparation method and application thereof
  • Nanosheet TiO2 material, preparation method and application thereof
  • Nanosheet TiO2 material, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 1) Add 5 mL of butyl titanate to 10 mol / L NaOH solution, and stir rapidly on a magnetic stirrer to disperse the solution evenly. After stirring for 20 min, the white emulsion was transferred to a 100 mL polytetrafluoroethylene reactor, and reacted continuously at 180° C. for 20 h to completely hydrolyze it.

[0030] 2) Add the emulsion obtained in step 1) to the prepared 0.2mol / L dilute hydrochloric acid solution, stir rapidly for 10h, and fully pickle to remove the residual Na on the surface + . Then the above solution was filtered, washed 8 times with deionized water, and then dried in a drying oven at a drying temperature of 50° C. and a drying time of 22 hours.

[0031] 3) The white powder obtained by calcining the dried powder at 450 °C for 4 h in the air atmosphere is the prepared nanosheet TiO 2 Material.

[0032] From figure 1 In the two FE-SEM figures, we can see that we have synthesized nanosheet TiO through the experimental conditions of Example 1 2 mate...

Embodiment 2

[0034] 1) Add 5 mL of butyl titanate to 10 mol / L NaOH solution, and stir rapidly on a magnetic stirrer to disperse the solution evenly. After stirring for 20 min, the white emulsion was transferred to a 100 mL polytetrafluoroethylene reactor, and reacted continuously at 150° C. for 24 h to completely hydrolyze it.

[0035] 2) Add the emulsion obtained in step 1) to the prepared 0.1mol / L dilute hydrochloric acid solution, stir rapidly for 10h, and fully pickle to remove the residual Na on the surface + . Then the above solution was filtered, washed with deionized water for 5 times, and then dried in a drying oven at a drying temperature of 60° C. and a drying time of 20 h.

[0036] Step 3) The white powder obtained after calcining the dried powder at 400°C for 4 hours in an air atmosphere is nanosheet TiO 2 Material.

[0037] figure 2 TiO 2 From the XRD pattern of the material, it can be found that the diffraction peaks appearing at 14.18°, 24.96°, 28.62°, and 48.44° corr...

Embodiment 3

[0039] 1) Add 5 mL of butyl titanate to 8 mol / L NaOH solution, and stir rapidly on a magnetic stirrer to disperse the solution evenly. After stirring for 20 min, the white emulsion was transferred to a 100 mL polytetrafluoroethylene reactor, and reacted continuously at 200° C. for 15 h to completely hydrolyze it.

[0040] 2) Add the emulsion obtained in step 1) to the prepared 0.5mol / L dilute hydrochloric acid solution, stir rapidly for 10h, and fully pickle to remove the residual Na on the surface + . Then the above solution was filtered, washed 10 times with deionized water, and then dried in a drying oven at a drying temperature of 70° C. and a drying time of 20 h.

[0041] 3) The white powder obtained by calcining the dried powder at 600 °C for 3 h in an air atmosphere is the prepared nanosheet TiO 2 Material.

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Abstract

The invention provides a nanosheet TiO2 material, a preparation method and application thereof. The method specifically comprises the steps of: adding 5ml of a titanium source compound into a 8-10mol / L NaOH solution, performing stirring, and carrying out hydrolysis reaction; adding the reaction product into a dilute hydrochloric acid solution, conducting rapid stirring to remove the surface residual Na<+>; and calcining the dried titanic acid compound powder in the air to obtain the nanosheet TiO2 material. According to the invention, the titanic acid compound is prepared through hydrolysis ofthe titanium source compound and the subsequent ion exchange reaction, and the follow-up calcination reaction is carried out to obtain a nanosheet TiO2 negative electrode material. The material has alarge specific surface area, can be used as a lithium ion battery negative electrode material, makes up for the shortcomings of poor conductivity and lithium-ion diffusion rate of TiO2 material, andimproves the electrochemical performance of the material.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a nanosheet TiO 2 Materials and their preparation methods and applications. Background technique [0002] Lithium-ion batteries have become the first choice for new energy vehicle power batteries because of their long cycle life, high working voltage, high energy density, and environmental protection. They have very important and broad prospects. Among them, negative electrode materials, as the core components of lithium-ion batteries, have always been valued by people, and how to improve the electrochemical performance of negative electrode materials is of great significance to realize the large-scale application of lithium-ion power batteries. [0003] The negative electrode materials of lithium-ion batteries mainly include metallic lithium, graphitized carbon materials, amorphous carbon materials, nitrides, silicon-based materials, tin-bas...

Claims

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Application Information

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IPC IPC(8): C01G23/047H01M4/48H01M10/0525B82Y40/00
CPCB82Y40/00C01G23/047C01P2004/20H01M4/483H01M10/0525Y02E60/10
Inventor 张阳阳樊少娟夏昕
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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