Three-dimensional hollow titanium dioxide assembled from (001) surfaces, and preparation method and application thereof

A titanium dioxide and hollow technology, which is applied in the field of lithium battery cathode material manufacturing, can solve the problems of inability to exert the advantages of high-energy crystal planes, reduce the effective exposure rate of high-energy crystal planes, and overlap between sheets, so as to improve the charging and discharging efficiency, the reaction is mild, the Simple process effect

Inactive Publication Date: 2015-12-09
PEOPLES LIBERATION ARMY ORDNANCE ENG COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the TiO mentioned in the above report 2 Most of them are two-dimensional flakes or microspheres formed by agglomeration of flakes. This flake structure itself has certain disadvantages. For example, the flakes are easy to partially overlap, thereby reducing the effective exposure rate of the (001) high-energy crystal plane as a whole. Therefore, the advantages of high-energy crystal planes cannot be used

Method used

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  • Three-dimensional hollow titanium dioxide assembled from (001) surfaces, and preparation method and application thereof
  • Three-dimensional hollow titanium dioxide assembled from (001) surfaces, and preparation method and application thereof
  • Three-dimensional hollow titanium dioxide assembled from (001) surfaces, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) measure 0.1ml mass percentage as 40% hydrofluoric acid, mix with 3ml mass percentage as 35% hydrogen peroxide solution;

[0047] (2) weigh 0.02 gram of titanium metal powder, drop into the mixed solution of step (1) gained;

[0048] (3) Measure 27ml of deionized water, mix it further with the solution obtained in step (2), put it into a hydrothermal reaction kettle, react at 180°C for 2 hours, wash and dry with deionized water and ethanol;

[0049] (4) Calcining the dried product after step (3), keeping the sintering temperature at 450° C. for 3 hours, and cooling to room temperature to obtain the three-dimensional hollow titanium dioxide assembled by (001) planes.

Embodiment 2

[0051] (1) measure 0.2ml mass percentage as 42% hydrofluoric acid, mix with 5ml mass percentage as 33% hydrogen peroxide solution;

[0052] (2) weigh 0.06 gram of metal titanium powder, drop into the mixed solution of step (1) gained;

[0053] (3) Measure 54ml of deionized water, mix it further with the solution obtained in step (2), put it into a hydrothermal reaction kettle, react at 180°C for 4 hours, wash and dry with deionized water and ethanol;

[0054] (4) Calcining the dried product after step (3), keeping the sintering temperature at 450° C. for 2 hours, and cooling to room temperature to obtain the three-dimensional hollow titanium dioxide assembled by (001) planes.

Embodiment 3

[0056] (1) measure 0.5ml mass percentage as 44% hydrofluoric acid, mix with 16ml mass percentage as 31% hydrogen peroxide solution;

[0057] (2) weigh 0.12 gram of titanium metal powder, drop into the mixed solution of step (1) gained;

[0058] (3) Measure 140ml of deionized water, mix it further with the solution obtained in step (2), put it into a hydrothermal reaction kettle, react at 180°C for 8 hours, wash and dry with deionized water and ethanol;

[0059] (4) Calcining the dried product after step (3), keeping the sintering temperature at 450° C. for 1.5 hours, and cooling to room temperature to obtain the three-dimensional hollow titanium dioxide assembled by (001) planes.

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Abstract

The invention discloses a three-dimensional hollow titanium dioxide assembled from (001) surfaces, and a preparation method and application thereof. The three-dimensional hollow titanium dioxide can be applied to the field of manufacturing of positive electrode materials of lithium batteries. According to the invention, a hydro-thermal method is employed for preparation of titanium dioxide, and under the co-action of hydrofluoric acid and hydrogen peroxide, the hydrolysis process of a reaction intermediate peroxotitanic acid is effectively regulated and controlled. The formation process of a hollow structure is related to an Ostwald ripening mechanism, fluoride ions promote preferential growth of a crystal along [001] direction, and finally, the three-dimensional hollow product is formed. The method has the advantages of low cost, simple and controllable process, mild reaction, obtainment of the pure product and a high exposure rate of the (001) surfaces; and the titanium dioxide material prepared by using the method has the high-exposure (001) surfaces, is of a hollow micro-nano structure, can be applied to preparation of positive pole pieces of the lithium battery, shortens a diffusion path of lithium ions, facilitates intercalation/deintercalation behavior of lithium ions and alleviates volume expansion of the material during charging and discharging, and thus, the lithium battery has improved charging and discharging efficiency and prolonged cycle life.

Description

technical field [0001] The invention relates to a titanium dioxide and a preparation method thereof, in particular to a three-dimensional hollow titanium dioxide assembled from (001) planes, a preparation method and application thereof, which can be used in the field of lithium battery cathode material manufacturing. Background technique [0002] With the rapid development of society and the increasing demand for energy, human beings have caused serious pollution and damage to the natural environment. At present, primary energy (fossil energy such as coal, oil and natural gas) occupies a dominant position in the energy structure. However, this fossil energy is a non-renewable resource and is facing the danger of being exhausted soon. At the same time, the mining, transportation and use of fossil energy will also cause serious environmental pollution problems. Therefore, it is imperative to develop new renewable clean energy sources (solar energy, wind energy, geothermal ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/16C30B7/10C30B29/66H01M4/48B82Y30/00
CPCY02E60/10
Inventor 王小亮孙宏宇王庆国白丽云王平平曲兆明
Owner PEOPLES LIBERATION ARMY ORDNANCE ENG COLLEGE
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