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A kind of porous structure lithium titanate and its preparation method and application

A technology of structural lithium titanate and porous structure, which is applied in the preparation of environmental protection materials and energy fields, can solve the problems of less synthesis reports, etc., and achieve the effects of easy control of process parameters, increased specific surface area, and simple preparation process.

Active Publication Date: 2021-01-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few reports on the synthesis of lithium titanate materials with porous structures.

Method used

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  • A kind of porous structure lithium titanate and its preparation method and application
  • A kind of porous structure lithium titanate and its preparation method and application
  • A kind of porous structure lithium titanate and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0072]according tofigure 1 In the process, firstly, hydrogen peroxide and lithium hydroxide are dissolved in water to form an aqueous solution with a lithium hydroxide concentration of 0.6 mole per liter and a hydrogen peroxide volume fraction of 2%. Under stirring conditions, slowly add 2 g of tetrabutyl titanate to the above 100 ml aqueous solution, and stir to form a yellow transparent solution. Subsequently, the yellow transparent solution was heated to 70 degrees Celsius and stirred at constant temperature for 6 hours to stop the reaction to obtain a white solid. Subsequently, the white solid was separated by centrifugation, the moisture content of the separated solid was about 58%, and then it was put into an oven and vacuumed at 60 degrees Celsius for drying. Subsequently, the above-mentioned dried sample was placed in an oven at 200 degrees Celsius for thermostatic treatment for 20 hours to completely remove the hydrogen peroxide adsorbed and contained in the white solid. Su...

Embodiment 2

[0074]First, hydrogen peroxide and lithium hydroxide are dissolved in water to form an aqueous solution with a lithium hydroxide concentration of 0.45 moles per liter and a hydrogen peroxide volume fraction of 1%. Under stirring conditions, slowly add 0.2 g of titanium sulfate to the above 100 ml aqueous solution, and stir to form a yellow transparent solution. Subsequently, the yellow transparent solution was heated to 60 degrees Celsius and stirred at constant temperature for 24 hours to stop the reaction to obtain a white solid. Subsequently, the white solid was separated by filtration, the moisture content of the separated solid was about 55%, and then it was put in an oven and vacuumed at 50 degrees Celsius for drying. Subsequently, the above-mentioned dried white solid was placed in an oven at 150 degrees Celsius for constant temperature annealing for 24 hours to completely remove the hydrogen peroxide adsorbed and contained in the white solid. Subsequently, the white solid fr...

Embodiment 3

[0076]First, hydrogen peroxide and lithium hydroxide are dissolved in water to form an aqueous solution with a lithium hydroxide concentration of 0.8 mole per liter and a 5% hydrogen peroxide volume fraction. Under stirring conditions, slowly add 5 g of titanium isopropoxide to the above 100 ml aqueous solution, and stir to form a yellow transparent solution. Subsequently, the yellow transparent solution was heated to 98 degrees Celsius and stirred at constant temperature for 2 hours to stop the reaction to obtain a white solid. Subsequently, the white solid is separated by suction filtration, and the separated solid has a water content of about 50%, and then it is placed in an oven and vacuum dried at 70 degrees Celsius. Subsequently, the dried white solid was placed in an oven at 250 degrees Celsius for constant temperature annealing for 2 hours to completely remove the hydrogen peroxide adsorbed and contained in the white solid. Subsequently, the white solid from which hydrogen p...

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Abstract

The invention provides a lithium titanate with a porous structure and a preparation method and application thereof. The preparation method includes the following steps: S1, dispersing the titanium source in an aqueous hydrogen peroxide solution containing lithium hydroxide to obtain a dispersion; S2, heating and reacting the dispersion obtained in step S1 to obtain a precursor; S3, dispersing the titanium source in step S2 Separating and drying the obtained precursor; S4, performing low-temperature annealing on the dried precursor; S5, performing high-temperature annealing on the precursor subjected to low-temperature annealing in step S4 to obtain porous structure lithium titanate. The method of the invention can prepare the linear porous structure, the porous structure in which linear and regular particles coexist, and the lithium titanate in the regular particle porous structure, which cannot be realized by other methods.

Description

Technical field[0001]The invention relates to the field of preparation of energy and environmental protection materials. Specifically, the invention relates to a porous structure lithium titanate and a preparation method and application thereof.Background technique[0002]Lithium titanate is an ideal and promising anode material for lithium-ion batteries, and its charge-discharge cycle can reach thousands of times. The size and morphology of lithium titanate can affect its application in lithium-ion batteries to a large extent. For example, the porous structure material has a large specific surface area and high porosity, so that it has many excellent characteristics in application. Preparation of lithium titanate into a porous structure has the following advantages: (1) The porous structure can increase the specific surface area of ​​the material, expand the contact area between the electrode and the electrolyte, reduce the current density, and increase the charge and discharge rate;...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/00H01M4/485H01M10/0525H01M10/054
CPCC01G23/005C01P2002/32C01P2002/72C01P2004/03C01P2006/17C01P2006/40H01M4/485H01M10/0525H01M10/054Y02E60/10
Inventor 李建明金旭刘晓丹王晓琦焦航孙亮
Owner PETROCHINA CO LTD
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