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Lithium titanate of porous structure as well as preparation method and application thereof

A technology of structural lithium titanate and porous structure, applied in the directions of titanate, structural parts, alkali metal titanate, etc., can solve the problem of few synthetic reports, and achieve easy control of process parameters, effective migration, and easy large-scale The effect of industrial production

Active Publication Date: 2019-02-12
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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  • Lithium titanate of porous structure as well as preparation method and application thereof
  • Lithium titanate of porous structure as well as preparation method and application thereof
  • Lithium titanate of porous structure as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0072] according to figure 1 Process, first, hydrogen peroxide and lithium hydroxide are dissolved in water to form an aqueous solution with a concentration of lithium hydroxide of 0.6 moles per liter and a volume fraction of hydrogen peroxide of 2%. Under the condition of stirring, slowly add 2 grams of tetrabutyl titanate into the above 100 ml aqueous solution, and stir to form a yellow transparent solution. Subsequently, the above-mentioned 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 above-mentioned white solid was separated by centrifugation, and the moisture content of the separated solid was about 58%, and then put into an oven, and dried under vacuum at 60 degrees Celsius. Subsequently, the above dried sample was placed in an oven at 200 degrees Celsius for 20 hours at a constant temperature to completely remove the hydrogen peroxide adsorbed...

Embodiment 2

[0074] First, hydrogen peroxide and lithium hydroxide are dissolved in water to form an aqueous solution with a concentration of lithium hydroxide of 0.45 moles per liter and a volume fraction of hydrogen peroxide of 1%. Under the condition of stirring, 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 above-mentioned 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 above-mentioned white solid was separated by filtration, and the moisture content of the separated solid was about 55%, and then put into an oven, and dried under vacuum at 50 degrees Celsius. Subsequently, the above-mentioned dried white solid was placed in an oven at 150 degrees centigrade for constant temperature annealing treatment for 24 hours to completely remove the hydrogen peroxide adsorbed and...

Embodiment 3

[0076] First, hydrogen peroxide and lithium hydroxide are dissolved in water to form an aqueous solution with a concentration of lithium hydroxide of 0.8 moles per liter and a volume fraction of hydrogen peroxide of 5%. Under the condition of stirring, slowly add 5 grams of titanium isopropoxide into the above 100 ml aqueous solution, and stir to form a yellow transparent solution. Subsequently, the above-mentioned 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 above-mentioned white solid was separated by means of suction filtration, and the moisture content of the separated solid was about 50%, and then put into an oven, and dried under vacuum at 70 degrees Celsius. Subsequently, the above-mentioned dried white solid was placed in an oven at 250 degrees centigrade for constant temperature annealing treatment for 2 hours to completely remove the hydroge...

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Abstract

The invention provides lithium titanate of a porous structure as well as a preparation method and application thereof. The preparation method comprises the following steps of S1, dispersing a titaniumsource into a hydrogen peroxide water solution containing lithium hydroxide to obtain a dispersion solution; S2, performing heating reaction on the dispersion solution obtained in the S1 to obtain precursors; S3, separating and drying the precursors obtained in the S2; S4, performing low-temperature annealing treatment on the dried precursors; S5, performing high-temperature annealing treatment on the precursors subjected to low-temperature annealing treatment in S4 to obtain the lithium titanate of the porous structure. The lithium titanate of a linear porous structure, a linear and regularparticles existence porous structure and a regular particle porous structure can be prepared by the method, and these structures cannot be realized by other methods.

Description

technical field [0001] The invention relates to the field of preparation of energy and environment-friendly materials. Specifically, the invention relates to a lithium titanate with a porous structure 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 and discharge cycles can reach more than thousands of times. The size and morphology of lithium titanate can greatly affect its application in lithium-ion batteries. For example, porous structure materials have large specific surface area and high porosity, which make them have many excellent characteristics in application. The 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(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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