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Linear hierarchy lithium titanate material, as well as preparation and application thereof

A technology to structure lithium titanate, hierarchical structure, applied in the direction of titanate, nanotechnology for materials and surface science, structural parts, etc.

Active Publication Date: 2018-12-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there are still great technical challenges for the development of a preparation method that is simple in the process and convenient for large-scale production of lithium titanate, especially the preparation method of lithium titanate materials with a linear hierarchical structure

Method used

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  • Linear hierarchy lithium titanate material, as well as preparation and application thereof
  • Linear hierarchy lithium titanate material, as well as preparation and application thereof
  • Linear hierarchy lithium titanate material, as well as preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0090] First, 2 g of titanium isopropoxide was dispersed in 100 ml of water, and then 5 ml of hydrogen peroxide with a concentration of 30% was added, and stirred to form a titanium-containing peroxo complex suspension. Next, 3.5 grams of lithium hydroxide was added to the suspension of the above-mentioned peroxo complex, and stirred to form a light yellow transparent solution. Subsequently, the above-mentioned light yellow transparent solution was heated to 80 degrees Celsius and then stirred at constant temperature for 6 hours to obtain a white product of lithium peroxotitanate with a linear structure. The reaction was stopped and separated and dried to obtain a white solid. Subsequently, the above-mentioned white solid was dispersed in 100 ml of water, and hydrothermally reacted at 120 degrees Celsius for 6 hours to obtain a lithium titanate precursor with a linear hierarchical structure. Finally, the linear hierarchical structure lithium titanate precursor obtained above w...

Embodiment 2

[0097] Firstly, 2 g of tetrabutyl titanate was dispersed in 100 ml of water, then 5 ml of 30% hydrogen peroxide was added, and stirred to form a titanium-containing peroxo complex suspension. Next, 3.5 grams of lithium hydroxide was added to the suspension of the above-mentioned peroxo complex, and stirred to form a light yellow transparent solution. Subsequently, the above-mentioned light yellow transparent solution was heated to 80 degrees Celsius and then stirred at constant temperature for 6 hours to obtain a white product of lithium peroxotitanate with a linear structure. The reaction was stopped and separated and dried to obtain a white solid. Subsequently, the above-mentioned dried white solid was placed in an oven at 150 degrees Celsius for 4 hours to obtain a linear structure lithium peroxytitanate with peroxide radicals removed from the surface. Next, the above-mentioned white solid was dispersed in 100 ml of water, and hydrothermally reacted at 120 degrees Celsius f...

Embodiment 3

[0103] First, 1 gram of titanic acid was dispersed in 100 ml of water, then 6 ml of 30% hydrogen peroxide was added, and stirred to form a titanium-containing peroxo complex suspension. Next, add 4 grams of lithium hydroxide to the suspension of the above-mentioned peroxo complex, and stir to form a light yellow transparent solution. Subsequently, the above light yellow transparent solution was heated to 90 degrees Celsius and then stirred at constant temperature for 5 hours to obtain a white product of lithium peroxotitanate with a linear structure. The reaction was stopped and separated and dried to obtain a white solid. Next, the above-mentioned white solid was dispersed in 100 ml of isopropanol to water in an alcoholic aqueous solution with a ratio of 1:5, and hydrothermally reacted at 100 degrees Celsius for 8 hours to obtain a lithium titanate precursor with a linear hierarchical structure. Finally, the linear hierarchical structure lithium titanate precursor obtained ab...

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Abstract

The invention provides a linear hierarchy lithium titanate material, as well as preparation and application thereof. The lithium titanate material has a spinel crystal phase, or a monoclinic crystal phase or a composite crystal phase of spinel and monoclinic crystal phases, wherein the lithium titanate material is mainly formed by a linear hierarchy structure which has a draw ratio of more than 10; and the surface of the lithium titanate material with the linear hierarchy structure is formed by nanosheets. According to the linear hierarchy lithium titanate material, the long axis of the linearstructure is favorable to effective mobility of electrons, the flaky hierarchy structure is favorable to the process of quickly embedding in and out lithium ions, sodium ions or potassium ions, a large specific surface area is favorable to the contact area of electrolyte and electrode, the current density is reduced, and the material has relatively good battery quick charge and discharge performance.

Description

technical field [0001] The invention relates to the field of energy, in particular, the invention relates to a lithium titanate material with a linear hierarchical structure and its preparation and application. Background technique [0002] Lithium titanate is an ideal and promising negative electrode material for lithium-ion batteries. Its charge and discharge cycles can reach more than thousands of times, and it is a research hotspot in the field of electrode materials. [0003] The size and morphology of lithium titanate can greatly affect its application in lithium-ion batteries. For example, hierarchical structure materials can make full use of the nanostructure properties of materials while retaining the microstructure functions of materials. The composition of hierarchical structure materials is usually small nano-particles, which can increase the specific surface area of ​​the material and improve the nanoscale performance of the material; the overall structure of t...

Claims

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Application Information

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IPC IPC(8): C01G23/00B82Y30/00B82Y40/00H01M4/485H01M4/36H01M4/587H01M4/38H01M4/62H01M10/0525H01M10/054
CPCH01M4/362H01M4/38H01M4/485H01M4/587H01M4/62H01M4/625H01M4/626H01M10/0525H01M10/054B82Y30/00B82Y40/00C01G23/005C01P2004/61C01P2004/62C01P2004/64C01P2006/40C01P2002/72C01P2004/16C01P2004/03C01P2004/20C01P2004/54Y02E60/10C01P2002/32C01P2002/74C01P2004/24H01M2004/021
Inventor 李建明金旭王晓琦孙亮苏玲刘晓丹
Owner PETROCHINA CO LTD
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