A linear hierarchical structure lithium titanate material and its preparation and application

A technology of structural lithium titanate and hierarchical structure, applied in nanotechnology, titanate, structural parts, etc. for materials and surface science, to achieve the effect of improving application effect, increasing contact area, and facilitating transportation

Active Publication Date: 2021-04-30
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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  • A linear hierarchical structure lithium titanate material and its preparation and application
  • A linear hierarchical structure lithium titanate material and its preparation and application
  • A linear hierarchical structure lithium titanate material and its preparation and application

Examples

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Comparison scheme
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 lithium titanate material with a linear hierarchical structure and its preparation and application. The crystal phase of the lithium titanate material is a spinel crystal phase, or a monoclinic crystal phase or their composite crystal phase; the lithium titanate material is mainly composed of a linear hierarchical structure; the linear graded The aspect ratio of the structure is greater than 10; the surface constituents of the lithium titanate material of the linear hierarchical structure are nanosheets. The long axis of the linear structure is conducive to the effective transfer of electrons, the sheet-like hierarchical structure is conducive to the rapid intercalation and intercalation of lithium ions, sodium ions or potassium ions, and the large specific surface area is conducive to the contact area between the electrolyte and the electrode, reducing The current density has better battery rapid 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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Patent Type & Authority Patents(China)
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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