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A kind of linear porous lithium titanate material and its preparation and product

A technology of porous lithium titanate and lithium titanate, applied to the field of linear porous lithium titanate material and its preparation and products, to achieve the effects of low production cost, easy availability of raw materials, and good battery rapid charge and discharge performance

Active Publication Date: 2021-08-03
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 porous linear structure.

Method used

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  • A kind of linear porous lithium titanate material and its preparation and product
  • A kind of linear porous lithium titanate material and its preparation and product
  • A kind of linear porous lithium titanate material and its preparation and product

Examples

Experimental program
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Effect test

Embodiment 1

[0071] according to figure 1 Process for preparing linear porous lithium titanate materials. 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 peroxytitanate with a linear structure, which was stopped and separated to obtain a white solid. Subsequently, the above-mentioned white solid was dried and placed in an oven at 200 degrees centigrade for constant temperature annealing treatment for 20 hours to obtain amorphous lithium titanate with a linear structure. Next, soak...

Embodiment 2

[0081] according to figure 1 Process for preparing linear porous lithium titanate materials. Firstly, 0.3 g of titanium sulfate was dispersed in 100 ml of water, then 2 g of urea peroxide was added, and stirred to form a titanium-containing peroxo complex suspension. Next, add 1 gram of lithium peroxide to the suspension of the peroxo complex, and stir to form a light yellow transparent solution. Subsequently, the above light yellow transparent solution was heated to 60 degrees Celsius and then stirred at constant temperature for 24 hours to obtain a white product of lithium peroxotitanate with a linear structure, which was stopped and separated to obtain a white solid. Subsequently, the above white solid was dried and placed in an oven at 150 degrees centigrade for constant temperature annealing treatment for 24 hours to obtain amorphous lithium titanate with a linear structure. Next, soak the amorphous lithium titanate in water at a mass ratio of 1:1000 to water, soak for ...

Embodiment 3

[0083] according to figure 1Process for preparing linear porous lithium titanate materials. First, 8 grams of hydrated titanic acid were dispersed in 80 milliliters of water, and then 25 milliliters of 30% hydrogen peroxide was added, and stirred to form a titanium-containing peroxo complex suspension. Next, add 3 grams of lithium oxide to the above peroxo complex suspension, and stir to form a light yellow transparent solution. Subsequently, the above-mentioned light yellow transparent solution was heated to 100 degrees Celsius and then stirred at constant temperature for 1 hour to obtain a white product of lithium peroxytitanate with a linear structure, which was stopped and separated to obtain a white solid. Subsequently, the above-mentioned white solid was dried and placed in an oven at 250 degrees centigrade for constant temperature annealing treatment for 2 hours to obtain amorphous lithium titanate with a linear structure. Next, the amorphous lithium titanate was soak...

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Abstract

The invention provides a linear porous lithium titanate material and its preparation and product. The material includes: the crystal phase of the lithium titanate material is spinel lithium titanate; the lithium titanate material has a linear structure; the aspect ratio of the linear structure is greater than 10; the linear structure The lithium titanate material has a porous structure; the structure of the linear porous lithium titanate material is composed of a plurality of particles, and the particles have a directional growth direction. The long axis of the structure is conducive to the effective migration of electrons, the porous 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. Better battery rapid charge and discharge performance.

Description

technical field [0001] The invention relates to the field of preparation of energy and environment-friendly materials. Specifically, the invention relates to a linear porous lithium titanate material and its preparation and product. 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. Compared with particles, the linear structure lithium titanate material can reduce the grain boundary between particles, which is conducive to the transport of carriers in the direction of the long axis. In the field of battery electrode materials, the long axis is conducive to the effective transfer of electrons , the short axis is conducive to the rapid intercalation and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M10/0525C01G23/00
CPCH01M4/485H01M10/0525C01G23/005C01P2004/16C01P2004/54C01P2002/76C01P2004/64C01P2004/62C01P2004/61C01P2006/16Y02E60/10H01M2004/021
Inventor 李建明金旭刘合王晓琦刘晓丹焦航
Owner PETROCHINA CO LTD
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