Linear porous lithium titanate material and preparation and product thereof

A technology of porous lithium titanate and lithium titanate, applied in the field of linear porous lithium titanate material and its preparation and products, to achieve the effects of increasing specific surface area, improving battery performance, and simple preparation process

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

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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  • Linear porous lithium titanate material and preparation and product thereof
  • Linear porous lithium titanate material and preparation and product thereof
  • Linear porous lithium titanate material and preparation and product thereof

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 grams of titanium isopropoxide was dispersed in 100 ml of water, then 5 ml of hydrogen peroxide with a concentration of 30% was added, and stirred to form a titanium-containing peroxy complex suspension. Next, 3.5 g of lithium hydroxide was added to the above-mentioned peroxy complex suspension, and stirred to form a pale yellow transparent solution. Subsequently, the above-mentioned light yellow transparent solution was heated to 80 degrees Celsius and stirred at constant temperature for 6 hours to obtain a white product of lithium peroxytitanate with a linear structure. The reaction was stopped and a white solid was obtained by separation. Subsequently, the above-mentioned white solid was dried and then placed in an oven at 200 degrees Celsius for constant temperature annealing treatment for 20 hours to obtain amorphous lithium titanate with linear structure. Next, the amo...

Embodiment 2

[0081] according to figure 1 Process for preparing linear porous lithium titanate materials. First, 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 peroxy complex suspension. Next, 1 g of lithium peroxide was added to the above-mentioned peroxy complex suspension, and stirred to form a pale yellow transparent solution. Subsequently, the above-mentioned light yellow transparent solution was heated to 60 degrees Celsius and stirred at constant temperature for 24 hours to obtain a white product of lithium peroxytitanate with a linear structure. The reaction was stopped and a white solid was obtained by separation. Subsequently, the above-mentioned white solid was dried and then placed in an oven at 150 degrees Celsius for constant temperature annealing treatment for 24 hours to obtain amorphous lithium titanate with linear structure. Next, the amorphous lithium titanate was immersed in wa...

Embodiment 3

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

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Abstract

The invention provides a linear porous lithium titanate material and preparation and product thereof. The linear porous lithium titanate material is characterized in that the crystal phase is spinel lithium titanate; the lithium titanate material is of a linear structure; the length to diameter ratio of the linear structure is greater than 10; the linear lithium titanate material is of a porous structure; the structure of the linear porous lithium titanate material consists of a plurality of particles; each particle has the fixed growth direction. The linear porous lithium titanate material has the advantages that the long axis of the structure is suitable for the effective transfer of electrons; the porous structure is suitable for the quick embedding-in and embedding-out process of lithium ions, sodium ions or potassium ions; the large specific surface area is suitable for the contact area between an electrolyte and an electrode, so that the current density is reduced, and the betterbattery quick charge and discharge property is realized.

Description

technical field [0001] The invention relates to the field of preparation of energy and environmental protection materials, in particular, the invention relates to a linear porous lithium titanate material and its preparation and products. Background technique [0002] Lithium titanate is an ideal and promising negative electrode material for lithium ion batteries, and its charge-discharge cycle can reach more than thousands of times. [0003] The size and morphology of lithium titanate can greatly affect its application in lithium-ion batteries. Compared with particles, the linear structure of lithium titanate material can reduce the grain boundaries 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 migration of electrons. , the short axis is conducive to the rapid intercalation and intercalation of lithium, sodium or potassium ions. ...

Claims

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Application Information

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Patent Type & Authority Applications(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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