A kind of lithium titanate with linear hierarchical structure and its preparation method and application

A technology of structural lithium titanate and hierarchical structure, applied in the directions of titanate, structural parts, alkali metal titanate, etc., can solve problems such as the inability to realize hierarchical structure materials, and the inability to further improve the effective separation and transportation of hierarchical structure materials.

Active Publication Date: 2021-01-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hierarchical structures of lithium titanate, titanic acid, and titanium dioxide reported so far are all granular, and it is impossible to realize a hierarchical structure material with a one-dimensional structure, and it is impossible to further improve the effective separation and transport of electrons by the hierarchical structure material.

Method used

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  • A kind of lithium titanate with linear hierarchical structure and its preparation method and application
  • A kind of lithium titanate with linear hierarchical structure and its preparation method and application
  • A kind of lithium titanate with linear hierarchical structure and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0083] according to figure 1 The flow process, under stirring conditions, disperse and dissolve 1 gram of titanyl sulfate in 100 ml of aqueous solution to form a solution, and then slowly dropwise add ammonia water with a concentration of 0.05 moles per liter to the above solution until the solution is neutral, so that titanyl sulfate Gradually and completely hydrolyzed to form a hydrated titanic acid precipitate, and then ultrasonically dispersed the hydrated titanic acid precipitate, washed with deionized water for several times, and centrifuged. Secondly, hydrogen peroxide and lithium hydroxide are dissolved in water to form an aqueous solution with a concentration of lithium hydroxide of 0.7 moles per liter and a volume fraction of hydrogen peroxide of 2.5%. Subsequently, the hydrated titanic acid precipitate after centrifugation was dispersed in 100 ml of the above-prepared aqueous hydrogen peroxide solution containing lithium hydroxide, and stirred to form a yellow trans...

Embodiment 2

[0087] according to figure 1 The flow process, under stirring conditions, disperse and dissolve 2 grams of titanium sulfate in 100 ml of aqueous solution to form a solution, and then slowly add sodium hydroxide with a concentration of 0.1 moles per liter to the above solution until the solution is neutral, making titanium sulfate Gradually and completely hydrolyzed to form a hydrated titanic acid precipitate, and then ultrasonically dispersed the hydrated titanic acid precipitate, washed with deionized water for several times, and centrifuged. Secondly, 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 4%. Subsequently, the hydrated titanic acid precipitate after centrifugation was dispersed in 100 ml of the above-prepared aqueous hydrogen peroxide solution containing lithium hydroxide, and stirred to form a yellow transparent ...

Embodiment 3

[0090] according to figure 1 According to the process, under stirring conditions, disperse and dissolve 0.3 g of titanium tetrafluoride in 100 ml of aqueous solution to form a solution, and then slowly add tetramethylammonium hydroxide with a concentration of 0.10 moles per liter into the above solution until the solution is medium properties, the titanium tetrafluoride is gradually and completely hydrolyzed to form a hydrated titanic acid precipitate, and then the hydrated titanic acid precipitate is ultrasonically dispersed, washed with deionized water for several times, and centrifuged. Secondly, hydrogen peroxide and lithium hydroxide are dissolved in water to form an aqueous solution with a concentration of lithium hydroxide of 0.4 moles per liter and a volume fraction of hydrogen peroxide of 1%. Subsequently, the hydrated titanic acid precipitate after centrifugation was dispersed in 100 ml of the above-prepared aqueous hydrogen peroxide solution containing lithium hydro...

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Abstract

The invention provides a lithium titanate with a linear hierarchical structure and a preparation method and application thereof. The method includes: (S1) dispersing a titanium source in an aqueous hydrogen peroxide solution containing lithium hydroxide to obtain a transparent solution; (S2) heating the transparent solution obtained in step (S1) to react to obtain a linear structure precursor; (S3) separating and drying the linear structure precursor obtained in step (S2); (S4) subjecting the dried linear structure precursor in step (S3) to hydrothermal reaction to obtain the linear hierarchical structure titanic acid lithium. The obtained linear hierarchical structure lithium titanate long axis is conducive to the effective transfer of electrons, the 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 between the electrolyte and the electrode. area, reduce the current density, and have better battery rapid charge and discharge performance.

Description

technical field [0001] The invention relates to the field of materials, in particular, the invention relates to a lithium titanate with a linear hierarchical structure and a preparation method and application thereof. Background technique [0002] Lithium titanate, titanic acid and titanium dioxide have been widely used in the fields of lithium-ion batteries, potassium-ion batteries, sodium-ion batteries, catalysis, photocatalysis, solar cells, photolysis of water, sensing and biology, etc., and are research hotspots in the field of materials . [0003] The application properties of lithium titanate, titanic acid and titanium dioxide materials are closely related to their morphology and structure. Compared with single crystal nanoparticles, one-dimensional linear nanomaterials can reduce the grain boundaries between particles, which is conducive to the transport of carriers in the long axis direction, and has the following characteristics: (1) at the nanoscale , the specif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/00H01M4/485
CPCC01G23/005C01P2004/03C01P2004/10C01P2004/61C01P2006/40H01M4/485Y02E60/10
Inventor 李建明金旭王晓琦焦航刘晓丹孙亮苏玲
Owner PETROCHINA CO LTD
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