Linear grading structure type lithium titanate and preparation method and application thereof

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

Active Publication Date: 2018-12-11
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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  • Linear grading structure type lithium titanate and preparation method and application thereof
  • Linear grading structure type lithium titanate and preparation method and application thereof
  • Linear grading structure type lithium titanate and preparation method and application thereof

Examples

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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 linear grading structure type lithium titanate and a preparation method and application thereof. The preparation method comprises the following steps of (S1) dispersing a titanium source into an aqueous solution of hydrogen peroxide containing lithium hydroxide, so as to obtain a transparent solution; (S2) heating the transparent solution obtained in step (S1) to react, so as to obtain a linear structure type precursor; (S3) separating the linear structure type precursor obtained in step (S2), and drying; (S4) performing heat liquid reaction on the dried linear structuretype precursor in step (S3), so as to obtain the linear grading structure type lithium titanate. The obtained linear grading structure type lithium titanate is suitable for the effective transfer ofelectrons, is suitable for the quick embedding-in and embedding-out process of lithium ions, sodium ions or potassium ions by the grading structure, and is suitable for increasing the contact area between an electrolyte and an electrode by the large specific surface area, and reducing the current density; the better quick charge and discharge property of a battery is realized.

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 Applications(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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