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Preparation method and application of titanate-based hollow material

A titanate, layered titanate technology, applied in the directions of alkaline earth metal titanate, titanate, chemical instruments and methods, etc., can solve the problems of harsh conditions, lack of material stress, poor cycle performance, etc. Achieve the effect of simple preparation process, lower production cost, and improved capacity characteristics

Pending Publication Date: 2022-01-04
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Regarding the method of interlayer regulation, Dunn et al. first used the liquid phase method to make bulk sodium titanate (Na 2 Ti 3 o 7 ) were exfoliated into multilayer nanosheets, and then cation-exchange method was used to intercalate large-radius methylamine and propylamine, thus expanding the Na 2 Ti 3 o 7 The interlayer spacing improves the capacity and cycle stability of the material, but the entire stripping process takes too long and requires harsh conditions (ACS Appl. Mater. Interfaces, 2017, 9, 1416-1425)
Gray et al. first converted Na under acidic conditions 2 Ti 3 o 7 exfoliated into nanosheets, followed by reorganization under alkaline conditions to form interlayer chaotically arranged Na 2 Ti 3 o 7 , the irregular interlayer arrangement provides more active sodium storage sites, which improves the capacity of the material, but its cycle performance is still poor (Chem. Mater., 2018, 30, 1505-1516)
In addition, although interlayer regulation can improve the dynamic properties of materials, it still has shortcomings in relieving the stress of materials.

Method used

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  • Preparation method and application of titanate-based hollow material
  • Preparation method and application of titanate-based hollow material
  • Preparation method and application of titanate-based hollow material

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Lithium titanate is the first hydrothermal product to prepare magnesium titanate hollow nanospheres:

[0056] Add 18mL of ammonia water and 2.6mL of ethyl orthosilicate into 30mL of ethanol, and react at room temperature for 60min to obtain silica nanospheres. Add 0.6 g of the above-mentioned silica nanospheres to 40 mL of ethanol, add 0.6 g of hexadecylamine, 10 mL of ammonia water and 5 mL of isopropyl titanate and react for 20 min to obtain amorphous titanium dioxide-coated silica core-shell nanospheres. The diameter of the titanium dioxide-coated silicon dioxide core-shell nanosphere is about 500 nm, and the thickness of the titanium dioxide shell layer is about 50 nm.

[0057] The above-mentioned amorphous titania-coated silica core-shell nanospheres were placed in 0.4M LiOH solution for hydrothermal reaction, the reaction temperature was 160°C, and the reaction time was 6h to obtain a layered hollow lithium titanate nanosphere material . After washing and drying...

Embodiment 2

[0060] Lithium titanate is the first hydrothermal product to prepare calcium titanate hollow nanospheres:

[0061] Add 18mL of ammonia water and 2.6mL of ethyl orthosilicate into 30mL of ethanol, and react at room temperature for 60min to obtain silica nanospheres. Add 0.6 g of the above-mentioned silica nanospheres to 40 mL of ethanol, add 0.6 g of hexadecylamine, 10 mL of ammonia water and 5 mL of isopropyl titanate and react for 20 min to obtain amorphous titanium dioxide-coated silica core-shell nanospheres. The diameter of the titanium dioxide-coated silicon dioxide core-shell nanosphere is about 500 nm, and the thickness of the titanium dioxide shell layer is about 50 nm.

[0062] The above-mentioned amorphous titania-coated silica core-shell nanospheres were placed in 0.8M LiOH solution for hydrothermal reaction, the reaction temperature was 140°C, and the reaction time was 8h, and the layered hollow lithium titanate nanosphere material was obtained. . After washing a...

Embodiment 3

[0065] Lithium titanate is the first hydrothermal product to prepare magnesium titanate hollow nanotube arrays:

[0066] Titanium dioxide nanotube arrays were prepared by the anodic polarization method. The sodium fluoride solution with a concentration of 0.3M was used as the etchant, and the mixed solution of deionized water and ethylene glycol with a volume ratio of 1:8 was used as the solvent. The reaction time was 2 h, and the loading voltage was 50V, the titania nanotube array with amorphous structure was obtained, the inner diameter was 150nm, the outer diameter was 180nm, and the length was 4μm.

[0067] The TiO nanotube arrays with the above amorphous structure were placed in 0.3M LiOH·H 2 The O solution was subjected to hydrothermal reaction, the reaction temperature was 150° C., and the reaction time was 6 h, and the layered lithium titanate nanotube array material was obtained. After cleaning and drying, the layered lithium titanate nanotube arrays were placed in 4...

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Abstract

The invention discloses a preparation method and application of a titanate-based hollow material. The titanate-based hollow material containing different types of cations is prepared through a two-step method. In the first step, amorphous titanium dioxide is converted into a layered titanate material in an alkaline environment of lithium, sodium and potassium, and in the second step, a cation replacement reaction is carried out in a salt solution containing cations except for lithium, sodium and potassium, so that the layered titanate material with a three-dimensional hollow structure containing metal cations except for lithium, sodium and potassium is prepared. Metal cations are embedded through a two-step method, so that the interlayer spacing of the material can be effectively expanded, and the structural stability of the material is improved. The hollow micro-nano structure of the titanate material is beneficial to relieving deformation stress generated in the ion embedding / removing process.

Description

technical field [0001] The invention belongs to the field of energy and nano material preparation, and in particular relates to a preparation method and application of a titanate-based hollow material. Background technique [0002] New energy sources such as solar energy, wind energy, and tidal energy have the advantages of sustainability and environmental protection, but due to their intermittent nature in the energy conversion process, they cannot provide stable power supply. Therefore, developing an effective energy storage system to build a large-scale power grid is one of the effective ways to solve the unstable power supply of new energy. Secondly, with the development of electric vehicles and portable devices such as mobile phones, computers and digital cameras, the demand for energy storage devices with high performance, safety and good cycle performance is particularly urgent, and suitable electrode materials are the key to the development of high-performance storag...

Claims

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Application Information

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IPC IPC(8): C01G23/00H01M4/36H01M4/58H01M10/0525
CPCC01G23/003C01G23/006H01M4/366H01M4/5825H01M10/0525C01P2004/13C01P2004/03H01M2004/027Y02E60/10
Inventor 于乐李念武陈冲张心雨李沁韩
Owner BEIJING UNIV OF CHEM TECH
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