Lithium titanate composite material, preparation method and applications thereof

A composite material and lithium titanate technology, which is applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, electrical components, etc., can solve the problem that it is impossible to ensure that a uniform and continuous zirconium phosphate protective layer is formed on the surface of the particles, and the thickness of the coating layer is uncontrollable , the coating layer is not uniform enough, etc., to achieve the effects of suppressing side reactions, being environmentally friendly, and avoiding direct contact

Inactive Publication Date: 2018-08-28
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the coating layer formed on the surface of the particles by the above method is not uniform enough, and the thickness of the coating layer is uncontrollable, and it is impossible to ensure that a uniform and continuous zirconium phosphate protective layer is formed on the surface of the particles, which makes the large-scale industrial application of this method difficult.

Method used

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  • Lithium titanate composite material, preparation method and applications thereof
  • Lithium titanate composite material, preparation method and applications thereof
  • Lithium titanate composite material, preparation method and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Add the lithium titanate bulk material into a three-neck round bottom flask, add absolute ethanol, deionized water (70 ml) and ammonia water (4 ml) respectively, and disperse ultrasonically for 5 minutes. Then, 3 ml of ethyl orthosilicate was added, stirred at room temperature for 10 hours, filtered, and washed with deionized water and ethanol three times respectively, to obtain a composite material with a core-shell structure. By adjusting the particle size of lithium titanate bulk, the amount of tetraethyl orthosilicate and ammonia water, SiO with adjustable coating thickness can be obtained. 2 Coated lithium titanate composite material.

[0029] The TEM photos of lithium titanate materials before and after coating are as follows: figure 1 shown in a and 1b. The results show that the lithium titanate composite material obtained by the above method has a uniform and continuous surface coating layer, and the thickness of the coating layer is about 15 nm.

Embodiment 2

[0031] Add the lithium titanate bulk material into a three-neck round bottom flask, add absolute ethanol, deionized water (70 ml) and ammonia water (4 ml) respectively, and disperse ultrasonically for 5 minutes. Then, add 6 milliliters of tetraethyl orthosilicate, stir at room temperature for 10 hours, filter, wash with deionized water and ethanol three times respectively, and obtain amorphous SiO with core-shell structure. 2 Composite wrap.

Embodiment 3

[0033] Add the lithium titanate bulk material into a three-neck round bottom flask, add absolute ethanol, deionized water (70 ml) and ammonia water (4 ml) respectively, and disperse ultrasonically for 5 minutes. Then, add 3 milliliters of tetraethyl orthosilicate, stir at room temperature for 5 hours, filter, wash with deionized water and ethanol three times respectively, and obtain amorphous SiO with core-shell structure. 2 Composite wrap.

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Abstract

The invention discloses a lithium titanate composite material, a preparation method and uses thereof, wherein the lithium titanate composite material has a core-shell structure, lithium titanate particles or modified lithium titanate particles are used as the core, a silicon compound is used as the shell, the molecule general formula of the lithium titanate is Li4+xTi5O12, x is more than or equalto -1 and is less than or equal to 1, the molecule general formula of the silicon compound is SiOy, and y is more than or equal to 0 and is less than or equal to 2. The preparation method is a liquidphase coating method or a gas phase coating method. According to the present invention, the lithium titanate composite material can be used in electrode materials or capacitor devices; and the preparation method has advantages of simple process, simple operation, low cost and environment protection, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of materials, batteries and capacitors, and relates to a lithium titanate composite material and a preparation method thereof. Background technique [0002] As society pays more and more attention to energy and environmental issues, people pay more and more attention to the research and development of rechargeable secondary batteries (ie storage batteries). Since the commercialization of lithium-ion batteries in the early 1990s, they have become an indispensable part of people's daily life due to their advantages such as high energy density and small size, and have achieved great commercial success in the field of small energy storage devices. However, emerging markets such as electric vehicles and the development of technology have put forward higher requirements for the comprehensive performance of lithium-ion batteries. An ideal lithium-ion battery should meet the following requirements: high energy dens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M10/0525
CPCH01G11/26H01G11/30H01G11/86H01M4/366H01M4/386H01M4/485H01M10/0525Y02E60/10
Inventor 刘金龙吕忱刘俊亮石磊张丕军
Owner BAOSHAN IRON & STEEL CO LTD
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