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Composite lithium titanate thin film as well as preparation method and application thereof

A technology of composite lithium titanate and lithium titanate, which is applied in the direction of hybrid capacitor electrodes, electrical components, electrochemical generators, etc., can solve the problem of unsatisfactory charge-discharge cycle and large-rate performance, prone to interactive gases, and electronic conductivity. Poor performance and other problems, achieve good cycle reversibility, prevent irreversible side reactions, and reduce strain

Inactive Publication Date: 2019-08-27
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, to provide a composite lithium titanate film and its preparation method, to solve the problems of poor electronic conductivity and easy interaction with the electrolyte in the existing lithium titanate And the technical problem of gas evolution during the charge-discharge cycle reaction
[0006] Another purpose of the present invention is to provide an electrode sheet and the application of the electrode sheet to solve the technical problems of the existing lithium titanate-containing electrode sheet with unsatisfactory charge-discharge cycle and high-rate performance

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  • Composite lithium titanate thin film as well as preparation method and application thereof
  • Composite lithium titanate thin film as well as preparation method and application thereof
  • Composite lithium titanate thin film as well as preparation method and application thereof

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preparation example Construction

[0022] On the one hand, an embodiment of the present invention provides a method for preparing a composite lithium titanate thin film. The preparation method of described composite lithium titanate film comprises the steps:

[0023] The lithium titanate target and the energy density contributing host element target are subjected to co-sputtering treatment in an inert atmosphere, and a composite lithium titanate thin film is grown on the substrate.

[0024] Wherein, in the co-sputtering process, the energy density contributes the main element target material to achieve doping lithium titanate, thereby growing on the substrate with lithium titanate as the substrate, and the energy density contributes the main element as Doping the film layer of elements, so that a larger specific surface area and a rich pore structure are formed in the composite lithium titanate film, and the pore structure facilitates the transmission of lithium ions, which not only improves the transmission of...

Embodiment 1

[0039] Embodiment 1 provides a composite lithium titanate thin film and a preparation method thereof. The composite lithium titanate thin film is prepared according to a method comprising the following steps:

[0040] S11: Preparation of lithium titanate powder target:

[0041] Weigh lithium hydroxide and tetrabutyl titanate at a molar ratio of Li:Ti=0.86:1, dissolve tetrabutyl titanate in an equal volume of ethanol, and keep stirring; dissolve lithium hydroxide in deionized Make a saturated solution in water. After stirring, slowly add the saturated solution of lithium hydroxide to the continuously stirring tetrabutyl titanate solution. Dry it, place it in a horse boiling furnace and calcinate for 6 hours, and then calcinate at 800°C after grinding to obtain lithium titanate powder; use a copper plate with a diameter of 70mm as the tray for the powder target, and evenly sprinkle the lithium titanate powder on the tray. Use a 5-ton uniaxial press for unidirectional dry press...

Embodiment 2

[0045] Embodiment 1 provides a composite lithium titanate thin film and a preparation method thereof. The composite lithium titanate thin film is prepared according to a method comprising the following steps:

[0046] S11: Preparation of lithium titanate powder target:

[0047] Weigh lithium hydroxide and tetrabutyl titanate at a molar ratio of Li:Ti=0.86:1, dissolve tetrabutyl titanate in an equal volume of ethanol, and keep stirring; dissolve lithium hydroxide in deionized Make a saturated solution in water. After stirring, slowly add the saturated solution of lithium hydroxide to the continuously stirring tetrabutyl titanate solution. Drying, placing in a horse boiling furnace for calcination for 6 hours, grinding and then calcination at 800°C to obtain lithium titanate powder;

[0048] Use a copper plate with a diameter of 70mm as the tray for the powder target material, sprinkle the lithium titanate powder evenly on the tray, and use a 5-ton uniaxial press to dry press ...

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Abstract

The invention provides a composite lithium titanate thin film as well as a preparation method and an application thereof. The preparation method of the composite lithium titanate thin film comprises the following steps of carrying out co-sputtering treatment on a lithium titanate target material and an energy density contribution main body element target material in an inert atmosphere, and growing the composite lithium titanate thin film on a substrate. According to the preparation method of the composite lithium titanate thin film, the lithium titanate target material and the energy densitycontribution main body element target material are directly deposited and formed by adopting a co-sputtering method. Therefore, the grown composite lithium titanate thin film has a rich channel structure and is stable in structure, so that high lithium ion transmission rate can be provided, and high cycling reversibility and relatively high specific capacity are maintained; and meanwhile, the direct contact of an electrolyte and a nano-scale energy density contribution main body element is effectively prevented, the irreversible side reaction between the electrolyte and the energy density contribution main body can be reduced and blocked, and the generation of a solid electrolyte membrane (SEI) is reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to a composite lithium titanate thin film and its preparation method and application. Background technique [0002] Due to its safety, high capacity, high energy density, low cost, long cycle life, and high operating voltage, lithium batteries have become one of the most potential energy storage systems today and have been widely used. For example, due to the convenient and portable characteristics of lithium batteries, it has been widely used as a portable new energy source in many electronic product fields. Among them, the performance of electrode materials directly determines the performance of lithium-ion batteries. [0003] At present, the key research direction of anode materials for lithium-ion batteries is developing in the direction of power battery materials with high specific capacity, high rate, high cycle performance and high safety performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/131H01M4/485H01M4/62H01M10/0525H01G11/46H01G11/50
CPCH01G11/46H01G11/50H01M4/131H01M4/362H01M4/485H01M4/628H01M10/0525Y02E60/10
Inventor 俞兆喆魏堃程燕杨道国徐华蕊蔡苗朱归胜颜东亮
Owner GUILIN UNIV OF ELECTRONIC TECH
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