Composite lithium oxide film and preparation method and application thereof

A lithium oxide and composite technology, which is applied in the field of composite lithium oxide thin film and its preparation, can solve the problem of unsatisfactory electrochemical properties such as charge and discharge efficiency and specific capacity cycle of the positive electrode sheet, charge and discharge efficiency, specific capacity and cycle Unsatisfactory chemical properties and other problems, to prevent irreversible side reactions, reduce irreversible side reactions, and reduce stress

Active Publication Date: 2019-08-30
GUILIN UNIV OF ELECTRONIC TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 oxide film and a preparation method thereof, to solve the problem of forming an active layer almost by coating when the existing lithium oxide is used as a positive electrode material The technical problems of unsatisfactory electrochemical performance such as charge and discharge efficiency, specific capacity and cycle of the positive electrode sheet
[0006] Another object of the present invention is to provide an electrode sheet and an application of the electrode sheet to solve the technical problems of the existing lithium oxide-containing electrode sheet such as unsatisfactory electrochemical properties such as charge-discharge efficiency, specific capacity, and cycle.

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  • Composite lithium oxide film and preparation method and application thereof
  • Composite lithium oxide film and preparation method and application thereof
  • Composite lithium oxide film and 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 oxide thin film. The preparation method of the composite lithium oxide film comprises the following steps:

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

[0024] Wherein, in the co-sputtering process, the energy density contributes the host element target material to realize the doping of lithium oxide, so that the lithium oxide is grown on the substrate, and the energy density contributes the host element as the doping The film layer of the element, so that a larger surface area is formed in the composite lithium oxide film for lithium ions to be accommodated, so as to significantly reduce the interface resistance of the composite lithium oxide film. At the same time, because ...

Embodiment 1

[0038] Embodiment 1 provides a composite lithium oxide thin film and a preparation method thereof. The composite lithium oxide thin film is prepared according to a method comprising the following steps:

[0039] S11: Use a copper plate with a diameter of 70mm as the tray for the powder target material, sprinkle the lithium carbonate powder evenly on the tray, and use a 5-ton unidirectional press to dry press in one direction to obtain the lithium carbonate powder target material;

[0040] S12: Use the lithium carbonate powder target prepared in step S11 and the purchased silicon ceramic target with a purity of 99.999% as a sputtering source on a Japanese 304 stainless steel substrate with a distance of 50 mm between the substrate and the target at 1.0×10 -2 In a mixed atmosphere of high-purity argon and oxygen at millibars, Li 2 CO 3 :Si=2:1 power ratio co-sputtering method to prepare LiO with a thickness of 1 μm 2 - Si composite film; during deposition, the substrate was k...

Embodiment 2

[0043] Embodiment 1 provides a composite lithium oxide thin film and a preparation method thereof. The composite lithium oxide thin film is prepared according to a method comprising the following steps:

[0044] S11: Use a copper plate with a diameter of 70mm as the tray for the powder target material, sprinkle the lithium oxide powder evenly on the tray, and use a 5-ton unidirectional press to dry-press in one direction to obtain the lithium oxide powder target material;

[0045] S12: The lithium oxide powder target prepared in step S11 and the purchased nickel ceramic target with a purity of 99.999% were used as sputtering sources on a Japanese 304 stainless steel substrate with a distance of 50 mm between the substrate and the target at 1.0×10 -2 In a mixed atmosphere of high-purity nitrogen and oxygen in millibars, LiO 2 :Ni=4:1 power ratio co-sputtering method to prepare LiO with a thickness of 1 μm 2 - Ni composite film; during deposition, the substrate was kept at 400...

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Abstract

The invention provides a composite lithium oxide film and a preparation method and an application thereof. The preparation method of the composite lithium oxide film comprises the step of performing co-sputtering treatment on a lithium oxide target material and an energy density contribution main element target material in an inert atmosphere so as to grow a composite lithium oxide film on a substrate. According to the preparation method of the composite lithium oxide film, the lithium oxide target material and the energy density contribution main element target material are directly depositedby adopting the co-sputtering method. The grown composite lithium oxide film is enabled to have the characteristic of low interfacial resistance. In addition, the generation of a solid electrolyte interface (SEI) film can be reduced, the stress of periodic volume change is relieved, and the structural stability of lithium ions in the embedding/disembedding process is maintained. Furthermore, thepreparation method effectively ensures that the grown composite lithium oxide film is stable in chemical performance.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to a composite lithium oxide film and its preparation method and application. Background technique [0002] Due to its 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. Among them, the performance of electrode materials directly determines the performance of lithium-ion batteries. [0003] Since lithium oxide such as lithium carbonate is the raw material for preparing various lithium compounds, it is the product with the largest output and the widest application among lithium salt products. It is widely used in chemical industry, metallurgy, ceramics, medicine, refrigeration and other industries, and can also be used to prepare Catalyst of chemical reaction, known as "industrial monosodium glutamate". Wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/131H01M4/1391H01M4/485H01M4/525H01G11/46H01G11/86C23C14/06C23C14/08C23C14/34
CPCH01M4/0426H01M4/1391H01M4/131H01M4/485H01M4/525H01G11/86H01G11/46C23C14/3464C23C14/08C23C14/06Y02E60/10
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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