Tin-based composite thin film material for lithium ion battery as well as preparation method and application of thin film material

A technology of lithium-ion batteries and composite films, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of limited improvement in cycle performance and long time for preparing films, so as to improve repeatability, stability, and The effect of cycle performance

Inactive Publication Date: 2014-07-02
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, this method is used to prepare Sn-M multilayer films. Although the cycle performance of tin thin films has been improved to a certain extent, the degree of improvement in cycle performance is limited, and the preparation of films takes a long time, which cannot meet actual needs.

Method used

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  • Tin-based composite thin film material for lithium ion battery as well as preparation method and application of thin film material
  • Tin-based composite thin film material for lithium ion battery as well as preparation method and application of thin film material
  • Tin-based composite thin film material for lithium ion battery as well as preparation method and application of thin film material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A tin-based composite film material for lithium-ion batteries, such as figure 1 As shown, it is composed of foamed copper substrate and Sn-Al thin film. The thickness of the foamed copper substrate is 10 μm; The thickness of the Al film is 500nm.

[0029] The preparation method of the above-mentioned tin-based composite thin film material for lithium ion batteries adopts the simultaneous sputtering process of metal target Sn and metal Al to prepare a Sn-Al thin film on a foamed copper substrate, and the steps are as follows:

[0030] 1) Install the cleaned copper foam substrate at the sample position in the magnetron sputtering chamber, and then install the target material Sn. The distance from the substrate is 7cm, and the horizontal angle between the target and the cavity chamber is 20°;

[0031] 2) Vacuum the background of the magnetron sputtering chamber to 0.8×10 -3 Pa, the Ar gas with a purity of 99.999% is introduced into the cavity, the flow rate is 20sccm, t...

Embodiment 2

[0034] A tin-based composite film material for lithium-ion batteries, such as figure 1 As shown, it is composed of copper foil substrate and Sn-Al thin film, the thickness of copper foil substrate is 10 μm; The thickness of the Al film is 700nm.

[0035] The preparation method of the above-mentioned tin-based composite thin film material for lithium ion batteries adopts the simultaneous sputtering process of metal target Sn and metal Al to prepare a Sn-Al thin film on a copper foil substrate, and the steps are as follows:

[0036] 1) Install the cleaned copper foil substrate at the sample position in the magnetron sputtering chamber, and then install the target Sn, the purity of both the copper foil and the target Sn is 99.95%, the target Sn points to the copper foil at the sample position, and the target The distance from the substrate is 7cm, and the horizontal angle between the target and the cavity chamber is 20°;

[0037] 2) Vacuum the background of the magnetron sputte...

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Abstract

The invention provides a tin-based composite thin film material for a lithium ion battery. The tin-based composite thin film material is composed of a copper foil base or a foam copper base and an Sn-M thin film by stacking, wherein the Sn-M thin film is a thin film with a single-layered structure, and is composed of two elements including Sn and M; the Sn is alpha-Sn or beta-Sn; the M is Ti, Al or Zn; the thickness of the Sn-M thin film is 0.01-10 microns. A preparation method comprises the following step of preparing the Sn-M thin film on the copper foil base or the foam copper base by adopting a simultaneous sputtering process of a metal target Sn and the metal M. The thin film is used as an electrode material of a lithium battery. The tin-based composite thin film material for the lithium ion battery has the advantages that compared with a pure Sn film, the metal M is added so that the volume effect problems caused by embedding lithium ions on an electrode and releasing the lithium ions are inhibited, the circulating performance of the Sn is improved and the cycle life of a thin film cathode is prolonged. The method adopts a simple thin film preparation process; the production cost is reduced and the repeatability of preparing a thin-film material is improved; the tin-based composite thin film material for the lithium ion battery is hopeful to be applied to thin film type lithium batteries with high energy and high power.

Description

technical field [0001] The invention relates to a thin film material for a lithium ion battery, in particular to a tin-based composite thin film material for a lithium ion battery and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high open circuit voltage, high energy density, low self-discharge rate (<9% / month), long cycle life, and environmental protection. With the development of research technology and the continuous expansion of application fields, lithium-ion batteries are widely used in portable electronics The product market has been widely used and is expected to become one of the energy supplies for hybrid and pure electric vehicles in the future. [0003] Anode materials are one of the key factors that determine the overall performance of lithium-ion batteries. The widely used graphite anode materials have low energy density (372mAh / g, 760mAh / cm 3 ), the mass specific capacity is close...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/38
CPCY02E60/122H01M4/134H01M4/362H01M4/387H01M4/628H01M10/0525Y02E60/10
Inventor 陶占良魏林王丽秀陈军程方益梁静李海霞
Owner NANKAI UNIV
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