Aluminum-tin alloy film for lithium ionic cell negative electrode and method for preparing the same

A lithium-ion battery, aluminum-tin alloy technology, applied in the direction of electrode manufacturing, battery electrodes, ion implantation plating, etc., can solve the problem of electrode capacity reduction, achieve improved cycle performance, high charge and discharge capacity, and increase electrode capacity Effect
CN101339989AInactive Publication Date: 2009-01-07SOUTH CHINA NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTH CHINA NORMAL UNIVERSITY
Publication Date
2009-01-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a preparation method of a tin aluminum alloy membrane used in a lithium-ion battery cathode, which comprises the steps as follows: (1) a metal foil taken as a membrane electrode current collector is taken as a substrate for magnetron sputtering and the substrate is cleaned; (2) the air pressure of a sputtering chamber is adjusted to 1.0*10<-3>Pa or above, and then is adjusted within the range of 0.1-10Pa after inert gas is introduced; (3) the tin aluminum alloy membrane is prepared by magnetron sputtering, the sputtering power is needed to be adjusted within the range of 10W-5kW, the sputtering type belongs to DC magnetron sputtering or RF magnetron sputtering, and the sputtering deposition time is controlled within the range of 10-60 minutes. The tin aluminum alloy membrane used in the lithium-ion battery cathode prepared by using the method is composed of the tin aluminum alloy of solid solution alloy material; the tin aluminum alloy comprises 25-75% of tin and the rest is aluminum. The preparation method has the advantages of simple process, low cost, high efficiency and no by-product; the prepared membrane electrode material has uniform crystal grain, and good crystallinity and mechanical property.
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Description

technical field

[0001] The invention relates to lithium-ion battery negative electrode material technology, in particular to an aluminum-tin alloy thin film for lithium-ion battery negative electrodes and a preparation method thereof. Background technique

[0002] Lithium-ion batteries have become one of the important new energy sources in the 21st century. They are widely used in various portable electronic products and electric tools, and are expected to become one of the energy supplies for hybrid vehicles and pure electric vehicles in the future. The negative electrode material is one of the key factors for the overall performance of lithium-ion batteries. Although the current commercial carbon negative electrode materials have good cycle performance, due to their low specific capacity (theoretical specific capacity 372mAh / g) and poor The rate discharge performance is far from meeting the needs of future high-capacity and long-life electronic equipment.

[0003] In rece...

Claims

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