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

Inactive Publication Date: 2009-01-07
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, when inactive materials are introduced, although the cycle performance is greatly improved, there is a problem that the electrode capacity is reduced.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The pure Sn single target with a size of Φ40mm×3mm (purity 99.9%) is used, and the initial pressure in the sputtering chamber before sputtering is 1.0×10 -4 Pa. At room temperature, argon gas was introduced so that the sputtering pressure in the sputtering chamber was 3.0 Pa. The power of the radio frequency power supply is adjusted to 200W, and a pure Sn film is deposited on the copper foil, and the deposition time is 10 minutes.

[0030] The prepared thin film electrodes were assembled into CR2016 button cells according to the method described above. Electrochemical tests show that the initial charge capacity of the Sn thin film electrode prepared according to the magnetron sputtering method of the present invention is 660mAh / g, and the discharge capacity is 570mAh / g, and the capacity remains at 550mAh / g after 30 cycles, and the capacity retention was 83%, and the charge and discharge efficiency was maintained at 90%.

[0031] X-ray diffraction phase analysis was c...

Embodiment 2

[0033] The pure Sn single target with a size of Φ40mm×3mm (purity 99.9%) is used, and the initial pressure in the sputtering chamber before sputtering is 1.0×10 -4 Pa. At room temperature, argon gas was introduced so that the sputtering pressure in the sputtering chamber was 0.1 Pa. Adjust the power of the DC power supply to 10W, and deposit a pure Sn film on the copper foil, and the deposition time is 30 minutes.

[0034] The prepared thin film electrodes were assembled into CR2016 button cells according to the method described above. Electrochemical tests show that the first charge capacity of the Sn thin film electrode prepared according to the magnetron sputtering method of the present invention is 781mAh / g, the first discharge capacity is 500Ah / g, and the capacity remains at 100mAh / g after 30 cycles, and the capacity remains The rate was 13%, and the charge and discharge efficiency was maintained at 90%.

Embodiment 3

[0036] The AlSn alloy target with a size of Φ40mm×3mm and an element mass ratio of Al:Sn=1:3 (purity of 99.95%) was used, and the initial pressure in the sputtering chamber before sputtering was 1.0×10 -4 Pa. At room temperature, argon gas was introduced so that the sputtering pressure in the sputtering chamber was 3.0 Pa. At room temperature, under the condition of argon atmosphere, the power of the radio frequency power supply is adjusted to 200W, and the AlSn thin film is deposited on the copper foil, and the deposition time is 10 minutes.

[0037] The prepared thin film electrodes were assembled into CR2016 button cells according to the method described above. Electrochemical tests show that the initial charge capacity of the AlSn alloy film electrode prepared according to the magnetron sputtering method of the present invention is 905mAh / g, and the discharge capacity is 698Ah / g, and the capacity remains at 768mAh / g after 30 cycles, and the capacity remains The rate was ...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/04C23C14/34C23C14/06C22C13/00C22C21/00
CPCY02E60/10
Inventor 余洪文
Owner SOUTH CHINA NORMAL UNIVERSITY
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