Electrode current collector material of lithium ion battery and preparation method thereof

An electrode current collector, lithium-ion battery technology, applied in battery electrodes, electrode carriers/current collectors, circuits, etc., can solve the problems of battery safety performance hazards, shorten the electrode service life of lithium-ion batteries, and limit applications, and achieve enhanced Work safety performance, low cost, small effect of material deformation and damage

Inactive Publication Date: 2011-01-26
CHANGDE LYRUN MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the electrode current collector materials of lithium-ion batteries generally use metal copper foil for the negative electrode, and metal aluminum foil for the positive electrode to increase the conductivity. However, in the actual working process of the battery, it is easy to grow on the surface of the metal copper foil or aluminum foil and the plate material. The same metal dendrites, on the one hand, cause great harm to the safety performance of the battery, and on the other hand, shorten the service life of the electrodes of the lithium-ion battery, thus limiting its application in the field of power batteries

Method used

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  • Electrode current collector material of lithium ion battery and preparation method thereof
  • Electrode current collector material of lithium ion battery and preparation method thereof
  • Electrode current collector material of lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In the magnetron sputtering equipment, the high-purity copper foil with a thickness of 0.01mm is used as the sputtering substrate, the graphite target is used as the sputtering target, filled with argon gas, and the vacuum degree of the working room is 1.0*10 -2 Pa, sputtering power 2.5Kw, the distance between the sputtering target and the copper foil substrate is 45mm, the speed of the copper foil substrate is 15m / min, deposit a carbon layer on the surface of the copper foil, the thickness of the deposited layer is 0.003mm and then heat-treating the carbon-coated copper foil material in a heat-treating furnace containing a mixed atmosphere of hydrogen and nitrogen at a heat-treating temperature of 400° C. for 6 hours.

[0022] A copper foil covered with a carbon layer was prepared by the above method, and the thickness of the carbon layer was 0.003 mm. The carbon-coated copper foil of this embodiment and the common copper foil were respectively used as the negative ele...

Embodiment 2

[0025] In the magnetron sputtering equipment, the high-purity aluminum foil with a thickness of 0.015mm is used as the sputtering substrate, the graphite target is used as the sputtering target, filled with argon gas, and the vacuum degree of the working room is 3.0*10 -2 Pa, the sputtering power is 4.5Kw, the distance between the sputtering target and the aluminum foil substrate is 40mm, the walking speed of the aluminum foil substrate is 20m / min, a carbon layer is deposited on the surface of the aluminum foil, and the thickness of the deposited layer is 0.005mm; The carbonized aluminum foil material is heat treated in a vacuum heat treatment furnace at a heat treatment temperature of 500°C for 4 hours.

[0026] An aluminum foil covered with a carbon layer was prepared by the above method, and the thickness of the carbon layer was 0.005 mm. The carbon-coated aluminum foil of this embodiment and the ordinary aluminum foil were respectively used as the positive electrode curren...

Embodiment 3

[0029] The carbon-coated copper foil of Example 1 is used as the negative electrode current collector, and the carbon-coated aluminum foil of Example 2 is used as the positive electrode current collector. The rest of the process is the same as the existing lithium-ion battery manufacturing process, and an improved lithium-ion battery is prepared. Under the same conditions Next, test the capacity of this improved lithium-ion battery and ordinary lithium-ion battery respectively, the test results are shown in the attached image 3 .

[0030] Depend on image 3 It can be seen that the gram capacity of the improved lithium-ion battery is significantly higher than that of the ordinary lithium-ion battery.

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Abstract

The invention provides an electrode current collector material of a lithium ion battery and a method for preparing the material. The method comprises the following steps of: coating a carbon layer on the surface of a copper foil or an aluminum foil, wherein the thickness of the coated carbon layer is 0.003-0.015mm; and depositing the carbon layer on the surface of the copper foil or the aluminum foil by utilizing a physical vapor deposition method, and then carrying out thermal treatment. While ensuring the conductive property of the material as a current collector, the material improves the chemical property of easy oxidization of the foil in the working process of the battery, enhances the corrosion resisting property of the foil, and can effectively prevent a metal dendritic crystal produced by the lithium ion battery in the working process due to reaction, increase the safety performance of the battery, reduce the internal resistance of the battery and effectively prolong the service life of the battery. The process has the advantages of low temperature, less distortion and damage on the material, low energy consumption, less pollution and lower cost.

Description

[0001] technical field [0002] The invention relates to a battery electrode collector material and a preparation method, in particular to a lithium ion battery electrode collector material and a preparation method. Background technique [0003] At present, the electrode current collector materials of lithium-ion batteries generally use metal copper foil for the negative electrode, and metal aluminum foil for the positive electrode to increase the conductivity. However, in the actual working process of the battery, it is easy to grow on the surface of the metal copper foil or aluminum foil and the plate material The same metal dendrites, on the one hand, cause great harm to the safety performance of the battery, and on the other hand, shorten the service life of the electrodes of the lithium-ion battery, thus limiting its application in the field of power batteries. Contents of the invention [0004] The present invention aims to provide a current collector material that c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/139
CPCY02E60/122Y02E60/10
Inventor 朱济群谢红雨龙文贵陈红辉刘占伟夏健康
Owner CHANGDE LYRUN MATERIAL
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