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Aluminum foil for high ductility lithium ion battery and production method

A lithium ion battery, high elongation technology, applied in the field of lithium ion batteries, can solve the problems of low elongation, broken belt, can not meet the high elongation requirements of aluminum foil, etc., to achieve high elongation and improve mechanical properties.

Active Publication Date: 2021-01-22
XIAMEN XIASHUN ALUMINUM FOIL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the aluminum foils for lithium-ion batteries on the market use 1-series and 3-series alloys. Although the tensile strength is good, the elongation is low, and the problem of tape breakage is prone to occur in the coating and rolling processes of battery production, which cannot meet the needs of lithium batteries. High elongation requirements for aluminum foil in the process of continuous thinning and increasing energy density

Method used

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  • Aluminum foil for high ductility lithium ion battery and production method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] According to the composition of the specified weight percentage in Table 1, the molten solution suitable for the aluminum foil of the positive electrode current collector of the lithium ion battery is obtained: Si: 0.078%; Fe: 1.528%; Cu: 0.0067%; Mn: 0.0256%; Mg: 0.0008%; Zn: 0.016%; Ti: 0.0208%; Al: 98.28%; the single weight content of other impurities is not more than 0.03%, and a finished aluminum foil with a thickness of 15 μm is produced. The specific test results of the elongation of the obtained aluminum foil are shown in Table 1.

Embodiment 2

[0027] According to the composition of the specified weight percentage in Table 1, the molten solution suitable for the aluminum foil of the positive electrode current collector of the lithium ion battery is obtained: Si: 0.086%; Fe: 1.505%; Cu: 0.0055%; Mn: 0.0284%; Mg: 0.0008%; Zn: 0.019%; Ti: 0.0234%; Al: 98.28%; the single weight content of other impurities is not more than 0.03%, and a finished aluminum foil with a thickness of 15 μm is produced. The specific test results of the elongation of the obtained aluminum foil are shown in Table 1.

Embodiment 3

[0029] According to the composition of the specified weight percentage in Table 1, the molten solution suitable for the aluminum foil of the positive electrode current collector of the lithium ion battery is obtained: Si: 0.077%; Fe: 1.491%; Cu: 0.0051%; Mn: 0.0293%; Mg: 0.0007%; Zn: 0.024%; Ti: 0.0211%; Al: 98.27%; the single weight content of other impurities is not more than 0.03%, and the finished aluminum foil with a thickness of 15 μm is produced. The specific test results of the elongation of the obtained aluminum foil are shown in Table 1.

[0030] Table I

[0031] Si Fe Cu mn Mg Zn Ti Al Elongation first heat 0.078 1.528 0.0067 0.0256 0.0008 0.016 0.0208 98.28 7.19％ second heat 0.086 1.505 0.0055 0.0284 0.0008 0.019 0.0234 98.28 7.26％ third heat 0.077 1.491 0.0051 0.0293 0.0007 0.024 0.0211 98.27 7.23％

[0032] The aluminum foil for lithium ion batteries of the present invention has the advantag...

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Abstract

The invention discloses an aluminum foil for a high ductility lithium ion battery and a production method. The aluminum foil is composed of the following components in percent by weight: 0.07-0.1% ofSi, 1.45-1.55% of Fe, 0.003-0.01% of Cu, 0.025-0.035% of Mn, less than or equal to 0.003% of Mg, less than or equal to 0.03% of Zn, 0.02-0.025% of Ti and the balance Al and inevitable impurities, wherein single weight of impurities is not greater than 0.03%. A production method thereof is disclosed. The production method successively comprises the following steps of performing saw cutting and surface milling on a casted raw material; performing continuous rolling such as hot rolling, cold rough rolling and cold finish rolling after annealing to prepare a blank; and performing edge cutting, foil rolling and edge cutting again on the blank to finally obtain an aluminum foil product. The aluminum foil for the high ductility lithium ion battery produced and prepared by the scheme has the advantage of high ductility and a high quality raw material for continuous reduction of the lithium battery and production of a power battery matrix with high energy density is provided.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an 8021 alloy aluminum foil for a positive electrode collector of a lithium ion battery and a production method thereof. Background technique [0002] Lithium-ion batteries have outstanding advantages such as large specific energy, high cycle stability, low self-discharge rate, no memory effect, clean and pollution-free, etc., and are the secondary battery system with the best comprehensive performance at present; It has completely replaced nickel-cadmium and nickel-metal hydride batteries, and large-capacity lithium-ion power batteries also have a strong momentum to replace lead-acid batteries in aerospace, transportation and other intermittent clean energy storage fields. Lithium-ion batteries use aluminum foil as the positive electrode collector. With the continuous expansion of the lithium-ion battery market, it has become an emerging consumer market...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C1/02C22F1/043H01M4/66H01M4/70H01M10/0525
CPCC22C21/02C22C1/026C22F1/043H01M4/662H01M4/70H01M10/0525Y02E60/10
Inventor 王敬奎林婷婷叶国华
Owner XIAMEN XIASHUN ALUMINUM FOIL