Aluminium alloy foil for lithium ion battery positive current collector and manufacturing method thereof

A technology for positive current collectors and lithium-ion batteries, applied in the direction of electrode carriers/collectors, etc., can solve the problems of rising resistivity, increasing the internal resistance of lithium-ion batteries, reducing the input energy of lithium-ion batteries, etc., to achieve lower resistivity, high The effect of intensity

Active Publication Date: 2012-11-21
CHINA ALUMINUM INT ENG CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] An increase in the degree of alloying of materials will lead to an increase in resistivity. As an aluminum foil for lithium-ion bat

Method used

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  • Aluminium alloy foil for lithium ion battery positive current collector and manufacturing method thereof
  • Aluminium alloy foil for lithium ion battery positive current collector and manufacturing method thereof
  • Aluminium alloy foil for lithium ion battery positive current collector and manufacturing method thereof

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Effect test

Embodiment 6

[0053] In Example 6, the resistivity exceeds the scope of the present invention because the Mn content exceeds the upper limit.

[0054] In Examples 7, 8, and 9, because the content of Mn element is lower than the lower limit, the strengthening effect of Mn element is insufficient, and cannot meet the strength requirement of the present invention.

Embodiment 10

[0055] In Example 10, since the Mn content exceeded the upper limit, the strength was too high, the rollability of the aluminum foil was lowered, and an aluminum foil of 5 to 30 μm could not be rolled.

[0056] Table 2 is the evaluation of the manufacturing method, as follows:

[0057] In the embodiment, the homogenization annealing and intermediate annealing processes of serial numbers 11-15 are within the scope of the present invention, so the tensile strength and elongation meet the requirements of the present invention. On the other hand, serial number 16-19 in the comparative example does not satisfy the scope of the present invention, so cause following result:

Embodiment 25

[0074] In Example 25, the resistivity exceeded the range of the present invention because the Mn content exceeded the upper limit.

[0075] Examples 26, 27, and 28 cannot meet the strength requirements of the present invention because the content of Mn element is lower than the lower limit, and the strengthening effect of Mn element is insufficient.

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Abstract

The invention relates to an aluminium alloy foil for a lithium ion battery positive current collector and a manufacturing method thereof. The aluminium alloy foil comprises 0.1-0.7wt% of Fe, 1.1-1.6wt% of Mn, less than 1.8wt% of Fe+Mn, 0.1-0.3wt% of Si, less than 0.02wt% of Ti, less than 0.004wt% of B, and the balance consisting of Al and inevitable impurities. The manufacturing method comprises conducting alloy smelting, melt purification, casting, carrying out face milling and uniformization treatment on keelblook, conducting hot rolling and cold rolling, conducting intermediate annealing and aluminium foil rolling to obtain a hard aluminium foil with the thickness of 5-30 mum, wherein two-stage uniformization system at high temperature and low temperature can be used, the corresponding intermediate annealing temperature of the cold-rolled sheet is 300-340 DEG C, and the temperature is kept for 1-25 h; or single-stage uniformization system at high temperature is used, the corresponding intermediate annealing temperature of the cold-rolled sheet is 340-400 DEG C, and the temperature is kept for 1-40 h. According to the invention, the resistivity is reduced while the high intensity is guaranteed.

Description

technical field [0001] The invention relates to an aluminum alloy foil for a positive electrode collector of a lithium ion battery and a manufacturing method thereof, belonging to the technical field of nonferrous metals. Background technique [0002] Due to the advantages of high working voltage, high energy density, no memory effect, long cycle life and no pollution, lithium-ion batteries have become the main power source of various electronic products. With the popularity of plug-in hybrid electric vehicles and pure electric vehicles worldwide , Lithium-ion batteries are increasingly used in the field of electric vehicles. [0003] The aluminum foil of the positive electrode current collector mainly plays the role of conducting electricity and supporting the positive electrode material in the lithium-ion battery, and does not directly contribute to the capacity of the lithium-ion battery. Therefore, the thickness of the aluminum foil can be reduced by increasing the stren...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22F1/04H01M4/66
CPCY02E60/12Y02E60/10
Inventor 陈伟赵丕植陈星霖
Owner CHINA ALUMINUM INT ENG CORP
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