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Aluminum alloy hard foil for battery collector

A technology of battery collection and aluminum alloy, which is applied in the direction of battery electrodes, electrode carriers/current collectors, secondary batteries, etc., can solve the problems of production line stop, foil breakage, etc. excellent effect

Active Publication Date: 2011-04-27
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in processes such as crimping and cutting on the electrode material production line, even if the strength is high, if the elongation is low, the foil will be in a brittle state. line stops on such faults

Method used

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  • Aluminum alloy hard foil for battery collector
  • Aluminum alloy hard foil for battery collector
  • Aluminum alloy hard foil for battery collector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] First, an example of an aluminum alloy foil manufactured through a single rolling is exemplified.

[0074] (for test material production)

[0075] (Example No.1-10, Comparative Example No.11-19)

[0076] Aluminum alloys having the compositions shown in Table 1 were melted and cast to form ingots, and after face milling the ingots, homogenization heat treatment was performed at 540° C. for 4 hours. The homogenized ingot is hot-rolled, then cold-rolled, and intermediate annealed. Thereafter, cold rolling was performed under conditions of foil rolling by single rolling until a part was removed to a thickness of 15 μm to obtain an aluminum alloy foil. The conditions of the intermediate annealing are that a continuous annealing furnace is used, the annealing temperature is 450°C, the heating rate is 10°C / sec, the cooling rate is 20°C / sec, and the holding time is 5 seconds. The thickness of the plate (foil texture) after hot rolling is 3.5 mm, and the thickness of the plat...

Embodiment 2

[0107] Next, an example of an aluminum alloy foil manufactured by double-pass rolling will be described.

[0108] (Example No.101-110, Comparative Example No.111-119)

[0109]Aluminum alloys having the compositions shown in Table 3 were melted and cast to form ingots, and after face milling the ingots, homogenization heat treatment was performed at 540° C. for 4 hours. The homogenized ingot is hot-rolled, then cold-rolled, and intermediate annealed. Thereafter, cold rolling was performed under the conditions of foil rolling by overlap rolling until a part was removed to an average thickness of 12 μm to obtain an aluminum alloy foil. The conditions of the intermediate annealing are that a continuous annealing furnace is used, the annealing temperature is 450°C, the heating rate is 10°C / sec, the cooling rate is 20°C / sec, and the holding time is 5 seconds. The thickness of the plate (foil texture) after hot rolling is 3.0 mm, and the thickness of the plate (foil texture) before...

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Abstract

An aluminum alloy hard foil for battery collector comprises the following components: 0.8-1.5wt% of Mn; 0.05-0.20wt% of Cu; 0.3-0.7wt% of Fe, and the balance of Al and inevitable impurity. The thickness of the alminium alloy hard foil for battery collector is 9-20 mu m. More than thirty subgrains are provided in a thickness direction. The tensile strength is 280-350MPa and the extensibility is more than 3.5%. According to the composition, the aluminum alloy hard foil for battery collector has a high strength and excellent extensibility.

Description

technical field [0001] The present invention relates to an aluminum alloy hard foil for a battery current collector used as a positive electrode current collector of a lithium ion secondary battery. Background technique [0002] In recent years, lithium-ion secondary batteries have been used as power sources for mobile devices such as mobile phones and notebook computers. An electrode material of such a lithium ion secondary battery is formed of a positive electrode material, a separator, and a negative electrode material. Furthermore, the manufacture of the positive electrode material is carried out as follows: On both sides of an aluminum foil (or aluminum alloy foil) for a current collector with a thickness of about 15 μm, LiCoO is coated with a thickness of about 100 μm. 2 In order to remove the solvent of the coated active material, the active material is dried, pressed to increase the density of the active material, and then cut and divided. In addition, the drying s...

Claims

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Application Information

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IPC IPC(8): C22C21/00H01M4/66
CPCY02E60/12Y02E60/122Y02E60/10C22C21/00H01M4/662H01M10/0525
Inventor 梅田秀俊伊原健太郎星野晃三金田大辅
Owner KOBE STEEL LTD
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