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Aluminium hardness foil for cell current collector

A technology of aluminum hard foil and battery set, which is applied in the direction of battery electrodes, electrode carriers/current collectors, circuits, etc., can solve the problems of unsatisfactory use of batteries, stop of production lines, large resistance, etc., to prevent foil breakage and prevent failures , the effect of low resistance

Inactive Publication Date: 2014-03-26
KOBE STEEL LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] However, in processes such as crimping and cutting of the electrode material production line, even if the strength is high, if the elongation is small, the foil is in a relatively brittle state, and the foil may be broken on the production line, and the production line may stop. The problem of such a failure, although the strength is important, the elongation is also important
On the other hand, an alloy foil material to which a large amount of Mn has been added for high strength has a high resistance as disclosed in Non-Patent Document 2, so it is also not ideal for use as an assembled battery.

Method used

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  • Aluminium hardness foil for cell current collector

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Embodiment

[0092] As mentioned above, the form for carrying out this invention was demonstrated, and the Example which confirmed the effect of this invention is demonstrated concretely below in contrast with the comparative example which does not satisfy the requirement of this invention. In addition, this invention is not limited to this Example.

[0093] 〔For test material production〕

[0094] (Invention Example No.1-9, Comparative Example No.10-20)

[0095] Aluminum having the composition shown in Table 1 was melted and cast to form an ingot, and the ingot was subjected to face cutting and then subjected to a homogenization heat treatment at 360 to 650° C. for 2 to 4 hours. The homogenized ingot was hot-rolled and cold-rolled, intermediate annealed, and then cold-rolled to a thickness of 15 μm to form an aluminum foil. The conditions of intermediate annealing and cold rolling are shown in Table 1.

[0096] It should be noted that in the case of continuous annealing (CAL), the heati...

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Abstract

The invention provides an aluminium hardness foil for a cell current collector, and the aluminium hardness foil has certain intensity, is excellent in elongation, and low in resistance; the aluminium hardness foil is characterized by comprising the following elements: 1.4-1.7 mass % of Fe; 0.1-0.5 mass % of Cu; Si with percentage under 0.4mass%; resting content is formed by Al and inevitable foreign matters. The size of the subgrain is under 0.8 micron in the thickness direction, and under 45 micron in a rolling direction.

Description

technical field [0001] The present invention relates to an aluminum rigid 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. The electrode material of such a lithium ion secondary battery consists of a positive electrode material, a separator, and a negative electrode material. In addition, the production of the positive electrode material is carried out by coating about 100 μm thick LiCoO on both sides of a 15 μm thick aluminum foil (or aluminum alloy foil) 2 etc., dry to remove the solvent in the coated active material, perform crimping for increasing the density of the active material, and go through incision and cutting processes. As a material for the current collector, for example, a high-purity aluminum foil material as discl...

Claims

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Application Information

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IPC IPC(8): H01M4/64H01M4/66C22C21/00
CPCC22C21/12H01M4/662Y02E60/10H01M4/00H01M4/66
Inventor 伊原健太郎梅田秀俊金田大辅中山大辅
Owner KOBE STEEL LTD
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