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Aluminium hard foil for battery collector

A technology of aluminum hard foil and battery set, which is applied in the direction of battery electrodes, electrode carriers/current collectors, secondary batteries, etc., can solve the problems of working line stop, foil breaking, and low elongation rate, so as to prevent the production line Stop, prevent foil breakage, excellent elongation effect

Active Publication Date: 2011-09-28
KOBE STEEL LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] However, in the process of pressing and cutting the electrode material production line, even if the strength is high but the elongation rate is low, the foil material will be in a brittle state, and the foil material will be broken on the production line, causing the problem of line stoppage. Therefore, While emphasizing strength, elongation is also required
On the other hand, an alloy foil material to which a large amount of Mn is added for high strength, as described in Non-Patent Document 2, has a problem that it is not suitable for use as an assembled battery because of its high electrical resistance.

Method used

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  • Aluminium hard foil for battery collector
  • Aluminium hard foil for battery collector
  • Aluminium hard foil for battery collector

Examples

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Embodiment

[0077] As mentioned above, the form for carrying out this invention was demonstrated. Hereinafter, a concrete description will be given by comparing Examples that achieve the effects of the present invention and Comparative Examples that do not satisfy the conditions of the present invention. In addition, this invention is not limited to this Example.

[0078] (for test material production)

[0079] (Example No.1-6, Comparative Example No.7-16)

[0080] Aluminum having the composition shown in Table 1 was melted and cast as an ingot, and the ingot was face-cut, and then subjected to a homogenization heat treatment at 540° C. for 4 hours. The homogenized ingot was hot-rolled and then cold-rolled, then intermediate annealed, and then single-roll rolled to a thickness of 15 μm to form an aluminum foil. The conditions of the intermediate annealing are annealing temperature of 450° C. in a continuous annealing furnace, heating rate of 10° C. / s, cooling rate of 20° C. / s, and hold...

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Abstract

The invention provides an aluminium hard foil for a battery collector, which has a strength of a certain degree and good stretching rate. The aluminium hard foil for a battery collector with low resistance has 0.2-0.7 mass% of Fe, 0.1-0.5mass% of Mn. Si is controlled to be under 0.2mass%, and the remain is A1 and inevitable impurities and the purity is over 99.0mass%. The thickness of the aluminium hard foil is 9-20Mum, the amount of subgrains in the thickness direction is over 30, and the tensile strength is over 200MPa and below 270MPa and the stretching rate is over 4.0%.

Description

technical field [0001] The present invention relates to a pure 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 tools such as mobile phones and notebook computers. The battery material of such a lithium ion secondary battery consists of a positive electrode material, a separator, and a negative electrode material. Moreover, the production of the positive electrode material is to coat LiCoO with a thickness of about 100 μm on both sides of an aluminum foil (or aluminum alloy foil) for a current collector with a thickness of about 15 μm. 2 In order to remove the solvent in the coated active material, dry the active material, press to increase the density of the active material, and perform incision and cutting processes. As the current collector material, for example, a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00H01M4/66H01M10/24
CPCY02E60/12Y02E60/124Y02E60/122Y02E60/10C22C21/00H01M4/662H01M10/0525
Inventor 星野晃三伊原健太郎
Owner KOBE STEEL LTD
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