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Perforated aluminum foil

A through-hole, aluminum foil technology, applied in the field of aluminum foil with through-holes, can solve the problems of difficult crystallization, consistent orientation, inability to use current collectors, etc., and achieve high strength

Inactive Publication Date: 2014-03-19
TOYO ALUMINIUM KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, aluminum foil for electrolytic capacitors usually has a thickness of 100 μm or more, and cannot be used as a current collector for storage as described above.
In addition, when the thickness of the aluminum foil is reduced, it is difficult to align the crystal orientation

Method used

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  • Perforated aluminum foil
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  • Perforated aluminum foil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] After preparing a melt having a composition shown in Table 1, an ingot was obtained by solidifying the melt. Then, the above-mentioned ingot was subjected to a homogenization treatment at 500° C. for 10 hours. Thereafter, the ingot was rolled to a thickness of 130 μm by performing hot rolling (at a temperature of 400° C.) and cold rolling. Two sheets obtained in this way were prepared, and cold rolling (parallel rolling or interlayer rolling) was further performed in a state where the two were stacked to obtain foils with a total thickness of 130 μm (each 65 μm). After performing intermediate annealing at 250° C. for 8 hours, cold rolling was further performed to obtain foils with a total thickness of 100 μm (each 50 μm).

[0096] After the two foils were separated and washed with an organic solvent-based cleaning agent (isopropylene), annealing was performed at 530° C. for 10 hours in argon. Before the etching treatment, the average roughness Ra and the foil thicknes...

Embodiment 2～10

[0099] Aluminum foils having through-holes were produced in the same manner as in Comparative Example 1, except that the melt composition and production conditions were changed as shown in Table 1, and the chemical etching time for an aluminum foil with a foil thickness of 30 μm was set to 200 seconds.

[0100] Table 1

[0101]

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Abstract

Disclosed is a perforated aluminum foil which has high strength and a plurality of through holes, since the perforated aluminum foil has a high cube orientation occupancy in spite of a thin foil thickness. Specifically disclosed is a perforated aluminum foil which is composed of 5-80 ppm by weight of Fe, 5-100 ppm by weight of Si and 10-100 ppm by weight of Cu, with the balance made up of Al and unavoidable impurities. The perforated aluminum foil is characterized in that: (1) the foil thickness is not more than 50 µm; (2) the foil has a plurality of through holes penetrating therethrough from the front surface to the back surface; and (3) the ratio of the vertical through hole occupancy (c) (%) to the foil thickness (t) (µm) in the perforated aluminum foil, namely c / t is not less than 1.4.

Description

technical field [0001] The present invention relates to a novel aluminum foil having through holes. More specifically, it relates to an aluminum foil having through holes used for current collectors such as lithium batteries, lithium capacitors, and electric double-layer capacitors. Background technique [0002] In order to increase the energy density of lithium-ion batteries, lithium-ion capacitors, electrical double-layer capacitors, etc., higher voltages are required. In order to increase the energy density, it is preferable to lower the potential of the negative electrode by using the storage (Japanese: プレドプ) technology. In order to perform storage efficiently, it is necessary to provide through holes in the current collector. Lithium can be reversibly moved through the through-holes of the current collector, whereby lithium can be supported on the negative electrode active material. [0003] Known methods for producing a current collector having through holes include...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00H01G11/68H01M4/66H01G11/70
CPCY02E60/12C22C21/02H01G11/68H01M4/70C22C21/14H01G9/016C22C21/00H01M4/661Y02E60/13H01G11/70H01G11/74Y02E60/10
Inventor 小西敦志目秦将志
Owner TOYO ALUMINIUM KK