Aluminum foil for lithium ion battery, micro-porous aluminum foil, and preparation method of micro-porous aluminum foil

A lithium-ion battery and aluminum foil technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of reducing the contact resistance of aluminum oxide foil and reducing the mechanical strength of aluminum foil, so as to improve the activity of lithium ions, increase the elongation, and high yield The effect of intensity
CN108232199AInactive Publication Date: 2018-06-29산시우테하이머뉴매테리얼스테크놀러지컴퍼니리미티드
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
산시우테하이머뉴매테리얼스테크놀러지컴퍼니리미티드
Publication Date
2018-06-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an aluminum foil for a lithium ion battery, a micro-porous aluminum foil, and a preparation method of the micro-porous aluminum foil. The aluminum foil comprises 0.05-0.07 wt%of Mg, 0.08 wt% or less of Si, 0.2 wt% or less of Fe, 0.03 wt% or less of Ga, 0.04 wt% or less of Cu, 0.04 wt% or less of Zn, 0.05 wt% or less of V, 0.03 wt% or less of Ti and 99.7 wt% of aluminum. The micro-porous aluminum foil is prepared through adopting a chemical corrosion technology; 300-6000 through holes and / or blind holes with the diameter being 6-12 [mu]m are distributed in per square centimeter of the micro-porous aluminum foil; and a defined component composition has a higher yield strength than existing series of aluminum alloys, and makes formed micro-pores have small and uniformapertures in the subsequent chemical corrosion process, and each of through holes and the blind holes is in circular arc transition with a material body, so the stress concentration is reduced, mechanical properties are enhanced, electrical properties are not weakened, and the micro-porous aluminum foil can be applied to the lithium battery.
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Description

technical field

[0001] The invention belongs to the technical field of lithium battery material manufacturing, and in particular relates to an aluminum foil for a lithium ion battery, a microporous aluminum foil and a preparation method of the microporous aluminum foil. Background technique

[0002] New materials and clean energy are both key development directions at the national level. Lithium-ion batteries are currently the most widely used energy storage cells in energy storage technology. Improving the energy storage density of cells is the goal pursued by the world. The energy density of cells is The improvement mainly depends on the development and progress of its positive and negative electrode materials, but it is also related to the progress of the positive and negative electrode current collectors, positive and negative electrode binders, electrolytes and separators of lithium-ion batteries.

[0003] The current collector used in the positive electrode of lithium-...

Claims

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