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Capacitor Grade Aluminum Foil
The battery aluminum foil is used as the current collector of the lithium ion battery. Under normal circumstances, the lithium-ion battery industry uses rolled aluminum foil as the positive electrode current collector.
The thickness of the rolled foil varies from 10 to 50 microns. Commonly used pure aluminum foils for lithium batteries have various alloy grades such as 1060, 1050, 1145, 1235, etc., and are in -O, H14, -H24, -H22, -H18 and other states.
Lithium batteries usually have two appearances: cylindrical and square. The inside of the battery adopts a spiral wound structure and is made of a very fine and highly permeable polyethylene film separator between the positive and negative electrodes.
The positive electrode includes a current collector composed of lithium cobalt oxide (or lithium nickel cobalt manganate, lithium manganate, lithium iron phosphate, etc.) and aluminum foil. The negative electrode is composed of a current collector composed of graphitized carbon material and copper foil.
Requirements for aluminum foil: the surface of the first aluminum foil is uniform in color, clean, and flat, without obvious roll marks, pitting, pinholes, or corrosion marks;the surface of the second aluminum foil has no rolling defects such as creases, mottling, bright lines, etc.;The surface of the third aluminum foil has no color difference;the fourth surface has no oil, no serious oil odor, and no visible oil spots.
Requirements for appearance: First, the aluminum foil coil is wound with moderate tightness, the end surface is flat and clean, and the edge is smooth;
The latest research in the lithium-ion battery industry has found that by etching and roughening the surface of the aluminum (Al) alloy foil used as the positive collector of the lithium-ion rechargeable battery, the charge and discharge characteristics of the battery can be improved.
On the basis of fully considering the thermal conductivity, electrical conductivity and mechanical strength of aluminum foil, it adopts special blanks and is manufactured in a clean dust-removing plant environment through a high-precision imported rolling mill with an online profile roll and a Siemens control system.
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