| Aluminum and aluminum alloy battery foil is the collector of lithium-ion batteries. Generally, the lithium-ion battery industry uses rolled aluminum foil as the positive electrode of the battery and aluminum foil as the negative electrode collector. The thickness of the rolled foil ranges from 10 to 50 microns. Commonly used lithium battery pure aluminum foils include various alloy grades such as 1060, 1050, 1145, and 1235 and have states such as O, H14, H24, H22, and H18.
Battery foil is mainly composed of 1060, 1070, 1100, 1235, 3003, and other alloys, and the mainstream thickness specification is 10-20μm. Battery Aluminum Foil Performance Requirements Thickness: The thinnest thickness of battery foil has reached 8μm, and the thickness deviation is required to be small, generally within ±4%, and some battery manufacturers require within ±2%.
Surface quality: No pitting with a diameter >1mm is allowed on the surface, and pitting of 0.5mm~1mm should be less than 3/m2, and there should be no convex spots or bright spots on the dark surface.
Surface wetting tension: Generally, users require the surface wetting tension to be between 30-32 dyn, but some sensitive materials require higher dyne values.
Edge cutting quality: The edge cutting quality should be high, and there should be no cracks and burrs.
Mechanical properties: While thinning, its tensile strength must be improved simultaneously; otherwise, the burst resistance cannot meet the requirements. The limit of industrial pure aluminum processing hardening is 310 N/mm2, and the tensile strength of battery foil is mostly between 190 and 280 N/mm2. | Alloy | Temper | Thickness | Width | Usages | | 1235 | H18 | 0.014/0.015/0.016 mm | 280-1200 mm | Battery foil | | 1060/1070 | H18 | 0.014/0.015/0.016 mm | 280-1200 mm | Battery foil | |
