Although 8021 aluminum foil as battery collector has many advantages, there are still a series of problems to be solved in the process of application. Firstly, the rigidity of 802 aluminum foil leads to the limitation of its contact area with cathode materials, which affects the internal resistance of cathode wafers; secondly, the bonding strength of 802 aluminum foil is limited with binder and active substance, and the change of electrode volume in cyclic charging and discharging leads to the loosening of particle bonding and easy to fall off, which accelerates the rapid decline of the battery capacity and cycling life; lastly, the oxidized decomposition products of the electrolyte trigger the electrochemical reaction on the surface of aluminum foil, which leads to the corrosion of the aluminum foil. Finally, the oxidized decomposition products of electrolyte cause electric reaction on the surface of aluminum foil, which leads to corrosion of aluminum foil. In order to overcome these problems, aluminum foil must be modified.
Mechanical Properties of Aluminium Foil Alloy 8021
| Tensile strength
σb (MPa) |
Elongation
δ10 (%) |
Cupping test value (mm) | Note |
| 90-110 | 13-18 | 6.2-7.3 | Erichsen Test |
Techical Parameters of Aluminium Foil Alloy 8021
| Alloy No. | Si | Fe | Cu | Mn | Mg | Zn | Others | Al |
| 8021 | ≤0.15 | 1.2≤ | ≤0.05 | ≤0.05 | ≤0.05 | ≤0.05 | ≤0.05 | REMAIN |
| ≤1.7 | ||||||||
| 8021 aluminium foil | ||||||||
| Products | Type | Temper | Thickness(mm) | Width(mm) | Length(mm) | |||
| 8021 Battery Film Foil | Bare,Mill Finish | O /H*2 /H*4 | 0.035-0.055 | 100-1600 | Customize | |||
| 8021 Pharmaceutical Foil | H14 /H18 | 0.018-0.2 | 100-1600 | Customize | ||||
| 8021 Packaging Foil | O /H22 /H24 | 0.018-0.2 | 100-1600 | Customize | ||||
Charcoal surface coating is the main modification method, which can significantly improve the internal resistance of aluminum foils.802 The main modification methods for aluminum foils include surface treatment (e.g., chemical etching, electrochemical etching, DC anodizing, corona treatment), conductive coatings (e.g., carbon-coated, graphene-coated, carbon nanotubes-coated, composite coatings), 3D porous structures (e.g., foams, nano-ribbons, nano-cones, fiber braids), and composite modifications. and composite modification treatments. These methods play a key role in improving the performance of aluminum foils and enhancing the connectivity of electrode materials.
