Due to its special use conditions, current collector aluminum foil has very strict requirements on its various technical indicators. It is the leader in the aluminum foil family. Some specific requirements are as follows:
Foreign matter: Lithium batteries must have high safety during use, so foreign matter (impurities) on the surface should be strictly controlled. If foreign matter control is not carried out, it cannot be used as a qualified battery foil. The foreign matter can be aluminum powder or magnetic substances ( iron powder), and other substances. The entire production process must be protected to reduce the possibility of introducing foreign matter. In the finished product process, a device for detecting foreign matter must be set up and accurately measured. Foreign matter should be ≤50mg/300,000m2.
