The composite current collector is a sandwich structure of "metal conductive layer PET/PP/PI polymer material support layer metal conductive layer".
Using polymer insulation resin PET/PP and other materials as the "sandwich" layer, metal aluminum or metal copper is deposited on both sides.
From a structural perspective, the current mainstream composite copper foil products have a PET/PP base film thickness of 4.5 μ m in the middle and a double-sided copper plating layer thickness of 1 μ m, with a total thickness of 6.5 μ m.
The composite aluminum foil uses PET material as the base film, with a product thickness of 8 μ m, of which the substrate PET is about 6 μ m.
By using high-density, lightweight, and low-cost polymer materials to replace some metal materials in the current collector, the energy density of lithium batteries can be effectively improvedSafety and cost reduction.