Composite current collector is a new material that replaces pure metal foil (aluminum foil for positive electrode and copper foil for negative electrode) with a sandwich structure of "metal/polymer material/metal" stacking. The middle polymer layer is mainly made of lighter and cheaper materials such as PET and PP, which can replace metals with a thickness of about 4 microns.

1. Improving safety: Composite current collectors enhance the safety of lithium batteries by suppressing dendrite formation, short-circuit effects, and diffusion.

2. Economy: Compared to traditional methods, composite current collectors reduce copper usage by about 69%, thereby reducing costs. The weight of composite current collectors is also reduced by about 55%, effectively reducing the overall weight of the battery and improving energy density.

3. Strength source products are applied in the preparation of composite current collector coatings.