Why is 4.5 m copper foil a good tensile strength?

Combined additives contribute to small Rz (1.74 µm) and high tensile strength (435.65 MPa). The prepared 4.5 µm copper foil shows much higher gravimetric energy density than that of the 9 µm candidate, and also outperforms the commercial 4.5 µm counterpart.

Why is electrolytic copper foil important?

With the global proliferation of 5G technology, advancing electronic interconnection technologies has become critically important. The development of high-quality electrolytic copper foils, essential for efficient signal transmission, has garnered considerable attention.

Can ultra-thin copper foil be used as a current collector?

Adopting ultra-thin copper foil as the current collector is one of the most important strategies for improving the gravimetric energy density of lithium-ion batteries (LIBs), however, stumbled by the quality-control of physicochemical properties for ultra-thin foils.

What is the energy density of 4.5 m copper foil?

The prepared 4.5 µm copper foil presents a gravimetric energy density of 323.19 Wh/kg, much higher than that of the 9 µm candidate (205.81 Wh/kg) and the commercial 4.5 µm counterpart (310.48 Wh/kg). Copper resource savings and carbon footprint reduction are confirmed by adopting ultra-thin copper foils.

What is the tensile strength of extra-thin copper foil?

This foil achieved a high energy density of 323.19 Wh·kg −1 as a collector for LIBs, but its tensile strength was only 435.65 MPa. Despite the high energy density exhibited by the aforementioned extra-thin copper foil as a collector for LIBs, its tensile strength remains at a moderate level.

Why does copper foil have a tensile stress?

This factor makes a minor contribution to the internal stress of the copper foil at room temperature. Furthermore, during PC electrodeposition, tensile stress arises in the copper foil while the current is on, and during the current off period, this stress facilitates the movement of atoms in the deposited layer.