PET negative electrode composite copper foil

Enhancing Safety

Thermal runaway protection: When there is an internal short circuit or thermal runaway in the battery, the PET layer and the flame-retardant structure formed by magnetron sputtering can act like an "fuse" and quickly melt, cutting off the current and preventing the spread of heat, thereby reducing the risks of combustion, fire or explosion.

Puncture-resistant design: After the outer layer copper breaks, a 1μm thin copper layer is difficult to penetrate the separator, avoiding internal short circuits.

Increasing Energy Density

Lightweighting: The density of PET (approximately 1.38g/cm³) is much lower than that of copper (8.96g/cm³). Replacing part of the copper with PET can significantly reduce the weight of the current collector. According to calculations, PET copper foil can reduce the overall battery weight by approximately 60%, thereby increasing the energy density of the battery by 5%-10%, directly helping electric vehicles extend their range.

Cost Reduction

Reducing copper usage: The copper usage of PET copper foil is reduced by about 2/3. The theoretical calculation shows that its raw material cost can be reduced by more than 40% compared to traditional 6μm copper foil, and the total cost of lithium batteries can be reduced by approximately 3%. After scaling up, the cost advantage will be more significant.