This copper foil is an indispensable component of modern lithium-ion batteries. It serves as the substrate and current conduction pathway for the battery's negative electrode (typically graphite or other active materials).

High quality copper foil has good conductivity, allowing current to flow smoothly in the circuit. Low resistance can reduce energy loss, which is crucial for effectively improving performance. Copper foil is commonly used in printed circuit boards (PCBs) and batteries to provide stable and reliable power.