Lithium copper foil As the negative collector of lithium battery, it accounts for 5% - 8% of the cost of lithium battery, and is an important lithium battery material.

Copper foil not only acts as the carrier of negative active material in lithium battery, but also acts as the collector and transmitter of negative electron flow Electrolytic copper foil The tensile strength, extensibility, compactness, surface roughness, thickness uniformity and appearance quality of lithium ion batteries have a great impact on the manufacturing process of negative electrodes and the electrochemical performance of lithium ion batteries.

The general thickness of lithium copper foil is usually 7 to 20 μ M. At present, the thickness of copper foil equipped for new energy vehicles is 6-12 μ m. The weight of copper foil of the whole vehicle is more than 10kg. The smaller the thickness of lithium battery copper foil, the lighter the weight of the battery will be. At the same time, thinner lithium copper foil also means smaller resistance, and the performance of the battery will be improved.

Therefore, reducing the quality of copper foil on batteries, reducing the cost of copper foil raw materials, and providing higher energy density become the key to copper foil for power lithium batteries. It is a big trend to use more light and thin lithium copper foil in the future.