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Aluminum foil is a hot stamping material that is directly rolled from metal aluminum into thin sheets; copper foil is a kind of anionic electrolytic material, a thin, continuous metal foil deposited on the base layer of the circuit board.
Both aluminum foil and copper foil have good electrical conductivity, forming a stable oxide protective film, soft texture, easy to bond, relatively mature manufacturing technology, and low price. Therefore, copper foil and aluminum foil are the main materials for lithium battery current collectors.
Generally, only aluminum foil can be used for the positive electrode, because the positive electrode potential is high, and the oxide layer of the aluminum foil is denser, which can effectively prevent the current collector from oxidizing. The copper foil is used for the negative electrode and cannot be interchanged. Because copper will undergo a lithium intercalation reaction at high potential, it is not suitable for use in the positive electrode; while the potential of the negative electrode is low, aluminum foil is easy to form an aluminum-lithium alloy.
Aluminum foil has the properties of light weight, good ductility, thin thickness, small mass per unit area, low strength, corrosion resistance, heat resistance, low temperature resistance, good shading, and high barrier properties to water and light. Therefore, it is widely used in the packaging industry. In addition, it will also be used in the heat exchanger of air conditioners, decoration fields, etc.
Copper foil has better ductility, softness, bending resistance and higher strength, and has lower surface roughness and higher density. Mainly used in electromagnetic shielding and related antistatic. In addition, it can also be used in communication equipment, video recorders, industrial computers, etc.
The above is the difference between aluminum foil and copper foil. In the final analysis, the biggest difference is the difference in material. You can choose different products according to your needs.
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