Distinguishing between copper and aluminum is a commonly used data for negative and positive current collectors.

    Aluminum foil is relatively easy to form an oxide film in both air and electrolyte. At the same time, the nominal and local corrosion of the current collector (such as pitting corrosion) and poor adhesion can increase the resistance of the electrical reaction, increase the internal resistance of the battery, resulting in capacity loss and reduced discharge efficiency.

    In order to reduce the impact caused by these factors, the collected fluid purchased from the market is pre treated (acid alkali etching, corrosion-resistant coating, conductive coating, etc.) to improve its corrosion resistance and adhesion function. Because the nominal adhesion force of the current collector is too small, the electric locality may detach from the current collector, increasing the chemical reaction and having a significant impact on the capacity.

    During the utilization process, copper current collectors decompose to form a layer of insulating corrosion product film. As a result, the internal resistance of the battery increases, and the discharge efficiency decreases during the cycling process, causing capacity loss.

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