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The process of charging and discharging cycles of lithium-ion battery packs is the process of lithium ions moving back and forth between positive and negative electrode materials through the electrolyte. In the cycling process of lithium-ion battery packs, there are not only oxidation-reduction echoes at the positive and negative electrodes, but also a large number of secondary echoes. If the secondary resonance of lithium-ion batteries can be reduced to a low level, allowing lithium ions to smoothly travel back and forth between the positive and negative electrode materials through the electrolyte, the cycle life of lithium-ion batteries can be extended.

The properties of the positive and negative current collectors can also affect the capacity and cycle life of the battery. The commonly used current collector materials for the positive and negative electrodes of lithium-ion battery packs are aluminum and copper, both of which are easily corroded metal materials. After the current collector is corroded, it forms a passive film, poor adhesion, localized corrosion (pitting), and comprehensive corrosion, which increases the internal resistance of the battery and leads to capacity loss and low discharge efficiency. The adhesion and corrosion resistance can be strengthened through pre-treatment methods such as acid alkali etching and conductive coating.

The utilization process of lithium-ion battery packs, including the cycle of charging and discharging, the size of charging and discharging current, the selection of charging and discharging cut-off voltage, and the charging and discharging methods used for recycling, also have a significant impact on the cycle life of lithium-ion batteries. Blindly increasing the battery current, adding charging cut-off voltage, and lowering the discharge cut-off voltage can reduce the capacity of lithium-ion battery packaging in cities.

The difference in charge and discharge cut-off voltage of lithium-ion batteries in differential electrochemical systems. During the charging process of lithium-ion batteries, any voltage above the charging cut-off voltage is considered overcharging. When a lithium-ion battery is overcharged, excess lithium ions released from the positive electrode will deposit or embed into the negative electrode, and the deposited active lithium is prone to echo with the solvent, releasing heat and causing the battery temperature to rise. When the discharge voltage of a lithium-ion battery is lower than the discharge cut-off voltage, it forms over discharge.

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