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1) Capacity

The capacity change of lithium-ion batteries that have been shelved for a long time is mainly reflected in two aspects: firstly, the decrease in battery capacity, which is mainly caused by self discharge; The second is the addition of irreversible capacity, which mainly depends on the irreversible consumption reactions between the internal chemical systems of the battery. The phenomenon of self discharge is unavoidable in all lithium-ion batteries. The capacity loss caused by self discharge can be divided into two categories: reversible and irreversible: reversible refers to the portion of capacity that can be recovered when charging a lithium-ion battery, and irreversible loss refers to the unrecoverable capacity. It is necessary for battery manufacturers and battery users to reduce battery capacity loss after long-term storage.

2) Internal resistance

The internal resistance of a battery refers to the resistance between the positive and negative ends, which is the sum of the resistances of the current collector, electrode active material, separator, electrolyte, conductive handle, and terminal. For lithium-ion batteries, the smaller the internal resistance, the smaller the voltage occupied during battery discharge, and the more energy they can output. But for batteries with long-term storage, the resistance often increases with the addition of storage time. Exceeding a certain resistance can cause the battery to exceed the benchmark internally, leading to scrapping or degradation. Therefore, it is necessary to pay attention to the changes in resistance during long-term storage of the battery.

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