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18650 rechargeable battery lithium 3.7v 3500mah
18650 rechargeable battery lithium 3.7v 3500mah

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20kwh energy storage battery.What are the important reasons for the capacity degradation of lithium batteries

source:Industry News release time:2023-11-10 Hits:     Popular:AG11 battery

  18650 battery pack

  Reason 1: Self discharge

  Self discharge of lithium-ion batteries refers to the phenomenon of natural loss of capacitance when the battery is not in use. There are two types of capacity loss caused by self discharge of lithium-ion batteries: one is reversible capacity loss; The second is the loss of irreversible capacity. Reversible capacity loss refers to the capacity that can be recovered during charging, while irreversible capacity loss cannot be recovered. When self discharging for a long time or frequently, lithium ions will form a certain amount of deposition, increasing the degree of capacity imbalance between the two poles, leading to the loss of capacity in lithium-ion batteries.

  Reason 2: Decomposition of electrolyte

  In the normal operation of lithium-ion batteries, the electrolyte undergoes an oxidation reaction, which increases the concentration of the electrolyte and leads to a decrease in electrolyte stability, ultimately leading to a decrease in the capacity of the lithium-ion battery.

  Reason three: overcharging

  When overcharging a lithium-ion battery, it can lead to a decrease in discharge efficiency and capacity loss. Fast charging, excessive current density, severe polarization of the negative electrode, and more pronounced deposition of lithium ions. In situations where there is an excess of positive electrode active material relative to negative electrode active material, this reaction often intensifies. However, under high charging rates, even if the proportion of positive and negative active substances is normal, the deposition of metallic lithium may occur.


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