What is the cause of battery capacity decay

Batteries are widely used in our daily life, such as two-wheeled electric vehicles, electric vehicles, electric buses, mobile phone batteries, etc. all need batteries. Common batteries include lithium batteries and lead-acid batteries. When you use the battery capacity tester to test, you will find that as time goes by, the battery capacity will decay, and it will become less and less durable.

Causes of battery capacity fading

After the battery is used, it is normal for the battery to wear out. The amount of battery loss is directly related to the frequency of battery use. The main problem with current batteries is "capacity fade," according to battery scientists and engineers. This is a consequence of the second law of thermodynamics.

This is a consequence of the second law of thermodynamics, which states that whenever there is some real process taking place, it wastes a certain amount of electrical energy in that process and cannot recover it.

The capacity balance does not change during its cycle, and the initial capacity in each cycle is a certain value, but the actual situation is much more complicated. Any side reaction that can generate or consume lithium ions or electrons may lead to changes in the battery capacity balance. Once the battery capacity balance state changes, this change is irreversible and can be accumulated through multiple cycles, which will have a negative impact on battery performance. Serious impact. In lithium-ion batteries, in addition to the redox reactions that occur when lithium ions are deintercalated, there are also a large number of side reactions, such as electrolyte decomposition, active material dissolution, and metal lithium deposition.

Battery Age:

When a battery enters the "old" stage, scientists will name the phenomenon of its weakened performance as "capacity fading". The phenomenon of "capacity fading" refers to the phenomenon that the battery capacity gradually decreases as the number of times the battery is charged increases. A mobile phone can last for a whole day when it is first used, but it can only last for a few hours after two years. The reason for this phenomenon is capacity decay.

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