The actual life of a lithium battery is less than the theoretical life

In general, the life of a lithium-ion battery is determined at the moment the battery is finished. This is determined by the specific characteristics of the material and structure. The battery life calculated based on the material and structure is called theory. Life expectancy, but the lithium battery at work often shows actual life and does not meet the theoretical life expectancy. The extent to which the actual lifetime does not reach the theoretical lifetime is due to the non-working loss of capacity.

This non-working loss is affected by the following factors:

1. The side reaction of lithium ion battery,

2. Irreversible consumption of active substances in lithium ion batteries,

3. For large-scale lithium-ion batteries, the battery has a large operating current and slow heat dissipation, which easily causes damage to the battery structure.

4. If the lithium battery is added with safety protection measures, it needs to be maintained by the power provided by the lithium battery.

The loss of lithium battery capacity is manifested during the charging, discharging and self-discharging of lithium batteries:

1. As the number of cycles increases, the charging time decreases. The charging platform of the lithium battery is 3.7V~4.2V. At this stage, the charging capacity accounts for more than 90% of the total charging capacity. As the number of cycles increases, the voltage rising speed increases and the charging capacity decreases.

2. The discharge platform of the lithium battery is in the range of 4.1V~3.6V. At this stage, the discharge capacity accounts for more than 90% of the total capacity. As the number of cycles increases, the discharge platform of the lithium battery decreases, and the discharge capacity also decreases.

3. The ratio of the self-discharge of the lithium battery to the total power of the lithium battery increases as the number of cycle increases but the lithium battery discharge platform is accelerated.

The reduction in the lifespan of lithium-ion batteries is characterized by capacity decline. The life of lithium batteries is limited. This is the same as the development of anything. Capacity decline is a manifestation of quantitative change to qualitative change. It can be seen from this performance that the method of extending the life of a lithium battery is undoubtedly considered from the viewpoint of scientific charge and discharge and reduction of self-discharge.

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