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How Many Times is the Life Cycle of a Lithium Battery?

Apr. 29, 2020

As an 18650 Battery Factory, share with you. With the promotion of social energy conservation and environmental protection, more and more environmentally friendly products are being applied to the market. In the battery industry, lithium batteries quickly occupied the market with numerous advantages and gradually replaced traditional lead-acid batteries. For traditional batteries, lithium batteries have the advantages of long life, energy saving, environmental protection, no pollution, low maintenance costs, complete charge and discharge, light weight, etc. In general, lithium batteries have a long life, and to what extent do large-capacity lithium batteries grow?

4.2 v 18650 Battery

4.2 v 18650 Battery

In nature, lithium is a light metal with a small atomic mass. Its atomic weight is 6.94g / mol and ρ = 0.53g / cm3. Lithium has a lively chemical nature, and it is easy to lose electrons and be oxidized to Li +, so the standard electrode potential is negative, -3.045V, and the electrochemical equivalent is small, 0.26g / Ah. These characteristics of lithium determine that it is a very Material with high specific energy.

The so-called lithium battery life means that after the battery is used for a period of time, the capacity declines to 70% of the nominal capacity (the battery capacity at room temperature 25 ° C, standard atmospheric pressure, and discharged at 0.2C), which can be regarded as the end of life. In the industry, the cycle life is generally calculated by the number of full-discharge cycles of a lithium battery. In the process of use, an irreversible electrochemical reaction will occur inside the lithium battery, resulting in a decrease in capacity, such as the decomposition of the electrolyte, the deactivation of the active material, and the collapse of the positive and negative electrode structures leading to a reduction in the number of lithium ions inserted and deintercalated, etc . The experiment indicates that a higher rate of discharge will lead to faster capacity decay. If the discharge current is lower, the battery voltage will be close to the equilibrium voltage, which can release more energy. Large-capacity lithium battery.

The number of life cycles of lithium batteries is determined according to battery quality and battery materials:

1. The number of ternary material cycles is about 800 times.

2. The number of cycles of lithium iron phosphate battery is about 2500 times.

3. The cycle times of genuine batteries and defective batteries are different. Genuine batteries are designed and produced according to the cycle times in the battery manufacturer's specifications, and the defective battery cycles may sometimes be less than 50 times.

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