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What are the life cycle times of lithium batteries? Lithium battery cycle count: This value represents the total number of complete and partial discharge cycles throughout the entire battery life. The decay of cycle life is actually a trend of continuous decline in the actual available capacity of lithium batteries compared to their rated capacity at the time of production. For an ideal lithium-ion battery, the capacity balance will not change during its cycle, and the initial capacity in each cycle should be a certain value.

How many times is the life cycle of a lithium battery? With the promotion of energy conservation and environmental protection in society, more and more environmentally friendly products are being applied to the market. In the battery industry, lithium batteries quickly occupy the market with numerous advantages and gradually replace traditional lead-acid batteries. For traditional batteries, lithium batteries have advantages such as long lifespan, energy conservation, environmental protection, and pollution-free, low maintenance costs, complete charging and discharging, and light weight. Overall, lithium batteries have a long lifespan, to what extent? Let me talk about it.

What are the life cycle times of lithium batteries?

The number of life cycles of lithium batteries is determined based on battery quality and battery materials:

1. The cycle times of ternary lithium batteries are about 800 times.

2. The lithium iron phosphate battery has approximately 2500 cycles.

3. There is a difference in the number of cycles between genuine and defective batteries. Authentic batteries are designed and produced according to the cycle times specified in the battery manufacturer's specifications, while defective batteries may sometimes have less than 50 cycles.

The current 3.7V 18650 has a typical cycle life of around 500-1000 cycles, while the 3.2V 18650 has a typical life of over 2000 cycles. Of course, the prerequisite is that qualified batteries produced by reputable manufacturers have a short lifespan if they are defective or counterfeit. The so-called lifespan of a lithium battery refers to the capacity decay of the battery to 70% of its nominal capacity after a period of use, which can be considered as the end of its lifespan.

The cycle life of lithium batteries is generally calculated based on the number of cycles they are fully charged and discharged in the industry. During use, irreversible electrochemical reactions occur inside lithium batteries, leading to a decrease in capacity, such as electrolyte decomposition, deactivation of active materials, collapse of positive and negative electrode structures, resulting in a decrease in the number of lithium ion insertion and deintercalation, and so on. Experiments have shown that higher rate discharge leads to faster capacity decay. If the discharge current is lower, the battery voltage will approach the equilibrium voltage, which can release more energy.

The theoretical lifespan of ternary lithium batteries is about 800 cycles, which is considered moderate in commercial rechargeable lithium batteries. Lithium iron phosphate batteries have about 2000 cycles, while lithium titanate is said to be able to achieve 10000 cycles. At present, mainstream lithium battery manufacturers promise to produce ternary battery cells more than 500 times in their specifications. However, after the lithium battery cells are assembled into lithium battery packs, due to consistency issues, the main reason is that the voltage and internal resistance cannot be exactly the same, and their cycle life is about 400 times.

Generally speaking, the number of cycles for ternary lithium batteries is around 500-1000. If it is assumed that new energy vehicles can run 300km in a complete cycle, it means that the battery will only run out of cycles after 150000 to 300000 kilometers.

There are many factors that affect the cycle life of lithium batteries, but the fundamental reason behind them is the continuous decrease in the number of lithium ions involved in energy transfer. It should be noted that the total amount of lithium elements in the battery has not decreased, but rather there are fewer "activated" lithium ions, which are trapped in other places or their active channels are blocked, and cannot freely participate in the process of cyclic charging and discharging. So, as long as we understand where these lithium ions that should have participated in the oxidation-reduction reaction have gone, we can understand the mechanism of capacity decline and take targeted measures to delay the capacity decline trend of lithium batteries and improve their cycle life.

Summary: The number of cycles and charging cycle of lithium batteries are closely related. The number of cycles for lithium batteries refers to the complete charging and discharging process of a mobile phone battery, which means that the number of cycles is+1. However, what we commonly refer to as the charging cycle is mostly understood as+1 for each time the phone is plugged in and unplugged for charging. There is a significant difference in definition between the two, as the number of battery cycles does not necessarily represent the number of charges.

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