What is the fundamental reason for the decay of the cycle life of lithium-ion batteries?

Batteries are used, feel not durable, capacity is not more than before, these are the continuous decay of the cycle life. Next, we will talk about the long-term reliable use of lithium-ion batteries: cyclic life.

The decay of the cycle life is actually a changing trend of the actual available capacity of the battery, relative to its rated capacity at the time of delivery.

For an ideal lithium-ion battery, the capacity balance within its cycle does not change, and the initial capacity in each cycle should be a certain value, but in fact the situation is much more complicated. Any side reaction that can produce or consume lithium ions may lead to a change in the battery capacity balance. Once the battery's capacity balance state changes, this change is irreversible and can be accumulated through multiple cycles, which can have serious effects on the battery cycle performance..

There are many factors that affect the cycle life of lithium ion batteries, but the underlying reason is that the number of lithium ions involved in energy transfer is constantly decreasing. It should be noted that the total number of lithium elements in the battery has not decreased, but there are fewer "activated" lithium ions. They are trapped in other places or the channels of activity are blocked and can not freely participate in the process of circular charging and discharging.

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