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There are many factors that affect the capacity of lithium-ion batteries, such as the use temperature, charge and discharge current, charge and discharge cut-off voltage, and other factors will affect the decay rate of lithium-ion batteries. The mechanism causing the capacity decline of lithium ion batteries can be divided into three categories: the increase of internal resistance and polarization, the loss of positive and negative active substances, and the loss of Li.

Different external factors have different effects on the three. For example, LiFePO4 lithium-ion batteries have very good cycle performance, but different service conditions have an important impact on the cycle life of lithium-ion batteries.

The test shows that the two discharge systems have completely different effects on the 26650 lithium-ion battery by 15C pulse discharge and 15C continuous discharge. The capacity of 26650 lithium-ion battery with 15C pulse discharge declines very fast. It can't discharge at 15C after 40 times of charging and discharging, but it can still discharge at 1C. However, the capacity decline of 15C continuous discharge battery is slow, and it can still discharge at 15C after 60 times, but the decline rate of 1C rate is faster than that of 15C pulse discharge.

Lithium-ion battery processing customization

The research on the influence of lithium ion battery life decline can better guide our design of lithium ion battery. The following are the effects of different charging control strategies on the life decline of lithium-ion batteries, their use mechanism is studied, and the life decline model of lithium-ion batteries is proposed.

The mechanism analysis concluded that more LiF appeared in the SEI film of the negative electrode of the battery with 15C pulse discharge, and LiF had greater hindrance to the diffusion of lithium ion, which made the Li+diffusion impedance and charge exchange impedance of the battery increase rapidly, which caused the polarization voltage of the battery to be too large during the charging and discharging process, resulting in the rapid decline of the large current discharge capacity of LiFePO4.

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