Basic knowledge of lithium iron phosphate voltage range

ALBANY, Calif. - April 11, 2022 - PRLog -- Generally, the upper limit voltage of lithium iron phosphate battery charging is 3.7~4V, and the lower limit voltage of discharging is 2~2.5V. Considering the five aspects of discharge capacity, discharge median voltage, charging time, constant current capacity percentage, and safety, constant current and constant voltage are adopted. For the lithium iron phosphate battery, it is reasonable to set the charging limit voltage at 3.55~3.70V, the recommended value is 3.60~3.65V, and the discharge lower limit voltage is 2.2V~2.5V.

The lithium iron phosphate battery has a designed 3.6v charging limit, so that the design can fully activate the battery capacity to the maximum without damaging the battery.

The number of charging refers to the number of complete charge and discharge cycles. Although the design of 3.4V is not overcharged, there will be a small number of people who do not participate in the cycle charge and discharge. Poor, vicious circle until it can't be used. This is the limitation of its life, the superposition of various unavoidable harmful and unfavorable factors, and it is inevitable that the performance cannot maintain the original design parameters.

The production process of lithium iron phosphate battery is basically the same as that of other lithium battery types. Its core processes are: batching, coating, rolling, filming, and winding. In the batching process, the conductivity of lithium iron phosphate materials is relatively poor, so the particles are generally made smaller. The objective effect of this is that the internal arrangement is more uniform, which promotes the formation of a balanced voltage platform, which can be maintained during operation. The state of the battery is stable

Charging and discharging are two basic working states of lithium batteries. When the lithium iron phosphate battery is charged and discharged, due to the weak oxidation ability of iron ions, it will not release oxygen, and it is naturally difficult to have a redox reaction with the electrolyte, which makes the charging and discharging process of the lithium iron phosphate battery in a safe environment. Not only that, it is difficult for lithium iron phosphate batteries to undergo severe redox reactions during high-rate discharge or even overcharge and discharge. At the same time, after the lithium is deintercalated, the lattice change will reduce the final volume of the unit cell (the smallest constituent unit of the crystal), which just offsets the increased volume of the carbon negative electrode during the reaction. Therefore, during charging and discharging, the lithium iron phosphate battery The stability of the physical structure can be maintained, and the hidden danger of the battery bursting phenomenon caused by the increase in volume is eliminated.
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