Reason for low temperature attenuation of lithium iron phosphate battery

Lithium iron phosphate battery is a common type of lithium ion battery, which has the advantages of high energy density, long cycle life and no pollution, so it is widely used in electric vehicles, power tools and other fields. However, at low temperature, the performance of lithium iron phosphate battery will be degraded to a certain extent.

The attenuation of lithium iron phosphate battery at low temperature is mainly manifested in the following aspects:

1, the increase of internal resistance: low temperature will lead to the decrease of the ionic conductivity of the electrolyte, the reaction ability of the active material of the electrode material is reduced, so that the internal resistance of the battery is increased.

2, capacity reduction: at low temperature, the available capacity of the battery will be reduced, this is because the reaction rate of the active material of the electrode material is slowed down, so that the discharge capacity of the battery is reduced.

3. Shortened life: at low temperature, the cycle life of the battery will be affected. This is because at low temperature, the active substance of the electrode material is easy to form a solid electrolyte interface layer during the charge-discharge cycle, which leads to the decrease of the reactivity of the electrode material, thus shortening the cycle life of the battery.

In order to reduce the attenuation of lithium iron phosphate batteries at low temperatures, the following methods can be adopted:

1, the use of optimized electrode materials, such as high specific energy electrode materials, can improve the capacity and performance of the battery at low temperature.

2. By changing the electrolyte composition and adding additives, the ionic conductivity of the electrolyte at low temperature can be improved, thus reducing the internal resistance of the battery.

3. The heating system is used to maintain the temperature of the battery and improve the performance of the battery at low temperature, which is one of the methods widely used in electric vehicles and other fields.

4, in the design of the battery system, should take into account the use of low temperature environment, and reasonable choice of battery combination and control of battery charging and discharging conditions.

5. R&d, production and manufacture of low-temperature lithium iron phosphate batteries specially suitable for working in low-temperature environment.

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