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, in a low-temperature environment, 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 shown in the following aspects:
The main results are as follows: 1. The internal resistance increases: low temperature will lead to the decrease of the ion conduction capacity of the electrolyte and the reaction ability of the active material of the electrode material, thus increasing the internal resistance of the battery.
2. Capacity reduction: at low temperature, the available capacity of the battery will decrease, which is because the reaction rate of the active material of the electrode material slows down, which reduces the discharge capacity of the battery.
3. Life is shortened: at low temperature, the cycle life of the battery will be affected. This is because at low temperature, the active material of the electrode material is easy to form a solid electrolyte interface layer during the charge-discharge cycle, which reduces the reaction activity of the electrode material, thus shortening the cycle life of the battery.
In order to reduce the attenuation of lithium iron phosphate battery at low temperature, the following methods can be taken:
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 ion conduction performance of the electrolyte at low temperatures can be improved, thus the internal resistance of the battery can be reduced.
3. The heating system is used to maintain the battery temperature and improve the performance of the battery at low temperatures, which is one of the widely used methods in electric vehicles and other fields.
4. When designing the battery system, the use environment at low temperatures should be considered, the battery combination mode should be reasonably selected and the working conditions of battery charging and discharge should be controlled.
5. R & D, production and manufacture of low-temperature lithium iron phosphate batteries specially suitable for working in low-temperature environments.
