What are the effects of low temperature environment on lithium iron phosphate batteries?

What are the effects of low temperature environment on lithium iron phosphate batteries? The lithium iron phosphate positive electrode itself has relatively poor electronic conductivity, and it is prone to polarization in low temperature environments, thereby reducing battery capacity; affected by low temperature, the speed of graphite lithium insertion is reduced, and metal lithium is likely to precipitate on the surface of the negative electrode. When used, the metal lithium cannot be fully embedded in the graphite again, and part of the metal lithium continues to exist on the surface of the negative electrode, which is very likely to form lithium dendrites, which affects the safety of the battery. In a low temperature environment, the viscosity of the electrolyte will increase, and the lithium ion migration resistance will also increase. In addition, in the processing technology of lithium iron phosphate batteries, the adhesive is also a very critical factor. Performance will also have a greater impact. Another problem caused by the low temperature is reflected to the user end that the charging time is prolonged. When charging at low temperature, the iron phosphate battery is easy to release lithium, so before charging, the battery is generally heated slowly, and the battery temperature is raised to the normal temperature before charging. At a temperature of 0～-20℃, the discharge capacity of the battery is equivalent to 88.05%, 65.52% and 38.88% of the discharge capacity at a temperature of 25℃; the uniform discharge voltage is 3.134, 2.963V and 2.788V in sequence, a uniform discharge voltage at 20℃ It is 0.431V lower than that at 25°C. It can be seen from the above decomposition that as the temperature decreases, the uniform discharge voltage and discharge capacity of the lithium battery are reduced, especially when the temperature is -20°C, the discharge capacity and uniform discharge voltage of the battery drop faster. It can be concluded from the above data that lithium iron phosphate batteries are greatly affected by temperature. In the use environment where the use range and temperature of power lithium-ion batteries are greatly affected, thermal management of the battery (air cooling, liquid cooling, etc.) can be improved The use efficiency of the battery extends the service life of the battery system. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: How to distinguish between fake and inferior batteries?