What are the important factors that cause poor low-temperature performance of lithium batteries

1. At low temperatures, the viscosity of the electrolyte increases, and the conductivity decreases; 2. The electrolyte/electrode interface membrane resistance and charge transfer resistance increase; 3. The migration rate of lithium ions in the active material body decreases. This causes the low temperature The electrode polarization is intensified, and the charge and discharge capacity is reduced. In general, the factors that affect the high temperature and low temperature of the battery can be summarized as: the conductivity of the electrolyte, the interface impedance, the SEI film, etc. These factors are used together to affect the performance of the battery. In addition, during low-temperature charging, especially during low-temperature high-rate charging, lithium metal precipitation and deposition will occur in the negative electrode. The deposited metal lithium is easy to irreversibly react with the electrolyte and consumes a large amount of electrolyte. At the same time, the thickness of the SEI film is further increased, resulting in The impedance of the negative electrode surface film of the battery is further increased, and the polarization of the battery is strengthened again, which will greatly damage the low-temperature performance, cycle life and safety performance of the battery. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the correct ways to use lithium batteries for mobile phones and laptops?