What are the consequences of using lithium iron phosphate batteries at low temperatures?

The use of lithium iron phosphate batteries is restricted in low temperature environments. In addition to the severe deterioration of discharge capacity, lithium batteries cannot be charged at low temperatures. During low-temperature charging, the intercalation of lithium ions on the graphite electrode of the battery and the lithium plating reaction coexist and compete with each other. Under low temperature conditions, the diffusion of lithium ions in the graphite is inhibited, and the conductivity of the electrolyte decreases, which leads to a decrease in the intercalation rate and makes the lithium plating reaction more likely to occur on the graphite surface. At low temperatures, the activity of the positive electrode material decreases, so that the number of lithium ions that can move and bring about the discharge current decreases, which is the fundamental reason for the decrease in capacity. At low temperatures, the diffusion and movement ability of charged ions in the positive and negative materials becomes poor, and it becomes difficult to pass through the passivation film of the electrode and the electrolyte, and the speed of transmission in the electrolyte is also reduced, and additional occurrences will occur during the transfer process. A lot of calories. After lithium ions reach the negative electrode, the diffusion inside the negative electrode material also becomes unsmooth. Throughout the process, the movement of the charged ions has become difficult. From the outside, it is the internal resistance of the battery that has increased. Low temperature performance limits the use of lithium iron phosphate batteries in the field of electric vehicles, military industries and extreme environments. The development of lithium batteries with excellent low temperature performance is an urgent need for the market. 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: Analysis of lithium battery maintenance