As we all know, lithium batteries cannot be charged in low temperature environments. Why can’t the lithium-ion battery be charged in a low temperature environment? Today we will give you a detailed answer.
Lithium-ion batteries cannot be left at too low a temperature. At too low temperatures, lithium deposits in the battery cause internal short circuits. Simply put, in a low temperature environment, it is not that the lithium battery is really dead, but that it has electricity but cannot be released normally. At zero degrees Celsius, the capacity of ordinary lithium batteries will be reduced by 20%, and when it reaches minus 10 degrees Celsius, the capacity may be only about half.
In a low temperature environment, the viscosity of the electrolyte increases and even partially solidifies, resulting in a decrease in the conductivity of lithium-ion batteries.
The compatibility between the electrolyte and the negative electrode and the separator becomes poor in a low temperature environment.
Lithium precipitation is serious in the negative electrode of lithium-ion battery under low temperature environment, and the precipitated metal lithium reacts with the electrolyte, and its product deposition leads to an increase in the thickness of the solid-electrolyte interface (SEI).
In the low temperature environment, the diffusion system of the lithium-ion battery in the active material decreases, and the charge transfer resistance (Rct) increases significantly.
According to effective statistics, when the lithium battery is discharged at minus 20 ℃, only about 30% of the nominal capacity. Some traditional low-temperature lithium batteries can be discharged normally between -20~+55℃. However, in the fields of aerospace, polar scientific research, and special equipment, lithium batteries are required to work normally at -40°C. Therefore, the emergence of low-temperature lithium batteries is of great significance.
Post time: Jul-07-2022