Why does lithium battery charging require more temperature than discharging?

Careful readers will find that many companies’ battery products can be discharged normally at low temperatures, but at the same temperature, normal charging is more difficult, or even impossible to charge. Why? According to industry sources, when Li+ is embedded with graphite data At this time, the first step is to remove solvation, which will consume some energy and prevent Li+ from dispersing into the graphite. In contrast, when the graphite material is removed from the solution, Li+ undergoes a solvation process, and the solvation process does not require energy, so Li+ can quickly remove the graphite. Therefore, the ability of charging to receive graphite data is obviously not as good as discharging. At low temperatures, battery charging has its risks. As the temperature decreases, the dynamic characteristics of the graphite anode become worse. During the charging process, the electrochemical polarization of the cathode is significantly enhanced. The separated lithium metal simply forms lithium dendrites, and the lithium dendrites break through the gap, resulting in a short circuit between the anode and the cathode. Therefore, the industry advocates the prevention of charging lithium batteries at low temperatures. When the battery must be at a lower temperature, a small current (ie slow charge) rechargeable lithium battery should be selected as much as possible and fully used after charging the lithium battery, make sure that the metal lithium negative electrode can be separated from the graphite and embedded graphite negative electrode from the beginning. Of course, lithium titanate batteries have the advantage of low-temperature fast charging, which is unmatched by other batteries. 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 post: Performance analysis of lithium batteries and nickel-cadmium and nickel-metal hydride rechargeable batteries