Why does lithium-ion battery charge more temperature than discharge?

Why lithium-ion batteries charge at a higher temperature than discharge. Many companies' battery products can be discharged normally at low temperatures, but at the same temperature, the battery is difficult to charge normally, or even impossible to charge. When lithium ions are intercalated into graphite materials, the first step is to remove solvation, which consumes some energy and prevents lithium ions from diffusing into the graphite. When Li+ exfoliates the graphite material into the solution, there is a solvation process, and the solvation process does not consume energy, so Li+ can quickly exfoliate the graphite. Therefore, the charge acceptability of graphite materials is significantly lower than the discharge acceptability. Lithium-ion batteries have certain risks in charging lithium-ion batteries in low-temperature environments. As the temperature decreases, the dynamic characteristics of the graphite anode become worse. During the charging process, the electrochemical polarization of the cathode is obviously intensified, and the precipitated metallic lithium is easy to form lithium dendrites, which breaks through the film and causes a short circuit between the anode and the cathode. Try to prevent charging Li-ion batteries at low temperatures. When the low-temperature battery must be charged, it is necessary to choose a low-current charging (such as slow charge) lithium-ion battery as much as possible and fully use the lithium-ion battery after charging, to ensure that the metal lithium precipitates react with the graphite negative electrode and re-insert it into the graphite negative electrode. Companies and scientific research institutions in the industry are exploring and solving the problem of low-temperature resistance of batteries, focusing on improving the existing positive and negative material technologies, and creating conditions for low-temperature operation of batteries by increasing the local environmental temperature of the battery. With the further development of this technology, lithium-ion batteries will have further breakthroughs in low-temperature environments. 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: Lithium-ion batteries usher in new development opportunities