What are the important effects of lithium batteries in low temperature environments?

The impact of low temperature on lithium titanate batteries is also lithium batteries, and the low temperature resistance of lithium titanate batteries is relatively excellent. The lithium titanate anode material with spinel structure has a lithium insertion potential of about 1.5V, does not form lithium dendrites, and the volumetric strain is less than 1% during charge and discharge. The nanometerized lithium titanate battery can be charged and discharged with high current, which realizes low-temperature fast charging while ensuring the durability and safety of the battery. For example, Yinlong New Energy, which focuses on lithium titanate batteries, has its products with normal charge and discharge capabilities at -50-60°C. Lithium titanate battery has material advantages. It can still achieve fast charging at low temperatures. This kind of willfulness is difficult to learn from batteries of other materials. Why does charging require more temperature than discharging? Many companies’ battery products can achieve normal discharge at low temperatures, but at the same temperature, it is more difficult to achieve normal charging, or even unable to charge. When Li+ is embedded in the graphite material, it must first be desolvated. This process consumes a certain amount of energy. It hinders the diffusion of Li+ into the graphite; on the contrary, when Li+ is released from the graphite material into the solution, there will be a solvation process, and solvation does not consume energy, and Li+ can quickly release the graphite. Therefore, the charge acceptance capability of graphite materials is obviously inferior to the discharge acceptance capability. In a low temperature environment, battery charging has certain risks. Because as the temperature decreases, the kinetic characteristics of the graphite negative electrode become worse. During the charging process, the electrochemical polarization of the negative electrode is obviously intensified, and the precipitated metal lithium is likely to form lithium dendrites, piercing the diaphragm and causing the short circuit of the positive and negative electrodes. . Try to prevent lithium batteries from charging at low temperatures. When the battery must be charged at low temperature, the lithium battery should be charged with a small current (ie slow charge) as much as possible, and the lithium battery should be fully put on hold after charging, so as to ensure that the metal lithium precipitated from the negative electrode can react with the graphite. Embedded in the graphite anode. 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: Do you know what are the important characteristics of Ni-MH batteries?