Analyze the influence of low temperature on lithium iron phosphate batteries

The impact of low temperature on lithium iron phosphate batteries Lithium iron phosphate is currently the most commonly used battery in electric vehicles. It is safe and has a long battery life, but lithium iron phosphate has a fatal flaw. Low temperature has a certain effect on the positive and negative electrolytes and binders of lithium iron phosphate. For example, the cathode of lithium iron phosphate itself has poor conductivity and is easily polarized at low temperatures, thereby reducing battery capacity. Under the influence of low temperature, the lithium insertion rate of graphite decreases, and the lithium metal is simply separated from the outside of the negative electrode. If the charging time is insufficient and put into use, the metal lithium cannot be completely embedded in the graphite again. At low temperatures, the viscosity of the electrolyte increases, and the migration resistance of lithium ions increases. In addition, the binder is also a very critical factor in the processing technology of lithium iron phosphate, and low temperature will also have a greater impact on the function of the binder. The impact of low temperature on lithium titanate batteries is also lithium batteries, and lithium titanate batteries have better low temperature resistance. The spinel structure of lithium titanate cathode data is embedded with a lithium potential of about 1.5V, and no lithium dendrites are formed, and the volumetric strain is less than 1% during charge and discharge. Nano lithium titanate battery can be charged and discharged with high current, and charged quickly at low temperature, which ensures the durability and safety of the battery. Yinlong New Energy, whose main business is lithium titanate batteries, can be charged and discharged normally at -50-60°C. Lithium titanate battery has the advantage of data, it can also complete fast charging at low temperature, this kind of erratic, other data batteries are difficult to learn. Why charge more temperature than discharge? Many companies' battery products can be discharged normally at low temperatures, but at the same temperature, it is more laborious to complete normal charging, or even unable to charge. When Li+ is embedded in graphite data, the first step is to remove solvation, which will consume a certain amount of energy and prevent Li+ from being dispersed in 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 graphite data to accept charging is significantly worse than that of accepting discharge. At low temperatures, battery charging is dangerous. As the temperature decreases, the dynamic characteristics of the graphite anode become worse. During the charging process, the electrochemical polarization of the anode significantly deteriorates. 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. Try to prevent lithium batteries from charging at low temperatures. When the battery is to be charged at a low temperature, the lithium battery can be charged with a low current. Companies and scientific research institutions in the industry are exploring and solving the low-temperature resistance function of the battery, focusing on the process of improving the existing positive and negative electrode data, and forwarding the battery to the local ambient temperature to create conditions for low-temperature battery operation. With the further development of this technology, lithium 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: Working principle and safety analysis of lithium cobalt oxide battery