Lithium battery is most afraid of low temperature?

As the weather gets colder, the original full-energy lithium battery has to reduce its capacity. Lithium batteries seem to have entered a hibernation state, which has brought a lot of trouble to users of new energy vehicles and digital products. The topic that this article focuses on today is the impact of low temperature on lithium batteries and the development of the industry. Lithium batteries are most afraid of low temperatures? In a test conducted by the American Automobile Association, an electric car has a mileage of 105 miles at 75 degrees Fahrenheit and 43 miles at 20 degrees Fahrenheit, a drop of up to 60%. . The similarity between batteries and human beings is that when the climate gets colder, the battery's activity decreases, and lead batteries, lithium batteries and fuel power batteries are all affected by low temperatures to varying degrees. Take the lithium iron phosphate battery as an example, which is the most used on electric buses. The battery has high safety and long cell life, but its low temperature performance is slightly worse than other technical systems. Low temperature has a certain effect on the positive and negative electrolytes and binders of lithium iron phosphate. For example, the lithium iron phosphate cathode has poor conductivity and is easily polarized at low temperatures, which reduces the battery capacity. Under the influence of low temperature, the embedding speed of lithium in graphite is reduced, and the appearance of the negative electrode makes it simple to separate lithium from metal. If the use time after charging is not enough to be put into use, lithium cannot be re-embedded in graphite. Under low temperature conditions, the viscosity of the electrolyte will increase, and the removal resistance of lithium ions will also increase. In addition, in the processing of lithium iron phosphate, the adhesive is also a very critical element, and low temperature will have a greater impact on the function of the adhesive. The same lithium battery, lithium titanate battery has better low temperature resistance. The spinel structure lithium titanate cathode data is embedded with a lithium potential of about 1.5V, and no lithium dendrites are formed, and the volumetric strain during charging and discharging is less than 1%. 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. Although the graphite negative lithium battery can be charged at a temperature of -40c, it is more difficult to perform conventional current charging at a temperature of -20c or lower. This is an area that the industry is actively exploring. Low-temperature lithium battery industrial research industry companies and scientific research institutions explore and solve the problem of low-temperature resistance function of the battery, focusing on the improvement of technology, the existing anode and cathode data, and the increase of the local environmental temperature. The battery creates conditions for working at low temperatures. . At present, battery data are all nanometers, and the size, resistance, and length of the AB surface axis of the data will all affect the low temperature characteristics of the battery. Abstract Using lithium iron phosphate as raw material, lithium iron phosphate materials were prepared through three different processes, and the nano-level and coating layers were selected through different processes, and satisfactory results were obtained. The addition of the length of the AB face shaft makes the lithium ion removal channel larger, which is conducive to the improvement of the battery multiplier function. From the data obtained from the three processes, the bulk resistance and ion migration resistance of graphite with large interlayer spacing are relatively small. In terms of electrolyte, Wotma uses low-temperature additives to increase the discharge capacity from 85% to 90% on the basis of a fixed solvent system and lithium salt. It is known that as early as the end of 2016, under the environment of -20℃, -30℃ and -40℃, the 0.5c constant current ratio is 62.9% for charging and 94% for discharging. At present, Waterma's low-temperature batteries have been widely used in Inner Mongolia and the three northeastern provinces. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete it. Previous post: Is the safety problem of lithium batteries really unsolvable?