Analysis on the method to solve the flammability problem of lithium battery

The method to solve the flammability problem of lithium batteriesBecause of poor thermal stability and no good electrical control system, lithium batteries have huge electric potential and safety hazards. On the road, in addition to electric vehicles, consumer electronic products use the same lithium batteries and are flammable. , Although it has been delivered before safety testing, but as in the news, such as cell phone battery blasting is often reported. Recently, researchers from the University of North Carolina at Chapel Hill (UNC Chapel Hill), in an experiment called Perfluoropolyether (Perfluoropolyether), found that the material can be mixed with lithium salt solution, which means that the battery's conductive properties are completed. Staff Dominica Wong clarified: Most polymers dissolve salt, but this material can. Most importantly, it is not flammable. Perfluoropolyether, abbreviated as PFPE, is a liquid-like polymer at room temperature and has been used as a lubricant for aerospace machinery parts for decades. Has good thermal stability and oxidation stability. But the batteries of mobile phones, laptops, and electric vehicles also need electrolytes, and electrolytes are usually made of ion-rich polydiethyl acetate (DMC). Josephine de Simon, who led the research team, said that due to the presence of DMC, lithium batteries are unstable and are flammable even at room temperature. So when an electric car is hit, even if there is no fire in the battery, the battery can easily catch fire, turning the car into a reactor. Therefore, if PFPE can replace DMC as the electrolyte, theoretically, the stability of the battery can be greatly improved. In fact, De Simon's team did it. They melted PFPE and DMC as the electrolyte of a lithium battery and found that not only the thermal stability of the battery has been greatly improved, but also the conductive power has also been greatly improved. De Simon also emphasized the use of lithium-air batteries. One of the shortcomings of lithium-air batteries, the highest energy density of lithium batteries, the electrolyte is incompatible with oxygen, and PFPE may be able to help deal with, so that lithium-air batteries, with the same energy density as gasoline, is one step closer to practicality. So how does the PFPE electrolyte battery perform in terms of thermal stability? The test conducted by the researchers showed that the battery can withstand a temperature range of -90°C to 200°C. It is too tight for the power lithium-ion battery of electric vehicles, and the typical Lithium batteries can withstand a temperature range of -20℃-60℃. If the temperature is too low or too high, its conductivity will be greatly reduced. Although PFPE batteries are still a long way from commercial use, it at least proves one thing: the thermal stability and conductivity of electric vehicle batteries can be completely dealt with. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Will the lithium battery be replaced?