The latest publication of the journal "Science" publishes a major breakthrough in the field of electrolyte chemistry research: U.S. scientists use liquefied gas instead of electrolyte for the first time, allowing lithium batteries and supercapacitors to operate efficiently at -60°C and minus 80°C, respectively. . The new technology not only improves the operating mileage of single-charging electric vehicles in the cold winter, but also provides power for drones, satellites, and interplanetary detectors in high altitude and cold environments. The scientific community generally believes that electrolytes are the biggest bottleneck for improving the performance of energy storage devices. Liquid electrolytes have encountered the limits of research, and many scientists now focus on solid electrolytes. But Professor Meng Ying, the director of the Sustainable Power and Energy Center and the Energy Storage and Conversion Laboratory at the University of California, The Yaga Division, led the team to conduct research on gaseous electrolytes and make breakthroughs. These gaseous electrolytes can be liquefied at a certain pressure and are more resistant to freezing. In the new study, they selected two liquefied gases from a large number of gas candidates - fluoromethane and difluoromethane, which were made into electrolytes for lithium batteries and supercapacitors, respectively, so that the minimum operating temperature of lithium batteries extended from minus 20°C. At minus 60°C, the supercapacitor's operating temperature extends from minus 40°C to minus 80°C. Moreover, after returning to normal room temperature, these electrolytes can still maintain efficient operation. In addition to creating a record of cryogenic work, these gaseous electrolytes also overcome the common thermal runaway problems in lithium batteries, providing additional safety advantages. Thermal runaway is a vicious circle of heat in the battery. When the battery is working, the temperature rises, and a series of chemical reactions are initiated. The heat generated by these reactions in turn causes the battery to become hot and the battery expands and is destroyed. However, when the gaseous electrolyte is at a temperature higher than room temperature, it will initiate a natural shutdown mechanism to stop the battery from losing its conductivity and prevent the battery from overheating. The latest research also overcomes another major challenge of lithium battery charge and discharge life is too short. Lithium metal is considered as the ultimate electrode material due to its light weight and ability to store more charge, but lithium reacts with the conventional electrolyte, forming pinpoint protrusions on the surface of the electrode, separating the cells and causing a short circuit, resulting in too few charge and discharge times. . The new electrolyte will not form protrusions, greatly extending battery life. The researchers said that they will next implement the goal of operating lithium batteries at lower temperatures (minus 100°C) and provide new energy-supply techniques for Mars exploration and even deep-space exploration devices such as Jupiter and Saturn. (Reporter Nie Cuirong) PVC floor mats are a common and popular choice for home and office flooring. They offer many benefits, including durability, convenience, and stylish appeal. Pvc Floor Mat,Flooring Pvc Mat,Pvc Floor Mat For Room,Pvc Floor Mats For Home Jiangyin Yining E-Commerce Co., Ltd , https://www.nbpvcmatyining.com
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Liquefied gas allows lithium batteries to operate efficiently at minus 60°C