Sulfur cathodes are so reactive that they dissolve during battery operation. Both the cathode and anode are super reactive. But there are problems with lithium-sulfur batteries.
Also, sulfur is more abundant and less problematic to source than the cobalt used in traditional lithium-ion battery cathodes. They can store up to two times more energy per kilogram than today's lithium-ion batteries-this could double the range of electric vehicles without any increase in the weight of the battery pack. Lithium-sulfur batteries are an essential part of next-generation battery technologies because they promise higher energy densities and lower costs. What's also special about this electrolyte is that it is compatible with a lithium-sulfur battery, which is a type of rechargeable battery that has an anode made of lithium metal and a cathode made of sulfur. Plus, dibutyl ether can easily take the heat because it stays liquid at high temperatures (it has a boiling point of 141 C, or 286 F). This weak molecular interaction, the researchers had discovered in a previous study, improves battery performance at sub-zero temperatures. In other words, the electrolyte molecules can easily let go of lithium ions as the battery runs. A special feature about dibutyl ether is that its molecules bind weakly to lithium ions. It is made of a liquid solution of dibutyl ether mixed with a lithium salt. The batteries that Chen and colleagues developed are both cold and heat tolerant thanks to their electrolyte. They also had high Coulombic efficiencies of 98.2% and 98.7% at these temperatures, respectively, which means the batteries can undergo more charge and discharge cycles before they stop working. If the batteries cannot tolerate this warmup at high temperature, their performance will quickly degrade." In tests, the proof-of-concept batteries retained 87.5% and 115.9% of their energy capacity at -40 and 50 C (-40 and 122 F), respectively. "Also, batteries warm up just from having a current run through during operation. In electric vehicles, the battery packs are typically under the floor, close to these hot roads," explained Chen, who is also a faculty member of the UC San Diego Sustainable Power and Energy Center. "You need high temperature operation in areas where the ambient temperature can reach the triple digits and the roads get even hotter. Such batteries could allow electric vehicles in cold climates to travel farther on a single charge they could also reduce the need for cooling systems to keep the vehicles' battery packs from overheating in hot climates, said Zheng Chen, a professor of nanoengineering at the UC San Diego Jacobs School of Engineering and senior author of the study. The findings of the study were published in the journal Proceedings of the National Academy of Sciences. The researchers also found out that an electrolyte not only is versatile and robust throughout an extensive temperature range but also compatible with a high- energy anode and cathode. * Updated п'ятниця 15 Липень 2022 p.Washington, July 5 (ANI): According to a new study, engineers from the University of California San Diego have discovered that lithium-ion batteries perform well in extreme weather conditions while packing a lot of energy.
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