Compared with the existing lithium-ion batteries, lithium-sulfur batteries using elemental sulfur as the positive electrode and lithium metal as the negative electrode have higher energy density, lower raw material cost and better environmental affinity. However, limited to the cycle life is too short, lithium-sulfur batteries can not yet be practical applications in the field of large-scale energy storage and electric vehicles. Recently, "Proceedings of the National Academy of Sciences," published an online article said that scientists will be an ultra-thin ultra-thin surface composite membrane brush coated to the surface of the sulfur electrode, so that the life of lithium-sulfur batteries significantly improved. The first author of the paper, Liu Wen, a professor at the Faculty of Science at Beijing University of Chemical Technology, said in an interview with reporters: In theory, lithium-sulfur batteries can achieve three times the storage density of existing lithium-ion batteries and ease the mileage anxiety of electric vehicles. However, the charge and discharge intermediates of the sulfur electrode dissolve into the electrolyte solution, causing the loss of sulfur and side reactions, resulting in failure of the lithium-sulfur electrode after several weeks of use. Since the advent of lithium-sulfur batteries in the 60s of last century, scientists have been devoted to improving the stability of the sulfur electrodes. Liu Wen and Wang Hailiang, an assistant professor of chemistry at Yale University, developed a simple and easy method of simply mixing a dendrimer containing a specific functional group (amide) with graphene and then coating the surface of a sulfur electrode to form a composite film. Through the surface of the composite membrane protection, lithium-sulfur battery to achieve more than 1000 stable cycles. Through this technology, is expected to create a lighter weight, better performance, cheaper car batteries and improve the battery life of electric vehicles. In addition, the research team also investigated the interaction between the composite membrane and the charge-discharge intermediate of the battery through experiments and theoretical calculations, and determined the chemical sulfur-fixing mechanism in the lithium-sulfur battery. Compared with the previous studies, the composite membrane can effectively improve the cycle performance of the lithium-sulfur battery with almost no additional volume or weight, so that the lithium-sulfur battery is one step closer to practical use. Welding Mill,Welded Tube Line,Octagonal Tube Machine,Roll Shutter Tube Machine WUXI LONGBO ROLL FORMING MACHINERY CO.,LTD , https://www.lbrollformer.com