U.S. researchers at the Stanford University is an article in the journal Nature Nanotechnology succeeded by a significant development that could be for future mobile generation devices still of great importance: they have managed to design a safe anode of lithium, thanks to their help it is possible should be to build smaller and yet more powerful lithium-ion batteries.
In lithium-ion batteries that are installed in currently available on the market devices such as laptops, smartphones or tablets, consist mainly of silicon or graphite anodes. According to researchers, there were also attempts last with tin. Since lithium itself, however, has a higher energy density than any of the other substances mentioned and is very light, it is in itself the best anode material Represents the problem is that lithium is moss-like linkages and called dendrites, which affect the performance of a battery pack or in the worst case can even lead to a short circuit. In addition, a lithium anode reacts with the electrolyte in the battery, which further reduces the life of the energy store.
To counteract the aforementioned problems, it is the scientists have now succeeded consisting encase the lithium anode with a newly developed honeycomb-like layer of carbon nano hollow spheres. According to additional comments Golem.de of this coating is chemically very stable and can there thus, on the one hand to prevent the reaction of lithium with the electrolyte, and on the other hand withstand the expansion of the lithium during recharging.
An additional, non-negligible side effect of this strong protective layer around the lithium anode is the existing information, moreover, that by the overheating or fire hazard could be reduced for batteries. Since the lithium hardly comes into contact with the electrolyte, is generated in the battery cells less heat.
Photo: NBB What: Nature.com
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