It was a while that a super promising discovery in the world of batteries did not turn out, and this time we can thank Harvard: the team of researchers led by Xin Li & egrave; managed to create solid-state lithium-ion batteries that promise much more decay; slower than we see in current technology: at least 10,000 charging cycles are mentioned. This, according to scientists' calculations, would allow electric cars to last much longer; than the current ones – let's say between 10 and 15 years, a life comparable to the average life of fossil fuel cars – without ever replacing the battery.
In addition, the batteries developed by the researchers, which use a lithium-metal anode coupled to a high-density cathode; energy already commercially available, they are able to withstand high-density current flows: this means that an electric vehicle could be fully charged in 10 to 20 minutes .
A HIGH VOLTAGE '' SANDWICH '' 
As the image above so eloquently illustrates, the layering system designed by the researchers effectively prevents the most problematic problem. important of the lithium-metal batteries thought up so far: the chemical reactions that take place in the battery cause the formation of lithium dendrites, which can create a short circuit and catch fire . The various intermediate layers with properties; variables do not try to block the formation of dendrites, but offer an effective solution to contain and control them.
The two electrolytes, in particular, work in tandem : the first is; stable with lithium, but vulnerable to penetration by dendrites; the second, conversely, reacts to lithium, but apparently & egrave; immune to dendrites. This design, among other things, allows the battery to 'self-heal' by filling the holes in the lithium metal left by the dendrites.
AN UNSOLVED REBUS FOR FORTY YEARS 
& Egrave; for forty years that lithium-metal batteries have been theorized, and have been seen in the community; scientific as the & quot; Holy Grail & quot; , due to their very slow decay over time and high density; energy. So far we have not & egrave; still managed to create a stable design. That of Xin Li's team & egrave; very promising, but for the moment it is only an experimental model: the difficult one, as usual, will be; go from a proof of concept made in the laboratory to a product built in series. There will be some practical challenges to be solved, but the team of researchers & egrave; very confident. BMW has promised this technology on the road by 2025.
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