From：CTECHI GROUP Limited Release time：2018-09-14
Overview：Dr. Andrew Morris said: "This is a great victory for computational materials science. We predicted how phosphorus would behave as an electrode in 2016 and were now reality, with the viewpoints of Professor Grey's team into experiment and learn to make our predictions better. It's amazing how powerful linking theory with experiment approaches are."
Scientists are paving the way to swap the lithium in aa li ion rechargeable batteries with sodium, according to research published in the Journal of the American Chemical Society.
aaa Lithium ion batteries are rechargeable and are widely used in laptops, smart phones and many other electric devices or vehicles. The electric vehicle is a widely advocated technology for fighting pollution in cities and realising an era of clean sustainable transport.
However lithium is really expensive and resources are unbalancedly distributed on the earth. Incredible amounts of drinking water are used in extracting lithium and extraction techniques are becoming more energy-consuming as lithium demand grows – an 'own goal' in terms of sustainability.
With the rapidly growing demand for electric cars, the need for reliable rechargeable batteries also is becoming more and more, so there is hot interest in finding a charge carrier other than lithium that is cheap and easily accessible.
Sodium is affordable and can be found in seawater so is virtually infinite. However, sodium is a larger ion than lithium, so it is not possible to simply "swap" it for lithium in current technologies. For example, unlike lithium, sodium will not fit between the carbon layers of the ubiquitous LIB anode, graphite.
The scientists needed to find new substitutes to act as battery components for sodium-ion batteries that will compete with lithium for capacity, charge speed, energy and power density.
Running quantum mechanical models on supercomputers, the scientists had the ability to predict what happens when sodium is inserted into phosphorus.
In collaboration with Dr. Lauren Marbella and Professor Clare Grey's team at the University of Cambridge, who conducted the experiments to prove the predictions, they found that the phosphorus forms helices at intermediate stages of charging.
The scientists identified the final composition of the electrode, which provides a final capacity of charge carriers seven times that of graphite for the same weight. This gives us fresh viewpoints into making high-capacity sodium-ion anodes.
Dr. Andrew Morris said: "This is a great victory for the advancemen of rechargeable battery. We predicted how phosphorus would behave as an electrode in 2016 and were now reality, with the viewpoints of Professor Grey's team into experiment and learn to make our predictions better. It's amazing how powerful linking theory with experiment approaches are."
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