Lithium-Sulfur batteries, the University? of Michigan promises a life of 1,000 cycles


Battery development? very important to advance electric cars . We know how much companies related to the automotive sector are investing in this field. Thanks to this work, current lithium accumulators have achieved good performance. Obviously, the research goes on and new solutions are being experimented continuously that are able to make the batteries make that leap forward that would significantly improve the autonomy of vehicles and thus favor the spread of electric cars.

Is a technology very interesting? that of Lithium-Sulfur batteries ? (Li-S). On paper, in fact, it promises to significantly improve the autonomy of cars not to mention that the Sulfur? a material that you can? find easily. These accumulators, therefore, could be more? cheaper than the current ones. There? a problem, however, Lithium-Sulfur batteries degrade easily .

The most important reason? common for short life cycles in Lithium-Sulfur batteries? the formation of? dendrites which can significantly reduce the life of the cells. Another problem concerns what is commonly called “ shuttle effect ” which substantially leads to a continuous loss of active material from the electrode, thus shortening the process. the life of the cell. The lithium polysulphides can migrate from the cathode to the anode, consuming the lithium, and then chain repeating this reaction which therefore leads to a reduction in the life of the cells.

The led team? Professor Nicholas Kotov of the University? of Michigan seems to have found a good solution to solve the problems of this battery technology. at the expense, however, of very important parameters such as capacity, speed? charging and safety.

The researchers therefore developed a new cell separator called np-ANF that uses aramid nanofibers to block lithium polysulphides ? and let the lithium ions pass instead. According to ? It was said, in real conditions, the Lithium-Sulfur cells made with this technology should be able to last for about 1,000 charge/discharge cycles equal to a life of 10 years.

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