“Sixfold improvement. Engineers solved one of the main problems of lithium-ion batteries for electric vehicles on April 7, 18:32 Saved Reading List → Read later: Low temperatures significantly reduce the efficiency of electric cars (photo: Reuters/Vincent West) To accelerate charging at low temperatures by 500%. Modern electric batteries store”, – WRITE ON: ua.news
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Read later Low temperatures significantly reduce electric charging efficiency (photo: Reuters/Vincent West)
Engineers from the University of Michigan modified the process of production of batteries for electric vehicles, which allowed to speed up charging at low temperatures by 500%.
Modern electric batteries store and release energy by moving lithium ions back and forth between electrodes through a liquid electrolyte. At low temperatures, this movement of ions slows down, reducing both the battery power and the charging speed. The team of researchers under the leadership of Nil Dassgupt from the Department of Mechanical Engineering and Materials Science and Engineering at the MU College College has been working on improving the technology of creating such batteries and charging them.
Previously, researchers improved the ability to charge the battery, creating pathways – about 40 microns in size – in the anode, an electrode that receives lithium ions during charging. This significantly accelerated at room temperature, but the low temperatures were still ineffective. The command found the problem: a chemical layer that is formed on the surface of the electrode as a result of the reaction with the electrolyte.
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“This coverage prevents the entire electrode from charging, reducing the battery power again,” said Manoj Jangid, Senior Researcher in the UM and co -author of the study published in Joule journal.
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The command had to prevent the formation of this surface layer. They did it by covering the battery with a glass carbonate boratine material with a thickness of approximately 20 nanometers. Lithium-ion electric vehicles made in this way can be charged 500% faster at low temperatures up to 10 degrees Celsius. Batteries with such modifications retain 97% of their capacity, even after a hundred times fast charging at very low temperatures.