Created a battery with a specific capacity of seven times more than that of lithium-ion batteriesOctober 3, 2019
Employees of the University of Chicago campus of Illinois created the first working prototype of a lithium carbon dioxide battery. Such a battery has an energy storage density of seven times that of lithium-ion.
The results of the study are published in the journal Advanced Materials. The document says that scientists managed to get rid of the main drawback of lithium-carbon dioxide batteries (Li – CO₂): a small number of recharge cycles (about 100) caused by carbon evolution during chemical reactions. To do this, it was necessary to change the composition of the electrolyte: molybdenum disulfide was added to dimethyl sulfoxide, which conducts ions well.
The hybrid electrolyte allowed us to start a reversible electrochemical cycle, which completely neutralizes CO₂, and achieve 500 recharge cycles. The energy storage density of such a battery is 1876 watt-hours per kilogram of mass, which is seven times more than current lithium-ion batteries can offer. Lithium-sulfur power sources have even greater potential: their theoretical specific capacity is 2600 watt-hours per kilogram.
Last December, employees of the Honda Research Institute, together with scientists from the California Institute of Technology and the NASA Jet Propulsion Laboratory, developed a new type of electrolyte that will create batteries with a high charge storage density and low operating temperature. Thanks to him, scientists have made a solid-state fluoride-ion battery that works at room temperature.
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