New lithium-air battery can still be used after charging and discharging 750 times

New lithium-air battery can still be used after charging and discharging 750 times

According to the report of the US "Daily Science" website on the 21st, American scientists have designed a new type of lithium air battery that can work under natural air conditions and still work after a record-breaking 750 charge/discharge cycles. Researchers said that this lithium-air battery is expected to set off a new revolution in the field of batteries. Related papers were published in the latest edition of Nature magazine.

Lithium-air batteries achieve discharge through the combination of lithium and lithium in the air to form lithium peroxide; charging is then reversed by applying a current to reverse this process. Compared with the lithium ion [y1] technology prevailing in current rechargeable batteries, lithium air batteries theoretically can store much more energy, but their development faces several major obstacles.

Zhang Xinbo, a researcher at the State Key Laboratory of Rare Earths Resources Utilization of the Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, explained to the reporter of Science and Technology Daily: First, the lithium cathode [y2] will oxidize, and due to the presence of carbon dioxide and water vapor, it will generate a large number of harmful vices at the cathode. product. Therefore, most lithium-air batteries cannot work long-term in a truly natural air environment. In addition, because oxygen is an oxidizer, it can also pose a serious safety risk.

In the latest study, the research team from the University of Illinois and Argonne National Laboratory has modified the anode, cathode and electrolyte (the three main components of the battery) of the lithium-air battery, overcoming these unique combinations. challenge.

They coated a thin layer of lithium carbonate on the lithium cathode. This layer allows lithium ions from the cathode to enter the electrolyte while preventing other compounds from reaching the anode. In addition, the anode of the new battery innovatively uses molybdenum disulfide as a catalyst; in addition, the new electrolyte is made of an ionic liquid and dimethyl sulfoxide (a common component of the battery electrolyte), which can promote the production of lithium peroxide. A major electrochemical reaction greatly reduces the occurrence of other side reactions and improves the efficiency of the battery.

Zhang Xinbo said: "This new battery design concept has greatly expanded the practical application of lithium-air batteries, and can attract more researchers to invest in them, and vigorously promote the application of lithium-air batteries."

However, researchers say that there is still much work to be done to commercialize the latest experimental batteries. Zhang Xinbo also pointed out that the cost of electrolyte in the battery can not be ignored. (Reporter Liu Xia)

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