(a) In-situ Raman spectroscopy data for the synthesis of LiO2 in liquid ammonia (b) LiO2 synthesized in liquid ammonia produces N2 mass spectrometry data (ce) in liquid ammonia LiO2 is finally converted to LiOH and LiOH • H2O Infrared spectroscopy , Raman spectra and x-ray studies.
Lithium-oxygen batteries have higher theoretical specific energy than lithium-ion batteries, attracting widespread attention from the academic and industrial communities. Lithium-oxygen batteries currently exhibit poor cycling stability due to side reactions between oxygen reduction species (O2−, LiO2 and Li2O2) and battery components (electrode materials and electrolytes). To eliminate these side reactions, the chemical properties of the oxygen reduction species need to be understood in essence. O2− and Li2O2 have been thoroughly studied experimentally and theoretically, and LiO2 is not yet clear because it is not readily available under normal experimental conditions.
The Peng Zhangquan team of the Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, reported a method for synthesizing LiO2 in liquid ammonia (-78°C) and compared the chemical reactivity of O2−, LiO2, and Li2O2 in liquid ammonia. It was first demonstrated experimentally. LiO2 is the most reactive oxygen species in lithium-oxygen batteries, and theoretically gives the reaction mechanism of LiO2 in liquid ammonia. At the same time, it is proved that the shorter the existence time of the LiO2 intermediate product, the higher the reversibility of the lithium-oxygen battery. The research work was titled LiO2:Cryosynthesis and Chemical/Electrochemical Reactivities and was published in The Journal of Physical Chemistry Letters.
Based on an understanding of the chemical properties of the oxygen reduction intermediates of lithium-oxygen batteries, the research team developed a Hexamethylphosphoramide electrolyte system with high chemical and electrochemical stability, which improves the cycle life of the battery compared to the current ether-based electrolytes. . The research work was titled A High-Performance Li-O2 Battery with a Strongly Solvating Hexamethylphosphoramide Electrolyte and a LiPON-Protected Lithium Anode, published on Advanced Materials.
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