https://scholars.lib.ntu.edu.tw/handle/123456789/409005
標題: | Spatial Distributions of Discharged Products of Lithium-Oxygen Batteries Revealed by Synchrotron X-ray Transmission Microscopy | 作者: | Olivares-Mar?n M. Sorrentino A. Lee R.-C. Pereiro E. Wu N.-L. Tonti D. |
關鍵字: | Li2O2;LiO2;Lithium-oxygen batteries;soft X-ray microscopy;toroids | 公開日期: | 2015 | 卷: | 15 | 期: | 10 | 起(迄)頁: | 6932-6938 | 來源出版物: | Nano Letters | 摘要: | The discharge products of ether-based Li-O2 cells were grown directly on common carbon-coated TEM grids and observed by oxidation-state-sensitive full field transmission soft X-ray microscopy (TXM). The acquired data have permitted to quantify and localize with spatial resolution the distribution of the oxygen discharge products in these samples (i.e., lithium superoxide, peroxide, and carbonates) and appreciate several compositional, structural, and morphological aspects. Most of the peroxide particles had a toroidal shape, often with a central hole usually open on only one side, and which included significant amounts of superoxide-like phases (LiO2/Li2O2 ratio between 0.2 and 0.5). Smaller particles had smaller or no superoxide content, from which we infer that abundance of soluble LiO2 may have a role in toroid formation. Significant amount of carbonates were found irregularly distributed on the electrode surface, occasionally appearing as small particles and aggregates, and mostly coating lithium peroxide particles. This suggests the formation of a barrier that, similar to the solid electrolyte interface (SEI) critical in Li-ion batteries, requires an appropriate management for a reversible operation. ? 2015 American Chemical Society. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/409005 | ISSN: | 15306984 | DOI: | 10.1021/acs.nanolett.5b02862 | SDG/關鍵字: | Carbon; Carbonates; Electric batteries; Electrolytes; Lithium-ion batteries; Oxidation; Oxygen; Peroxides; Solid electrolytes; X ray microscopes; LiO2; Lithium-oxygen batteries; Morphological aspects; Soft x-ray microscopy; Solid electrolyte interfaces; Spatial resolution; Synchrotron x rays; toroids; Lithium; lithium; oxygen; chemistry; electron microscopy; power supply; procedures; synchrotron; Electric Power Supplies; Lithium; Microscopy, Electron; Oxygen; Synchrotrons |
顯示於: | 化學工程學系 |
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