Interphase Evolution of a Lithium-Ion/Oxygen Battery

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• 作者：Giuseppe Antonio Elia ; Dominic Bresser ; Jakub Reiter ; Philipp Oberhumer ; Yang-Kook Sun ; Bruno Scrosati ; Stefano Passerini ; Jusef Hassoun
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：October 14, 2015
• 年：2015
• 卷：7
• 期：40
• 页码：22638-22643
• 全文大小：406K
• ISSN：1944-8252

文摘

A novel lithium-ion/oxygen battery employing Pyr₁₄TFSI-LiTFSI as the electrolyte and nanostructured Li_xSn鈥揅 as the anode is reported. The remarkable energy content of the oxygen cathode, the replacement of the lithium metal anode by a nanostructured stable lithium-alloying composite, and the concomitant use of nonflammable ionic liquid-based electrolyte result in a new and intrinsically safer energy storage system. The lithium-ion/oxygen battery delivers a stable capacity of 500 mAh g^鈥? at a working voltage of 2.4 V with a low charge鈥揹ischarge polarization. However, further characterization of this new system by electrochemical impedance spectroscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy reveals the progressive decrease of the battery working voltage, because of the crossover of oxygen through the electrolyte and its direct reaction with the Li_xSn鈥揅 anode.