A Rechargeable Li鈥揙2 Battery Using a Lithium Nitrate/N,N-Dimethylacetamide Electrolyte

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• 作者：Wesley Walker ; Vincent Giordani ; Jasim Uddin ; Vyacheslav S. Bryantsev ; Gregory V. Chase ; Dan Addison
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：February 13, 2013
• 年：2013
• 卷：135
• 期：6
• 页码：2076-2079
• 全文大小：334K
• 年卷期：v.135,no.6(February 13, 2013)
• ISSN：1520-5126

文摘

A major challenge in the development of rechargeable Li鈥揙₂ batteries is the identification of electrolyte materials that are stable in the operating environment of the O₂ electrode. Straight-chain alkyl amides are one of the few classes of polar, aprotic solvents that resist chemical degradation in the O₂ electrode, but these solvents do not form a stable solid-electrolyte interphase (SEI) on the Li anode. The lack of a persistent SEI leads to rapid and sustained solvent decomposition in the presence of Li metal. In this work, we demonstrate for the first time successful cycling of a Li anode in the presence of the solvent, N,N-dimethylacetamide (DMA), by employing a salt, lithium nitrate (LiNO₃), that stabilizes the SEI. A Li鈥揙₂ cell containing this electrolyte composition is shown to cycle for more than 2000 h (>80 cycles) at a current density of 0.1 mA/cm² with a consistent charging profile, good capacity retention, and O₂ detected as the primary gaseous product formed during charging. The discovery of an electrolyte system that is compatible with both electrodes in a Li鈥揙₂ cell may eliminate the need for protecting the anode with a ceramic membrane.