Toward a Sodium鈥撯€淎ir鈥?Battery: Revealing the Critical Role of Humidity

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• 作者：Qian Sun ; Hossein Yadegari ; Mohammad N. Banis ; Jian Liu ; Biwei Xiao ; Xia Li ; Craig Langford ; Ruying Li ; Xueliang Sun
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：June 18, 2015
• 年：2015
• 卷：119
• 期：24
• 页码：13433-13441
• 全文大小：406K
• ISSN：1932-7455

文摘

Room temperature sodium鈥揳ir batteries have a similar design and concept as lithium鈥揳ir batteries. Using ambient air instead of pure oxygen as oxygen source is challenging because the minor components in air could lead to various side reactions and influence the electrochemical reaction route. Although water is an innegligible component in air, its impact on Li鈥?and Na鈥揳ir batteries is often underestimated. In this study, the electrochemical behavior of Na鈥揳ir batteries under different relative humidity (RH) has been systemically investigated by galvanic cycling and cyclic voltammetry tests, as well as the identification of corresponding discharge products by physical characterizations such as XRD, FT-IR, and SEM. The reaction mechanisms of Na鈥揳ir batteries under humid conditions are revealed and discussed. Na鈥揳ir batteries suffer from more severe impact from the water content in air than Li鈥揳ir batteries. NaOH and its derivatives are found to form and are proven to be fatal to the cells under humid ambience. Understanding the reaction mechanisms occurred in sodium air batteries under dry and humid ambient is critical to design and develop sodium鈥揳ir batteries of high performance and long durability.