Toward a Sodium–“Air” Battery: Revealing the Critical Role of Humidity
Toward a Sodium–“Air” Battery: Revealing the Critical Role of Humidity
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DOI：
10.1021/acs.jpcc.5b02673
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发表时间：
2015-06
影响因子：
3.7
通讯作者：
Qian Sun;H. Yadegari;M. Banis;Jian Liu;B. Xiao;Xia Li;Craig Langford;Ruying Li;X. Sun
中科院分区：
文献类型：
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作者：
Qian Sun;H. Yadegari;M. Banis;Jian Liu;B. Xiao;Xia Li;Craig Langford;Ruying Li;X. Sun
室温钠空气电池具有与锂空气电池类似的设计和概念。使用环境空气代替纯氧作为氧源是具有挑战性的，因为空气中的微量组分可能导致各种副反应并影响电化学反应路线。虽然水是空气中不可忽视的成分，但它对锂和钠空气电池的影响往往被低估。本研究通过电化学循环和循环伏安测试系统研究了钠-空气电池在不同相对湿度（RH）下的电化学行为，并通过XRD、FT-IR和SEM等物理表征手段对相应放电产物进行了鉴定。揭示和讨论了钠-空气电池在潮湿条件下的反应机理。Na-空气电池比Li-空气电池受到空气中含水量的更严重的影响。在潮湿环境中，发现NaOH及其衍生物的形成，并被证明对细胞是致命的。
Room temperature sodium–air batteries have a similar design and concept as lithium–air 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– and Na–air batteries is often underestimated. In this study, the electrochemical behavior of Na–air 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–air batteries under humid conditions are revealed and discussed. Na–air batteries suffer from more severe impact from the water content in air than Li–air batteries. NaOH and its derivatives are found to form and are proven to be fatal to the cells under humid ambien...