A Low-Overpotential Potassium鈥揙xygen Battery Based on Potassium Superoxide

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• 作者：Xiaodi Ren ; Yiying Wu
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：February 27, 2013
• 年：2013
• 卷：135
• 期：8
• 页码：2923-2926
• 全文大小：326K
• 年卷期：v.135,no.8(February 27, 2013)
• ISSN：1520-5126

文摘

Li鈥揙₂ battery is regarded as one of the most promising energy storage systems for future applications. However, its energy efficiency is greatly undermined by the large overpotentials of the discharge (formation of Li₂O₂) and charge (oxidation of Li₂O₂) reactions. The parasitic reactions of electrolyte and carbon electrode induced by the high charging potential cause the decay of capacity and limit the battery life. Here, a K鈥揙₂ battery is report that uses K⁺ ions to capture O₂^{鈥?/sup> to form the thermodynamically stable KO₂ product. This allows for the battery to operate through the one-electron redox process of O₂/O₂鈥?/sup>. Our studies confirm the formation and removal of KO₂ in the battery cycle test. Furthermore, without the use of catalysts, the battery shows a low discharge/charge potential gap of less than 50 mV at a modest current density, which is the lowest one that has ever been reported in metal鈥搊xygen batteries.}