Effect of Multiple Cation Electrolyte Mixtures on Rechargeable Zn–MnO2 Alkaline Battery

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• 作者：Benjamin J. Hertzberg ; An Huang ; Andrew Hsieh ; Mylad Chamoun ; Greg Davies ; Joon Kyo Seo ; Zhong Zhong ; Mark Croft ; Can Erdonmez ; Ying Shirley Meng ; Dan Steingart
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：July 12, 2016
• 年：2016
• 卷：28
• 期：13
• 页码：4536-4545
• 全文大小：659K
• 年卷期：0
• ISSN：1520-5002

文摘

A Bi₂O₃ in β-MnO₂ composite cathode material has been synthesized using a simple hydrothermal method and cycled in a mixed KOH–LiOH electrolyte with a range of concentrations. We show that, at a KOH:LiOH molar ratio of 1:3, both proton insertion and lithium insertion occur, allowing access to a higher fraction of the theoretical capacity of the MnO₂ while preventing the formation of ZnMn₂O₄. This enables a capacity of 360 mAh/g for over 60 cycles, with cycling limited more by anode properties than traditional cathodic failure mechanisms. The structural changes occurring during cycling are characterized using electron microscopy and in situ synchrotron energy-dispersive X-ray diffraction (EDXRD) techniques. This mixed electrolyte shows exceptional cyclability and capacity and can be used as a drop-in replacement for current alkaline batteries, potentially drastically improving their cycle life and creating a wide range of new applications for this energy storage technology.