Effect of Ce-doped MnO₂ catalyst on the lithium-air batteryperformance in the ambient atmosphere

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• 作者：Kun He ; Yongming Zhu ; Haihao Shi
• 关键词：MnO2 ; Ce dopant ; Hydrothermal reaction ; Lithium ; air batteries
• 刊名：Ionics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：23
• 期：2
• 页码：385-393
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Electrochemistry; Renewable and Green Energy; Optical and Electronic Materials; Condensed Matter Physics; Energy Storage;
• 出版者：Springer Berlin Heidelberg
• ISSN：1862-0760
• 卷排序：23

文摘

MnO₂ doped with Ce was hydrothermally synthesized and the as-made breathable waterproof membrane used outside the cathode was prepared for improving the lithium-air battery performance in air. The samples were characterized by scanning electron microscopy (SEM), energy dispersive spectrum analysis (EDS), charge–discharge cycle tests, charge–discharge cycle tests of limited capacity, and electrochemical impedance spectroscopy (EIS) tests. The result showed that Ce_xMn_1-xO₂ can effectively reduce the charge overpotential of the cathode. The charge and discharge electrical potential difference of Ce_0.1Mn_0.9O₂ was only 700 mV while MnO₂’s was 2100 mV. And Ce_0.1Mn_0.9O₂ that exhibited high discharge capacity of 400 mAh g−1 in air had a stable discharge platform of 2.5 V and then the more obvious charge phenomenon appeared after 3.5 V. The excellent catalysis, the effect of cathode catalytic materials named Ce_xMn_1-xO₂, may attribute to the decrease of reaction potential energy of oxygen reduction reaction and oxygen evolution reaction.