期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 41, 页码 37524-37530出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b09252
关键词
mild aqueous Zn-MnO2 batteries; electrolytic manganese dioxide; reaction mechanism; mixed charge storage; electrolyte effect
资金
- U.S. Department of Energy (DOE) Office of Electricity Delivery and Energy Reliability [57558]
- Pacific Northwest National Laboratory
- DOE [DE-AC05-76RL01830]
Recently, mild aqueous rechargeable Zn-MnO2 batteries have attracted increasing interest for energy storage due to the low cost of Zn and Mn resources, high safety, and environmental benignity. Extensive types of MnO2 have been proposed as the cathodes in the literature, but the different reported performance and lack of a thorough understanding of reactions in MnO2 cathodes greatly hinder the practical applications of mild aqueous Zn-MnO2 batteries. Here, we revealed the correlation between the reaction mechanisms and the used electrolytes for the mild aqueous zinc-electrolytic manganese dioxide (EMD) batteries. In optimal Zn(TFSI)(2)-based electrolyte, the EMD cathode exhibits a mixed diffusion-controlled conversion reaction between EMD and H+ and diffusion-free pseudocapacitance-like reactions. This mechanism enables excellent cycling stability of an EMD cathode over 5000 cycles with a capacity retention of 94.6%. This study provides a useful insight into developing reversible MnO2 cathodes through rational control of reaction mechanisms for high performance mild aqueous Zn-MnO2 batteries.
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