Journal
NATURE ENERGY
Volume 1, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NENERGY.2016.39
Keywords
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Funding
- US Department of Energy (DOE), Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [KC020105-FWP12152]
- Department of Energy's Office of Biological and Environmental Research
- Inamori Foundation
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Rechargeable aqueous batteries such as alkaline zinc/manganese oxide batteries are highly desirable for large-scale energy storage owing to their low cost and high safety; however, cycling stability is a major issue for their applications. Here we demonstrate a highly reversible zinc/manganese oxide system in which optimal mild aqueous ZnSO4-based solution is used as the electrolyte, and nanofibres of a manganese oxide phase, alpha-MnO2, are used as the cathode. We show that a chemical conversion reaction mechanism between alpha-MnO2 and H+ is mainly responsible for the good performance of the system. This includes an operating voltage of 1.44 V, a capacity of 285 mAh g(-1) (MnO2), and capacity retention of 92% over 5,000 cycles. The Zn metal anode also shows high stability. This finding opens new opportunities for the development of low-cost, high-performance rechargeable aqueous batteries.
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