Reversible aqueous zinc/manganese oxide energy storage from conversion reactions

Huilin Pan, Yuyan Shao (), Pengfei Yan, Yingwen Cheng, Kee Sung Han, Zimin Nie, Chongmin Wang, Jihui Yang, Xiaolin Li, Priyanka Bhattacharya, Karl T. Mueller and Jun Liu ()
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Huilin Pan: Energy & Environment Directorate, Pacific Northwest National Laboratory
Yuyan Shao: Energy & Environment Directorate, Pacific Northwest National Laboratory
Pengfei Yan: Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory
Yingwen Cheng: Energy & Environment Directorate, Pacific Northwest National Laboratory
Kee Sung Han: Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory
Zimin Nie: Energy & Environment Directorate, Pacific Northwest National Laboratory
Chongmin Wang: Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory
Jihui Yang: University of Washington
Xiaolin Li: Energy & Environment Directorate, Pacific Northwest National Laboratory
Priyanka Bhattacharya: Energy & Environment Directorate, Pacific Northwest National Laboratory
Karl T. Mueller: Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory
Jun Liu: Energy & Environment Directorate, Pacific Northwest National Laboratory

Nature Energy, 2016, vol. 1, issue 5, 1-7

Abstract: Abstract 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, α-MnO2, are used as the cathode. We show that a chemical conversion reaction mechanism between α-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.

Date: 2016
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DOI: 10.1038/nenergy.2016.39

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