1. Boosting Electrolytic MnO 2 -Zn Batteries by a Bromine Mediator.
- Author
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Zheng X, Wang Y, Xu Y, Ahmad T, Yuan Y, Sun J, Luo R, Wang M, Chuai M, Chen N, Jiang T, Liu S, and Chen W
- Abstract
An aqueous electrolytic MnO
2 -Zn battery with eye-catching Mn2+ /MnO2 cathode chemistry has been attracting immense interest for next-generation energy storage devices due to its irreplaceable advantages. However, the limited MnO2 conductivity restricts its long service life at high areal capacities. Here, we report a high-performance electrolytic MnO2 -Zn battery via a bromine redox mediator, to enhance its electrochemical performance. The MnO2 /Br2 -Zn battery displays a high discharge voltage of 1.98 V with a capacity of ∼5.8 mAh cm-2 . It also shows an excellent rate performance of 20 C with a long-term stability of over 600 cycles. Furthermore, the scaled-up MnO2 /Br2 -Zn battery with a capacity of ∼950 mAh exhibits a stable 100 cycles with a practical cell energy density of ∼32.4 Wh kg-1 and an attractively low energy cost of below 15 US$ kWh-1 . The design approach can be generalized to other electrodes and battery systems, thus opening up new possibilities for large-scale energy storage.- Published
- 2021
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