5 years ago

Zn/MnO2 Battery Chemistry With H+ and Zn2+ Coinsertion

Zn/MnO2 Battery Chemistry With H+ and Zn2+ Coinsertion
Chunsheng Wang, Fei Wang, Fudong Han, Xiulin Fan, Min Zhu, Wei Sun, Renzong Hu, Tao Gao, Zhaohui Ma, Chongyin Yang, Singyuk Hou
Rechargeable aqueous Zn/MnO2 battery chemistry in a neutral or mildly acidic electrolyte has attracted extensive attention recently because all the components (anode, cathode, and electrolyte) in a Zn/MnO2 battery are safe, abundant, and sustainable. However, the reaction mechanism of the MnO2 cathode remains a topic of discussion. Herein, we design a highly reversible aqueous Zn/MnO2 battery where the binder-free MnO2 cathode was fabricated by in situ electrodeposition of MnO2 on carbon fiber paper in mild acidic ZnSO4+MnSO4 electrolyte. Electrochemical and structural analysis identify that the MnO2 cathode experience a consequent H+ and Zn2+ insertion/extraction process with high reversibility and cycling stability. To our best knowledge, it is the first report on rechargeable aqueous batteries with a consequent ion-insertion reaction mechanism.

Publisher URL: http://dx.doi.org/10.1021/jacs.7b04471

DOI: 10.1021/jacs.7b04471

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