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Issue 14, 2018
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Unravelling the reaction chemistry and degradation mechanism in aqueous Zn/MnO2 rechargeable batteries

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Abstract

Aqueous Zn/MnO2 rechargeable batteries utilizing a near neutral electrolyte have demonstrated great potential for large-scale energy storage applications, due to their safe and sustainable nature. Nevertheless, the reaction chemistry and degradation process associated with the MnO2-based cathode is not yet fully understood. Herein, a novel reversible Zn/MnO2 battery with zinc hydroxide sulfate (Zn4(OH)6SO4·5H2O, ZHS) as the cathode has been designed, where active MnO2 is formed in situ during the initial charge process from the Mn(II)-containing ZnSO4 electrolyte. A combination of electrochemical and material characterizations reveal two-step redox reactions (Mn(II) ions ⇌ ZnMn2O4 spinel ⇌ layered Zn-birnessite) during the charge–discharge process. Excellent cycling stability with a capacity retention of 100% after 1500 cycles is achieved at 500 mA g−1. The mechanism for long-term capacity fading is also studied. Cycling reversibility is destroyed by the irreversible consumption of Mn(II) to form woodruffite with a tunnel structure and poor electrochemical activity.

Graphical abstract: Unravelling the reaction chemistry and degradation mechanism in aqueous Zn/MnO2 rechargeable batteries

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Publication details

The article was received on 31 Jan 2018, accepted on 06 Mar 2018 and first published on 06 Mar 2018


Article type: Paper
DOI: 10.1039/C8TA01031E
Citation: J. Mater. Chem. A, 2018,6, 5733-5739
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    Unravelling the reaction chemistry and degradation mechanism in aqueous Zn/MnO2 rechargeable batteries

    S. Zhao, B. Han, D. Zhang, Q. Huang, L. Xiao, L. Chen, D. G. Ivey, Y. Deng and W. Wei, J. Mater. Chem. A, 2018, 6, 5733
    DOI: 10.1039/C8TA01031E

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