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• W3028304003 endingPage "136445" @default.
• W3028304003 startingPage "136445" @default.
• W3028304003 abstract "Abstract Adding Mn2+ in aqueous electrolyte is a well adopted approach to improve cycle performance for Zn/MnO2 batteries. The function of Mn2+ additive in aqueous electrolyte, however, is not well understood, which could affect revealing the real performance of the MnO2 cathode itself. In this work, a battery system with Zn anode and birnessite MnO2 cathode is constructed and systematically investigated by using MnSO4 additive in the electrolyte with different concentrations. The function of Mn2+ in the electrolyte, the structural evolution of the electrode, the reaction mechanism, and the cause for capacity fading are comprehensively investigated in this system. It is found that Mn2+ can be continuously electro-oxidized at the cathode and form e-MnO2 when the charge voltage is above 1.7 V during cycling, leading to successive capacity increase up to hundreds of cycles. The capacity increase, however, stops after certain cycle numbers, and is followed by fast capacity fading, which is correlated to the competition between e-MnO2 formation and phase transition from birnessite to spinel ZnMn2O4. It is suggested that addition of Mn2+ in the electrolyte cannot stabilize the MnO2 cathode and the improved cycle performance is achieved at the expense of consuming the Mn2+ in the electrolyte." @default.
• W3028304003 created "2020-05-29" @default.
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• W3028304003 date "2020-08-01" @default.
• W3028304003 modified "2023-10-16" @default.
• W3028304003 title "The function of Mn2+ additive in aqueous electrolyte for Zn/δ-MnO2 battery" @default.
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• W3028304003 doi "https://doi.org/10.1016/j.electacta.2020.136445" @default.
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