Rechargeable Zn-MnO batteries with mild and nearly neutral aqueous electrolytes have shown great potential for large-scale energy storage because of their high safety, low cost, environmental friendliness and high energy density. However, MnO cathode materials usually have disadvantages such as low capacity and poor cycling stability, which limit the development of Zn-MnO batteries. In this study, mesoporous MnO nanospheres were prepared by Mg ion pre-intercalation a simple chemical method. The prepared MnO shows a high reversible capacity (247 mA h g at 0.3 A g), excellent cycling stability (a capacity retention of 93% over 800 cycles at 0.8 A g) and good rate performance. The GITT, EIS, XRD, XPS and SEM show that the zinc storage mechanism of MnO should be H/Zn co-intercalation/de-intercalation. This research could provide specific inspiration and promotion for the development and mechanism research of high-performance rechargeable Zn-MnO batteries.
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