Abstract
HighlightsThe concurrent application of vacancy enrichment and surface coating in β-MnO2 electrode can both improve the intercalation kinetics and inhibit the Mn dissolution.The oxygen-deficient β-MnO2@graphene oxide electrode delivers a reversible capacity of 129.6 mAh g−1 after 2000 cycles at 4C, outperforming the state-of-the-art MnO2-based cathodes.The excellent performance is rooted in the strong binding of graphene oxide on defective β-MnO2 and the regulated structural evolution into the ZnxMn2O4 phase.
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