Well encapsulated Mn₃O₄ octahedra in graphene nanosheets with much enhanced Li-storage performances

Mn₃O₄@graphene (Mn₃O₄@G) nanocomposite is easily fabricated through a facile preparation of Mn₃O₄ octahedra by dealloying MnAl alloy and a following reduction of coassembled aggregates of Mn₃O₄ octahedra and graphene oxide. Benefitting from the distinctive nanostructure and the hybridization with well-conductive graphene, the capacity retentions of Mn₃O₄@G are dramatically improved from 25.5 to 58.0% after 100 cycles at 300mAg^-1 and from 15.8 to 43.8% after 200 cycles at 1000mAg^-1, respectively. Even the current rates reach up to 2000 and 3000mAg^-1, Mn₃O₄@G electrode could still hold the highly stable capacities around 520 and 430mAhg^-1, respectively. On account of the superiorities of high electrochemical performances and easy preparation, the Mn₃O₄@G composite shows encouraging application potential to be an advanced anode material for lithium storage.