Facile preparation of Mn ₃ O ₄ octahedra and their long-term cycle life as an anode material for Li-ion batteries

We describe the simple preparation of octahedral Mn3O4 nanomaterials with a typical diameter around 300–400 nm using a one step dealloying of MnAl alloy at room temperature. The as-made sample exhibits high performance as an anode material for Li-ion batteries. Electrochemical measurements reveal that the Mn3O4 octahedra have an ultralong cycle life with capacity retentions of 81.3% and 77.8% after 500 cycles at 100 and 300 mA g−1, respectively. Moreover, the Mn3O4 octahedra deliver a stable capacity at a high rate of 1000 mA g−1 with a good rate capability. The as-made Mn3O4 octahedra exhibit great potential for application as anode materials for Li-ion batteries with the advantages of unique performance and easy preparation.