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

摘要

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 300 mA g(-1) and from 15.8 to 43.8% after 200 cycles at 1000 mA g(-1), respectively. Even the current rates reach up to 2000 and 3000 mA g(-1) Mn3O4@G electrode could still hold the highly stable capacities around 520 and 430 mA h g(-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. (C) 2017 Elsevier Inc. All rights reserved.