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Template-free fabrication of graphene-wrapped mesoporous ZnMn 2 O 4 nanorings as anode materials for lithium-ion batteries.

Nanotechnology 2017 June 17
We rationally designed a facile two-step approach to synthesize ZnMn2 O4 @G composite anode material for lithium-ion batteries (LIBs), involving a template-free fabrication of ZnMn2 O4 nanorings and subsequent coating of graphene sheets. Notably, it is the first time that ring-like ZnMn2 O4 nanostructure is reported. Moreover, our system has been demonstrated to be quite powerful in producing ZnMn2 O4 nanorings regardless of the types of Zn and Mn-containing metal salts reactants. The well-known inside-out Ostwald ripening process is tentatively proposed to clarify the formation mechanism of the hollow nanorings. When evaluated as anode material for LIBs, the resulting ZnMn2 O4 @G hybrid displays significantly improved lithium-storage performance with high specific capacity, good rate capability, and excellent cyclability. After 500 cycles, the ZnMn2 O4 @G hybrid can still deliver a reversible capacity of 958 mAh g-1 at a current density of 200 mA g-1 , much higher than the theoretical capacity of 784 mAh g-1 for pure ZnMn2 O4 . The outstanding electrochemical performance should be reasonably ascribed to the synergistic interaction between hollow and porous ZnMn2 O4 nanorings and the three-dimensional interconnected graphene sheets.

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