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Erratum: “High capacity and excellent cycling stability of branched cobalt oxide nanowires as Li-insertion materials” [Appl. Phys. Lett. 97, 043501 (2010)]
Hierarchical nanostructures which can be directly grown on conducting substrate are new trends in the design of active materials for high performance lithium-ion batteries (LIBs). This article reports our design and fabrication of a three-dimensional (3D) hierarchical ZnCo2O4 nanostructure (3D-ZCO-NS) directly on Ni foams. The goose feather-like ZnCo2O4 bundled into a loose array structure with large electrolyte contact area and good electrical and mechanical connection to the current collector. Electrochemical measurements confirmed the good performance of the electrode for reversible Li+ storage (specific capacity of 932 mAh g-1 in the 50th cycle at 1 A g-1) relative to a pasted electrode of 3D-ZCO-NSs (599 mAh g-1 in the 50th cycle at 0.1 A g-1).
In this paper, the authors report the high-performance lithium storage properties of branched cobalt oxide nanowires synthesized through a topotactic conversion route. Compared with other nanosized materials, such branched nanostructures not only inherit the advantages of high surface-to-volume ratio and good dispersion but also show better electronic contact and conduction between nanobuilding units. Both features facilitate charge transport and insertion/extraction of Li ions and lead to higher capacity and better cycling stability compared with other transition metal oxide nanomaterials. Under the condition of high current density of 100 mA/g, the reversible capacity after 50 cycles is up to 1043 mAhg−1 with an average fading rate of 0.15% per cycle.