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Core-shell ZnCo 2 O 4 @TiO 2 nanowall arrays as anodes for lithium ion batteries.

Nanotechnology 2017 April 22
In this paper ZnCo2 O4 nanowall arrays (NWAs) were first obtained through self-assembly followed by calcination. Then atomic layer deposition was used to fabricate core-shell ZnCo2 O4 @TiO2 NWAs as anode materials for lithium ion batteries (LIBs). The hierarchical NWA nanostructure has fast ion diffusion and electron transport at the electrode/electrolyte interface, while the excellent chemical stability of the TiO2 shell can protect the ZnCo2 O4 NWAs from volume expansion during the charge and discharge processes. The core-shell ZnCo2 O4 @TiO2 core-shell NWAs composite is versatile as an anode material and exhibits enhanced electrochemical performance for LIBs. The initial capacity was 1598 mA h g-1 (Coulombic efficiency reached 84.0%), and the reversible capacity after 90 cycles was 827 mA h g-1 at a current density of 100 mA g-1 , showing high capacity and good cycling stability (much better than ZnCo2 O4 NWAs). The ZnCo2 O4 @TiO2 nanocomposite also showed excellent rate capability with a reversible capacity of 532 mA h g-1 even at a current rate of 4500 mA g-1 . The encouraging experimental results suggest that the novel core-shell structure NWAs have great potential for practical applications in LIBs.

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