title: Core-shell ZnCo2O4@TiO2nanowall arrays as anodes for lithium ion batteries.
abstract: In this paper ZnCo2O4nanowall arrays (NWAs) were first obtained through self-assembly followed by calcination. Then atomic layer deposition was used to fabricate core-shell ZnCo2O4@TiO2NWAs 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 TiO2shell can protect the ZnCo2O4NWAs from volume expansion during the charge and discharge processes. The core-shell ZnCo2O4@TiO2core-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-1at a current density of 100 mA g-1, showing high capacity and good cycling stability (much better than ZnCo2O4NWAs). The ZnCo2O4@TiO2nanocomposite also showed excellent rate capability with a reversible capacity of 532 mA h g-1even 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.
authors.affiliation: School of Physics and Electronics, State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, People's Republic of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Shi
authors.forename: Haitao
authors.initials: H
authors.lastname: Zhao
authors.forename: Bingan
authors.initials: B
authors.lastname: Lu