Abstract
Hierarchical NiO/Ni3V2O8 nanoplatelet arrays (NPAs) grown on Ti foil were prepared as free-standing anodes for Li-ion batteries (LIBs) via a simple one-step hydrothermal approach followed by thermal treatment to enhance Li storage performance. Compared to the bare NiO, the fabricated NiO/Ni3V2O8 NPAs exhibited significantly enhanced electrochemical performances with superior discharge capacity (1169.3 mA h g−1 at 200 mA g−1), excellent cycling stability (570.1 mA h g−1 after 600 cycles at current density of 1000 mA g−1) and remarkable rate capability (427.5 mA h g−1 even at rate of 8000 mA g−1). The excellent electrochemical performances of the NiO/Ni3V2O8 NPAs were mainly attributed to their unique composition and hierarchical structural features, which not only could offer fast Li+ diffusion, high surface area and good electrolyte penetration, but also could withstand the volume change. The ex situ XRD analysis revealed that the charge/discharge mechanism of the NiO/Ni3V2O8 NPAs included conversion and intercalation reaction. Such NiO/Ni3V2O8 NPAs manifest great potential as anode materials for LIBs with the advantages of a facile, low-cost approach and outstanding electrochemical performances.
Highlights
Li-ion batteries (LIBs) have attracted much interest as electrochemical energy storage devices due to their outstanding performances in terms of high energy density, high voltage, long lifespan and environmental benignity.[1,2,3] conventional graphite anodes have a low theoretical capacity (372 mA h gÀ1), which hardly meets the growing energy demand for various consumer electronic devices
We described a facile one-step hydrothermal approach to fabricate a hierarchical Nickel oxide (NiO)/Ni3V2O8 nanoplatelet arrays (NPAs) directly grown on Ti foil, followed by thermal treatment
The Ni/V atomic ratio determined by ICP technique of two specimens was about 7.58 : 1 (Table S1†), corresponding to 30.8% of Ni3V2O8 in NiO/Ni3V2O8 NPAs
Summary
Li-ion batteries (LIBs) have attracted much interest as electrochemical energy storage devices due to their outstanding performances in terms of high energy density, high voltage, long lifespan and environmental benignity.[1,2,3] conventional graphite anodes have a low theoretical capacity (372 mA h gÀ1), which hardly meets the growing energy demand for various consumer electronic devices. Transition metal oxides (TMOs) exhibit great speci c capacities, high volumetric energy densities and intrinsically enhanced safety, making them the supposed alternative anode materials for LIBs.[4,5,6,7,8].
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