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Facile synthesis of hollow urchin-like NiCo2O4 microspheres for high-performance sodium-ion batteries

Zhang, X. Q., Zhao, Y. C., Wang, C. G., Li, X., Liu, J. D., Yue, G. H., Zhou, Z. D.
Journal of materials science 2016 v.51 no.20 pp. 9296-9305
Ostwald ripening, annealing, batteries, electrochemistry, electrodes, nanowires, surface area
Hollow urchin-like NiCo₂O₄ microspheres were facilely synthesized by a simple hydrothermal approach combined with subsequent annealing process. The three-dimensional architectures with hollow structure are formed by the mechanism of the nanowires self-assembly associate with the subsequent Ostwald ripening process. The as-obtained NiCo₂O₄ microspheres with the average diameter of about 5 μm consist of numerous radial nanowires and benefited from the hollow urchin-like microsphere structure, Brunauer–Emmett–Teller results show that it possesses a large specific surface area of 92.8 m² g⁻¹, when it was applied as an electrode material for sodium-ion batteries, the NiCo₂O₄ electrode displayed a high invertible capacity of ~440 mAh g⁻¹ after 200 cycles at a current density of 100 mA g⁻¹, and the electrochemical measurement results also indicated the NiCo₂O₄ electrode possess a charming rate capability. These results suggest a promising application of the hollow urchin-like NiCo₂O₄ microspheres for the advanced sodium-ion batteries.