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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.