Abstract
In this paper, the urchin-like NiCo2O4 microspheres assembled by using sodium dodecyl sulfate (SDS) as soft template are successfully fabricated by a facile procedure including microemulsion-solvothermal reaction and subsequent calcination at 400 °C for 4 h. The structure and morphology of synthesized NiCo2O4 particles are investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). It has been clearly revealed that the prepared three-dimensional urchin-like NiCo2O4 microspheres are constituted by one-dimension nanowires. As it is applied to anode for lithium-ion batteries (LIBs), the initial coulombic efficiency is up to 75.7%, and the specific reversible capacity retains up to 1034.2 mAh/g even after 40 cycles at a current density of 100 mA/g. Furthermore, as the current density gradually increases to 800 mA/g, it still delivers the reversible capacity of 895.4 mAh/g. The high reversible specific capacity, perfect cyclability, and rate performance are attributed to the unique urchin-like NiCo2O4 microspheres, which can alleviate the volume expansion and shorten the diffusion path of ions and electrons during lithiation/delithiation process. The self-standing urchin-like NiCo2O4 microspheres may be a very promising candidate in place of the commercial graphite-based anode materials for high-performance LIBs.
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Acknowledgements
This research was financially supported by Outstanding Youth Foundation of Hunan Provincial Education Department (No. 15B190), the Planned Science and Technology Project of Science and Technology Bureau of Xiangxi Tujia and Miao Autonomous Prefecture (No. 2) and Research Innovation Project for Graduate Student (CX2017B710, JDY16015), the National Natural Science Foundation of China (Nos. 51704124, 51762017, 51662010, 51472107, and 51672104), and Natural Science Foundation of Hunan Province, China (No. 16JJ6121),which were greatly appreciated.
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Li, Y., Wu, X. Fabrication of urchin-like NiCo2O4 microspheres assembled by using SDS as soft template for anode materials of Lithium-ion batteries. Ionics 24, 1329–1337 (2018). https://doi.org/10.1007/s11581-017-2291-7
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DOI: https://doi.org/10.1007/s11581-017-2291-7