Abstract
Micronanosized LiNi0.5Mn1.5O4 nanorods coated with reduced graphene oxide is successfully synthesized by a hydrothermal-assembly method. The as-prepared samples are characterized by X-ray diffraction, Raman spectroscopy, field emission scanning electron microscope, and electrochemical tests. The XRD and Raman results show that the LiNi0.5Mn1.5O4 nanorods have disordered structure of Fd-3m space group. The SEM characterization exhibits that LiNi0.5Mn1.5O4 nanorods are about 200–400 nm in diameter, and the RGO is well dispersed on the surface of LiNi0.5Mn1.5O4 nanorods. Moreover, a RGO layer coated on the surface of LiNi0.5Mn1.5O4 can suppress the interfacial side reactions. The electrochemical tests show that the RGO-LNMO composites reveal high specific capacity and excellent cyclic stability at high rates. The 1%-RGO-LNMO composite can still possess the capacity of 71.4 mAh g−1 and excellent capacity retention about 99% after 1000 cycles at 10 C rate. The excellent performance of RGO-LNMO composites makes it a promising candidate as lithium-ion battery cathode materials.
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Acknowledgments
This research is supported by the Natural Science Foundation of Shandong Province (ZR2018MEM017) and the Science and Technology Program of Weihai (2015DXGJMS017). The authors also greatly appreciate HIT & Yun Shan Group Research and Development on Graphite Area.
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Chen, Q., Liu, H., Hao, J. et al. Synthesis and characterization of high-performance RGO-modified LiNi0.5Mn1.5O4 nanorods as a high power density cathode material for Li-ion batteries. Ionics 25, 99–109 (2019). https://doi.org/10.1007/s11581-018-2574-7
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DOI: https://doi.org/10.1007/s11581-018-2574-7