Nanosheets-based ZnO–NiO microspheres for lithium-ion batteries
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Nanosheets-based ZnO–NiO microspheres were synthesized by a simple hydrothermal route combined with subsequent heat treatment at moderate temperature. The physical properties of the resulting samples were characterized by scanning electron microscopy, transmission electron microscope, and X-ray diffraction, respectively. The results show that composite materials, nanosheets-based ZnO–NiO microspheres have been successfully synthesized. For comparison, nanosheets-based ZnO or NiO microspheres were also prepared in the similar method. The nanosheets-based ZnO–NiO microspheres obtained after annealing at 500 °C showed a remarkable composite effect, delivering a higher discharge capacity (733 mAh g−1 at 100 mA g−1 after 50 cycles) and excellent cycling stability in comparison to those of single ZnO or NiO nanosheets. These findings make ZnO–NiO microspheres promising anodes for lithium-ion batteries. The results of this study also offer possibilities of improving the lithium storage capacity of transition metal oxides by controlling both architecture and composition.
KeywordsSnO2 Anode Material Solid Electrolyte Interphase High Discharge Capacity Poor Electrical Conductivity
This work was supported by the Natural Science Foundation of China (Nos. 51201117, 51104121), the China Postdoctoral Science Foundation (Nos. 2012M521481, 2013M540610), and the Scholarship Award for Excellent Doctoral Student granted by Ministry of Education of China (No. 1343-71134001002). Professor Xiaoqing Liu, Wuhan University of Technology, is acknowledged for help in the transmission electron microscopy JEOL 2100F testing.