One-pot synthesis of CoO/C hybrid microspheres as anode materials for lithium-ion batteries |
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Authors: | Hui Qiao Lifen Xiao Zhi Zheng Haowen Liu Falong Jia Lizhi Zhang |
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Affiliation: | 1. Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, People''s Republic of China;2. Institute of Surface Micro and Nano Materials, Xuchang University, Xuchang 461000, People''s Republic of China;3. Key Laboratory of Catalysis and Materials Science of Hubei Province, College of Chemistry and Materials Science, South-Central University for Nationalities, Wuhan 430074, People''s Republic of China |
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Abstract: | We report a one-pot method to synthesize CoO/C hybrid microspheres via a solvothermal approach. The resulting samples were characterized by thermogravimetric analysis, X-ray diffraction, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, transmission electron microscopy and charge–discharge test. X-ray diffraction analysis revealed that the as-prepared samples possessed poor crystalline characteristics and were transformed into crystalline materials after thermal treatment. Field-emission scanning electron microscope images showed that the surfaces of these as-prepared spheres were relatively smooth and of about 2.2 μm in diameter. The diameters of the spheres kept unchanged after being annealed at 800 °C in a high purity nitrogen atmosphere under ambient pressure. The preliminary electrochemical test found that the annealed CoO/C hybrid microspheres exhibited an ultrahigh initial discharge capacity of 1481.4 mAh g−1 in the potential range of 3.0–0.01 V. This value was much higher than that of CoO nanoparticles. Although the capacity of the second discharge cycle decayed to 506.2 mAh g−1, the annealed CoO/C hybrid microspheres anode exhibited very stable reversible capacity at about 345 mAh g−1 only after 10 cycles. This rapid stabilization ability was attributed to the matrix effect of carbon, which may effectively prevent the aggregation of small particles during charging–discharging process. |
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Keywords: | CoO Carbon Hybrid microspheres Solvothermal Lithium-ions batteries |
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