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An understanding of anomalous capacity of nano-sized CoO anode materials for advanced Li-ion battery |
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| Authors: | CH Chen BJ Hwang JS Do JH Weng M Venkateswarlu MY Cheng R Santhanam K Ragavendran JF Lee JM Chen DG Liu |
| Institution: | 1. Nano-Electrochemistry Lab., Department of Chemical Engineering, National Taiwan University of Science and Technology, #43 Keelung Rd., Sec. 4, Taipei 106, Taiwan;2. National Synchrotron Radiation Research Center (NSRRC), Hsinchu, Taiwan;3. Department of Chemical and Materials Engineering, National Chin-Yi University of Technology, Taichung 411, Taiwan;4. Department of Chemical and Materials Engineering, Tunghai University, Taichung 407, Taiwan;5. Solid State and Surface Sciences Lab., Department of Physics, Southern University, Baton Rouge, LA-70808, USA |
| Abstract: | Nanostructured transition metal oxides are of great interest as a new generation of anode materials for high energy density lithium-ion batteries. In this work, research has been focused on the nano-sized (grain size ～7 nm) CoO anode material and this material delivers charge capacity of 900 mAh g?1 that exceeds the theoretical value of 715 mAh g?1. Possible reason for this unaccounted and unexplained anomalous capacity of the nano-sized CoO material has been suggested by thermogravimetric analysis. A mechanism for this interesting behavior has been systematically evaluated by using X-ray absorption spectroscopy. The anomalous capacity is proposed to be associated with the formation of oxygen-rich CoO material. The results obtained from the nano-sized CoO material have been compared with relatively larger-sized material (grain size ～32 nm). |
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